Questions Asked on
December 2, 2010

Physics
The F14 Tomcat lands on aircraft carriers at a speed of 145 mph. The carriers capture system stops the aircraft within 2 seconds. What is the F14's acceleration rate? in m/s^2?
asked by Rose 
math
the short side of an isosceles triangle is 16cm long. by increasing each side length by 24 cm doubles the perimeter.how long are the other sides of the original triangle? ..
asked by Anonymous 
chemistry
a student needs to prepare an aqueous solution of sucrose at a temperature of 20 degrees c with a vapor pressure of 15. 0 mm Hg. How many grams of sucrose (mm=342 g/mol) does she need if she uses 375 g H20? (the vapor pressure of water at 20 degrees c is
asked by meghan 
math
If the mean of a set of 36 scores is 27 and two more scores of 40 and 42 are added, what is the new mean?
asked by Amanda 
Chemistry
Okay I'm doing a lab report, and I need to find the average of two trials. Can someone show me stepbystep how do find the uncertainty for this average: (4.32g+4.17g)/2 =4.25 The values I used and their uncertainties: 4.32g +/ 0.02 4.17g +/ 0.02
asked by L 
Calculus
Approximate the area under the graph of f(x)and above the xaxis using 4 rectangles: f(x)=x(x) +2 using 4 rectangles at intervals 0,5
asked by Rod 
PROBABILITIES
Factories A and B produce computers. Factory A produces 3 times as many computers as factory B. The probability that an item produced by factory A is defective is 0.037 and the probability that an item produced by factory B is defective is 0.05. A computer
asked by cmb 
PROBABILITIES
You ask a neighbor to water a sickly plant while you are on vacation. Without water the plant will die with probability 0.7. With water it will die with probability 0.6. You are 82 % certain the neighbor will remember to water the plant. You come back from
asked by cmb 
chemistry
how many molecules are there in 5 moles of zinc sulfide?
asked by sheri 
chemistry
how many molecules are there in 53 g of CaO ?
asked by sheri 
chemistry
If you have 18 g of Ag2O, how many moles do you have
asked by sheri 
Chemistry
Okay I'm doing a lab report, and I need to find the average of two trials. Can someone show me stepbystep how do find the uncertainty for this average: (4.32g+4.17g)/2 =4.25 The values I used and their uncertainties: 4.32g +/ 0.02 4.17g +/ 0.02
asked by L 
English 227
What are your tips, tricks and help for conducting research?
asked by larry 
organic chemistry
How would i construct a graph of refractive index versus percent 1bromooctane for KI and KCl reactions
asked by Katie 
7th grade
how many millimeters of hcl are in a 60 millitmeter bottle thst is marked 75 percent
asked by Anonymous 
Chemitry
Nitrogen dioxide, NO2, decomposes upon heating to form nitric oxide and oxygen according to the following equation: 2NO2(g)>2NO(g) + O2(g) At the beginning of an experiment, the concentration of nitrogen dioxide in a reaction vessel was 0.1103 mol/L.
asked by Irina 
Chemistry
Explain why CH2ClBr and CH2Cl2 do not have optical, geometric, or structural isomers?
asked by Rachel 
english grammar
She’s liked him since six months. When you start work? I’ve been knowing her for three months i)What the mistake is. ii) Why you think it has been made. iii) How you would explain and correct the mistake with a student.
asked by rahila 
Physics
A circular saw blade rotating at 3600 rpm is braked to a stop in 6 seconds. What is the angular acceleration? How many revolutions did the blade make before coming to a stop?
asked by Anthony 
math
is f(x)=3x7 a one to one function
asked by yesi 
American Literature
I need to provide literature allusion about Hector. and one about Paris, and one about Achilles.I am having a hard time finding similar litature characters to allude to or compare similarities. A quote about any of the three from another liturature source
asked by Kay 
math
what is 13 and 21/20 in simples form ?
asked by araceli 
English
1. I kept myself warm. 2. I kept myself running on the playground. 3. I kept myself hidden in the closet. (Are the sentences all grammatical?)
asked by rfvv 
English
1. Her first book came out in 1902. 2. Her first book was published in 1902. (Are both the same?)
asked by rfvv 
English
Posted by rfvv on Tuesday, November 30, 2010 at 6:05am. 1. I cannot be an actor. 2. I am not an actor at all. 3. I cannot become an actor. (What does #1 mean? Is #1 similar to #2 or #3?) English  Writeacher, Tuesday, November 30, 2010 at 7:06am 1 and 3
asked by rfvv 
English
1. What was her character? 2. What does she look like? 3. What's her personality? 4. What is she like? 5. What is she similar to? She was quiet and shy. (Can all the sentences from #5 to #1 be the suitable questions for the answer?)
asked by rfvv 
English
Look through your paper to find any small mistakes before you submit it. (What is the meanimg of 'paper' in this sentence?)
asked by rfvv 
English
1. She thinks reading books. 2. She thinks of reading books. 3. She thinks about reading books. 4. She thinks that she is reading books. 5. She thinks to be reading books. (Are they all grammatical?)
asked by rfvv 
help me its urgent
Consider the following student errors. After each error, state: i) What the mistake is. ii) Why you think it has been made. iii) How you would explain and correct the mistake with a student. a) I am a secretary for five years. i) ii) iii) b) I have eat
asked by rahila 
word problem
two thirds the bonus points given last week plus the quotient of 6 and the cube root of 8
asked by Anonymous 
physics
A 105N suitcase sits on a rubber ramp at an airport carousel at a 25 degree angle . The weight vector can be broken into two perpendicular components. What is the magnitude of the component parallel to the ramp surface?
asked by Anonymous 
math
At what values of x does the function f(x)= x(x4)^4 have a horizontal tangent line?
asked by Keith 
calculus
At what values of x does the function f(x)= x(x4)^4 have a horizontal tangent line?
asked by Keith 
math
find v for the following question.. the tip of the airplane propeller 3m long, rotating 500 times per minute (hint r=1.5m)
asked by confused 
math
The 2 pulleys in the figure have radii of 15 cm and 8 cm, respectively. The larger pulley rotates 25 times in 36 seconds find the angular velocity of each pulley in radians per second. Find angular velocity of each pulley in radians per second.
asked by confused 
arif
when I tried to find solution of 1/(x3) + 1/(x9) = 1/(x2) + 1/ (x8) all terms of x are cancelled out why? Is there any rule to find solution of this?plz guide me.
asked by aliya 
MATH  PLZ NEED HELP
Jill has 4 pints of water in a 4pint bucket. Jack has an empty 1pint bucket and an empty 3pint bucket. None of the buckets has measurement markings. How can they divide the water so each has exactly 2 pints?
asked by Roni 
Physics
A box slides down a 38.5° ramp with an acceleration of 1.47 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.
asked by Zack 
Math
Use the echelon method to solve the following system: x/5+3y=31 2xy/5=8
asked by Ashley 
algebra
kristyn is 4 yrs younger than mario.three years from now she will be two thirds as old as mario. find the present age
asked by ronie 
math
If you have a bag of jellybeans that can be divided equally among three, five or 13 people, what is the smallest number of jellybeans the bag can contain?
asked by shelby 
physics
Consider a level flight turn of a propellerdriven airplane in which the airplane makes a complete circular turn in 1.6 min. If the plane's speed is 200 m/s, what is the radius of the circle?
asked by kaitlyn 
drawing
suppose you copy a drawing of a polygon with given size factor. How will the side lengths, angle measures, and perimeter of the image compare to those of the original
asked by Anonymous 
algebra 2
identify the graph of the solution set of 8.5>6.1+0.6y
asked by Anonymous 
algebra 2
one number is two less than a second number. If you take onehalf of the first number and increase it by the second number,the result is atleast 41. find the least possible value for the second number.
asked by Anonymous 
Economics
Why does the Average Physical Product curve slope downwards so soon?
asked by luis 
college
a certain radioactive isotope has a half life or 850 years.how many years would it take for a given amount of this isotope to decay to 70% of that amount?
asked by Kiesha 
Chemistry
Calculate the molarity and the molality of an NH3 solution made up of 30 g of NH3 in 70 g of water. The density of the solution is 0.982 g/ml. Molar Mass of NH3 = 17.04 g
asked by Sara 
math
7 yd 5 yd 1 ft 4 in 3 yd 1 ft 2 yd 2 ft 8 in  and 
asked by M.P.L 
statistics
with a mean of 62 and standard deviation of 12, how would you find a proportion greater than 80 and draw it on a curve?
asked by kaitlyn 
math
7 yd  3 yd 1 ft
asked by M.P.L 
math
5yd 1ft 4in  2yd 2ft 8in
asked by M.P.L 
PreCalculus
. Margaret is planning to invest up to $22,000 in certificates of deposit at City Bank and People’s Bank. She wants to invest at least $2,000 but no more than $14,000 at City Bank. People’s Bank does not insure more than a $15,000 investment, so
asked by Bruce 
Intro to Law
I need some help for a mock trial in class. I am supposed to write a direct examination for a man by the name of Farley on the plaintiff. I read on the internet that direct examinations are conducted by the attorney on the witness's side. But I also read
asked by Bella 
biology
Which of the following is NOT a function of hormones? a. initiate behavior and reproduction b. coordinate the production and use of energy c. maintain nutrition and metabolism d. react to stimuli from outside the body B?
asked by Lily 
PreCalc
Amount after time t A (t) = yobt Where: yo = starting amount b = growth constant (percent remaining) t = number of time units It is well known that superman can withstand as much as 3 grams of Green Kryptonite indefinitely. However, exposure to more than 3
asked by Ann 
PRECALC
A drug is eliminated from the body through urine. Suppose that for an initial dose of 10 milligrams, the amount A (t) in the body t hours later is given by A(t) = 10(0.8) t a) Estimate the amount of the drug in the body 8 hours after the initial dose. b)
asked by Ann 
calculus
Find the most general antiderivative of the function 1) f(x)= (X^3)^1/4 + (X^4)^1/3 2) f(u)= U^4 + 3ãU / U^2
asked by beatriz 
PreCalc
Find the standard form of the equation of the ellipse with the following characteristics. foci: (+/5, 0) major axis of length: 22
asked by barb 
His 135
Define the foreign policy of détente.
asked by Tasha 
Chemistry
The solubility of CO2 in water at 25 degrees C and 1 atm is 0.034 mol/L. What is its solubility under atmospheric conditions? (The partial pressure of CO2 in air is 0.0003 atm.) Assume that CO2 obeys Henry's law. My Answer: 1.02 x 10^5 mol/L
asked by Sara 
his
What steps did Nixon take to open foreign relations with China? Why was this an important step in Cold War politics?
asked by Anonymous 
social studies
The goal of America's containment policy was to
asked by joe 
chemistry
is the following false the boiling point of a 0.5 aqueous solution of koh is higher than the boiling point of a 0.5m aqueous solution of kcl?
asked by micki 
english
i need to know if i corrected these two paragraphs properly. i need to know if the sentences flow properly and if there's any errors thank you. 1. A lot of people don’t have wills. Everyone needs a will, but not all people have one. Wills are important
asked by erica p. 
english
tell me what ares related to citing sources do you find confusing or difficult to understand or apply
asked by Anonymous 
Physics
A bicycle wheel of radius .7m is rolling without slipping on a horizontal surface with an angular speed of 2 rev/s when the cyclist begins to uniformly apply the brakes. The bicycle stops in 5s. Through how many revolutions did the wheel turn during the 5s
asked by Kevin 
Physics
A 70 kg man just before contact with the ground has a speed of 5 m/s In a stifflegged landing he comes to a halt in 7ms (miliseconds). Keeping in mind that the average net force acting on the man includes both the force of the ground on the man and the
asked by Kevin 
physics
What is the work formula
asked by Sangram 
math
I am trying to solve using the elimanation x+y=10 and 3xy=6
asked by Brenda 
calculus
A stone is dropped from the upper observation deck (the space deck) of the CN Tower, 450m above the ground. (a) How long does it take the stone to hit the ground? (b) If the stone is thrown downward with a speed of 5m/s, how long does it take to reach the
asked by beatriz 
Chemistry
Convert: 5.72 kJ to kcal
asked by Nikki 
College Chemistry
a 1.00L solution saturated at 25°C with calcium oxalate (CaC2O4) contains 0.0061 g of CaC2O4. The solubility constant (Ksp) for this salt is [CaC2o4= 128.09 g/mol] a) 6x10^ 3 b) 4.6x10^ 8 c) 2.3x10^ 9 d) 1.5x10^4 if you could please work it out for
asked by Shanice 
Math
Solve X=8(mod 11), X=9(mod 12), X=10(mod 13)
asked by Morris 
calculus
A particel is moving with the given data. Find the position of the particle. v(t)= sin t  cos t , s(0)= 0
asked by beatriz 
Math
I am trying to figure how to solve this but I am totally confused? Can someone help explain this to me? y + x = 6 I know the formula to use is y=mx+b but just not to sure how to work the problem out so I can graph this? Have any suggestions for me? Would
asked by Nikol 
Statistics
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 12 hours, with a standard deviation of 3 hours. It is desired to estimate the mean viewing time
asked by Shyra 
algebra
what happened when the crossword puzzle champion died
asked by keana 
Statistics
Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0
asked by Salman 
Maths
Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0
asked by Salman 
Math
Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0
asked by Salman 
Physics
A skater spinning with angular speed of 1.5 rad/s draws in her outstretched arms thereby reducing her moment of inertia by a factor a 3. a) Find her angular speed. b)What is the ratio of her final angular momentum to her initial angular momentum? c)Did her
asked by Tarren 
Stats and Data
Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0
asked by Salman 
physic
An SUV is negotiating a horizontal unbanked turn. The radius of the turn is 20m, the center of gravity of the vehicle is 1m above the ground and in the middle between the left and right side. The seperation of the left and right wheels is 1.8m What is is
asked by Billie 
PreCalculus
It is well known that superman can withstand as much as 3 grams of Green Kryptonite indefinitely. However, exposure to more than 3 grams for more than 13 hours is fatal. Assume that Kryptonite decays at an hourly rate of 5.35% If superman is trapped in a
asked by Ann 
math
What if we don't get anything and we did so good last year is that possible and what happen I really have trouble with that?
asked by May666 
ScienceChemistry
Calculate the number of grams of carbon dioxide that can be absorbed by a complete reaction with a solution that contains 5.00 grams of sodium hydroxide
asked by Kelsey 
chem
a student has to prepare 3 liters of a 1.5 M solution of C6H12 O6. What mass of C6H12O6 does she need?
asked by Desiree 
College math
On a flight with 138 passengers, each passenger had the choice of peanuts or pretzels for a snack and the coice of chicken or beef for dinner. The beverage service offered 12 beverages. A flight attendant later remarked that no 2 passengers had the same
asked by Amy 
Computers
1. There is a requirement to store 750 records. The number of buckets is 10,000. The number of slots per bucket is 3. What is the PPD? 2. Hashing Algorithm Computation The record key is 1234AB6. The number of buckets is as per the PPD computation above in
asked by Jim 
Biology
Please help !!!! two bacteria, "Claire" and "Bob" are infected with a virus. Claire explodes several hours later and Bob lives happily ever after.... until one day when Bob feels stressed out and all the sudden, explodes as well. What happened to bacteria
asked by Ashley 
economics
Why does the Average Physical Product curve slope downwards so soon?
asked by Luis 
Physics
Hello agein, a biger question this time. Height difference H 180 meters Flow T 3000 tons / second Delivery 4.2 GW P a) How large is the efficiency of the plant through the turbines? b) From turbine power plant goes through a cable stretch over a long
asked by Oddbjørn 
mathrates
.....rates....6th garde.....lesson62 5pounds for $2.49
asked by alex 
mathrates
1,680 kilobytes in 4 minutes ..........how do u get it....... lesson 62 ......rates....6th grade pg. 289 ......#2
asked by alex 
Chemistry
If a reaction takes 8 hours at 20 degrees celcius, how long will the reaction take at 50 degrees celcius? (Please answer in # of hours) A formula would be so helpful! thanks!
asked by Marta 
math
Find the area of each figure with the given dimensions Trapeziod: b1 = 6,b2=10, h=5 Trapeziod: b1= 4.5, b2= 8, h=6.7 I wasn't in school the day we studied this, and i am only in 7th grade!
asked by Danielle 
chemistry
The element X has an atomic mass of 12.80 amu. It is known to have two isotopes 12X and 13X. Which of the following is true about the relative abundancies of 12X and 13X? a) both isotopes occur with the same frequency. b)12X occurs more frequently than 13X
asked by Dawn 
MATH HELP PLEASE!!
On a flight with 138 passengers, each passenger had the choice of peanuts or pretzels for a snack and the coice of chicken or beef for dinner. The beverage service offered 12 beverages. A flight attendant later remarked that no 2 passengers had the same
asked by Anonymous 
math
An amount of $5000 is invested at an interest rate of 7% per year, compounded quarterly. Find the value A(t) of the investment after t years.
asked by Iyeisha 
English
Can you please check these sentences for me? Thank you very much. 1)Nature is personified. 2)The humans (or people, human beings) don't have time to observe her beauty as cows an sheep do. 3) We don't have time to turn at Beauty's glance and see how her
asked by Franco 
Chemistry
A 5.0g Sample of KBr at 25.0 degrees celsius dissolves in 25.0 degrees celsius 25.0 mL of water also at 25.0 degrees celsius. The final equilibrium temperature of the resulting soltution is 18.1 degrees celsius. What is the enthalpy of of solution in
asked by Sally 
spanish
What does Contesta sobre un groupe de amigos que van de camping mean?
asked by Jorden 
physics
harry takes a space voyage and returns to find his twin sister has aged more than he has. This is evidence that they have been in different?
asked by joe 
Spanish 2
What does contesta sobre un grupo de amigos que van de camping mean?
asked by Jorden 
Physics
What force is required to accelerate an object having a mass of 3 kg at 5 m/s2?
asked by Erica 
Macro economics
if your agency hire a consultant to develop new software programs to lease at a constant cost of $ 1000 per year. the consultant say you can save $ 200 per year for every computer you purchase but you will be charged $ 100 for each harddrive you purchase .
asked by Lisa 
10th grade
change 114/8 to a mixed fraction in simplest form
asked by lenny 
chemistry
From the following information, determine ΔH°f of malonic acid, CH2(COOH)2(s). CH2(COOH)2(s) + 2O2(g) → 3CO2(g) + 2H2O(l); ΔH° = –861.0 kJ Substance ΔH°f (kJ/mol) CO2(g) –393.5 H2O(l) –285.8 A. 2613.1 kJ B. –1540.3 kJ C. –2613.1 kJ D.
asked by Jake 
math
11 3 1/2
asked by key 
math
Is every square a rectangle? Is every rectangle a square?
asked by Manasa 
chem
3.98mL of 2.902M HCL are reacted with 15mL of 3.198 M NaOH. Use molar heat of neutralization to determine the kJ of heat produced. molar heat of neutralization is 55.84kJ/mol.
asked by Anonymous 
Computers
1. There is a requirement to store 750 records. The number of buckets is 10,000. The number of slots per bucket is 3. What is the PPD? 2. Hashing Algorithm Computation The record key is 1234AB6. The number of buckets is as per the PPD computation above in
asked by Jim 
11th grade
so I have this problem and I don't know what numbers to multiple and whatnot. Can someone help me? This is the problem: 4000 g Fe2O3* 1mole Fe2O3/159.68 gFe2O3* 3mole CO2/1mole Fe2O3
asked by Jessi 
history
Explain Nixon’s strategy of ending the Vietnam War using “peace with honor?”
asked by Anonymous 
physcience
determine the mass in grams 1.3mol of silver,Ag
asked by diamond 
physics
A bird is flying from the ground to the top of a tree at 5 m/s at an angle of 24 degrees. What are the horizontal and vertical components of this velocity?
asked by Anonymous 
college chemistry
Consider the following metals. Metal Specific Heat copper 0.385 J/(g · °C) magnesium 1.02 J/(g · °C) mercury 0.138 J/(g · °C) silver 0.237 J/(g · °C) lead 0.129 J/(g · °C) If the same amount of heat is added to 25.0 g of each of the metals, which
asked by Jake 
chemistry
One reaction of iron with hydrochloric acid is represented by the following thermochemical equation. Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g); ΔH°= –87.9 kJ How much heat is liberated at constant pressure if 0.416 g of iron reacts with 42.0 mL of 0.457 M
asked by Jake 
5th grade math word problem
Santa was making up a batch of dolls but could not remember exactly how many of each kind he needed. He knew that he needed 57 in total that 27 had to have blue eyes and 29 had to have fair hair. Also some had to have both features and 3 dolls were needed
asked by tryston 
12th grade
A farmer has 100 yards of fencing to form two identical rectangular pens and a third pen that is twice as long as the other two pens, as shown in the diagram to the right. All three pens have the same width, x. Which value of y produces the maximum total
asked by Richard Steele 
physics
What would be the resulting acceleration if a 7.0 kg shot put was launched with a force of 140 N?
asked by Stella 
english
write two paragraph explaining the changes that you would make to revise the paper.
asked by susan 
Chemistry
Which substance is a conductor of electricity ? (1)NaCl(s) (2)NaCl (l) (3)C6H12O6(s) (4) C6H12O6 (l) thanks for any help !
asked by Anonymous 
Chemistry
Which compound contains both ionic and covalent bonds? (1)HBr (2)CBr4 (3)NaBr (4)NaOH
asked by Anonymous 
Geography
Choose the geographic theme represented below. Paraguay is a landlocked nation. It is bordered by Bolivia, Brazil, and Argentina. a.location b.humanenvironmental interaction c.movement d.regions please help me!
asked by ... 
Chemistry
Hydrogen bonding is strongest between molecules of (1)H2S (2)H20 (3)H2Se (4)H2Te
asked by tina 
Geography
for a graphic organizer about the mixed wood plains ecozone, what would the "why" and "how" parts be ?
asked by Tannah 
MATH
HOW MANY DIFFERENT WAYS COULD THE FOOTBALL TEAM SCORE 11 POINTS
asked by lISA 
Physics
A 100g aluminum calorimeter contains a mixture of 40 g of ice and 200 g of water at equilibrium. A copper cylinder of mass 300 g is heated to 350 C and then dropped into the calorimeter. What is the final temperature of the calorimeter and its contents if
asked by Calvin 
chem 121
H3PO4 is it phospheric acid or trihydrogenphosphate?
asked by ngugi 
advanced math
a=x+B+C/DFG2*gh/32 solve for b please help???
asked by Taylor 
algebra
whom should to see at the bank if you need to borrow money?
asked by mercedes 
Emglish
Can you help me check these sentences,please? Thank you. 1)Briefly outline the main features of Wordsworth's poetry as stated in his "Preface to the Second Edition of Lyrical Ballads". 2)Answer three out of the following four questions. For each question
asked by Franco 
bus. calculus
: intervals of increase and decrease for f(x)=(x3)(x^26x3)
asked by leighton 
Chemistry
A covalent bond forms when (1)two nuclei share electrons in order to achieve a complete octet of electrons (2) atoms form ions and then electrostatic forces of attraction bond the ions together. (3)repulsive forces between atoms are greater than the
asked by Jazmin 
spanish 2
escribe 10 frases completas usado mandators familiares afirmatives
asked by google 
Business Law
Many organizations have established policies to remedy discrimination in hiring of women and minorities. * Discuss whether or not you feel that affirmative action programs, reverse discrimination, and criteria of comparable worth are appropriate forms of
asked by Tony 
Social Studies
What are the 5 sources of power?
asked by Whitney 
science
WHAT IS 1 IMMOVIBLE JOINT?
asked by LUCY 
Geography
Which items are described by the geographic theme of place? a.Australia's climate is varied; it ranges from arid to tropical. b.Australia's population is mostly Englishspeaking. c.Australia is an island nation surrounded by the Indian and Pacific Oceans.
asked by ... 
physics
A 73 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 15° above the horizontal. (a) If the coefficient of static friction is 0.52, what minimum force magnitude is required from the rope to start the crate moving?
asked by vm 
Chemistry College
One reaction of iron with hydrochloric acid is represented by the following thermochemical equation. Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g); ΔH°= –87.9 kJ How much heat is liberated at constant pressure if 0.416 g of iron reacts with 42.0 mL of 0.457 M
asked by Julia 
chemistry
How do I determine the type of radiation that has a wavelength of 4.2 nm?
asked by Michele Lachner 
6th grade
Scientists have calculated that the Moon's revolution around Earth is increasing by about .015 s per century. At this rate, how long would it take the length of a month to increase by one full day?
asked by Sylvie 
RES342
A normal distribution has a mean of 50 and a standard deviation of 4. Determine the value below which 95% of the observations will occur.
asked by Aimee 
RES342
A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds. What is the best estimate of the population mean? a. X=60.00 b. X=0 c. X=50.00 d. X=none of the above
asked by Aimee 
algebra
Mr. Miller says, Plan on a quarter pound of hamburger per person." There are 21 people in the class, including Mr. Miller and us." How much money should be collected for the cost of each burger in each student? if Hamburger Meat: $1.49 per pound ( limit: 5
asked by regina 
RES342
A normal distribution has a mean of 80 and a standard deviation of 14. Compute the probability of a value between 75.0 and 90.0. a) .2022 b) .3595 c) .4017 d) None of the above
asked by Aimee 
RES342
Using Problem #4, what is the probability the amount requested is between $65,000 and $80,000? a. .4500 b. .2902 c. .5987 d. None of the above
asked by Aimee 
12th grade
Angle elevation of sun is 25 degrees. Find the length the shadow cast by a tree 41 feet tall.
asked by Ro 
Math HELP
There is a triangle inside of a circle. I have to find area of the shaded region which is the circle. So i would have to substract the area of the triangle from the area of the circle. the radius of the circle is 3 inches. I found the area of the
asked by MK 
RES342
In 1000 samples, assuming that the null hypothesis is true, how many times would you expect to commit Type I error if alpha=.05? a. 95 times b. 10 times c. 50 times d. Not enough information given to provide an answer
asked by Aimee 
physics
A 4.5 kg bag of groceries is in equilibrium on an incline of angle θ = 55°. Find the normal force of the incline on the bag.
asked by Kevin 
HISTORY
what is the official currency of the united states?
asked by ali 
Pre cal Trig
2cos^2x=cosx. Can you subtract the cos from cos^2? Or what would i have to do?
asked by Jessica 
history
if both the president and the vice president die who assumes power?
asked by sadi 
Chemistry
1. Which element forms bonds with a sea of mobile electrons? a) Ca b) C c) Ar d) He
asked by Anonymous 
Chem
How many orbitals have the values n_3(n sub 3) n_3=4 and l_3(l subscript 3) l_3=3 ? How many orbitals have the values n=4, l=3, and m_l=2? I tried 2 for this one but that is not the correct answer. Could you please help I do not know how to figure out
asked by Kay 
physics
A 85.0 N grocery cart is pushed 13.0 m along an aisle by a shopper who exerts a constant horizontal force of 40.0 N. If all frictional forces are neglected and the cart starts from rest, what is the grocery cart's final speed
asked by Bailey 
Chemistry
1. Which element forms bonds with a sea of mobile electrons? a) Ca b) C c) Ar d) He
asked by catherine 
Math
Find altitude of isosceles triangle if è=53 degrees (the equal angles) and the base is 8 inches.
asked by Ro 
Fractions
My denominator is 6 more than my numerator. My simplest form is 2/5 What fraction am I?_______
asked by Alex 
Earth Science
Describe how Earth would be different today if it contained no radioactive material. What would the consequences be for the Earth’s interior layers?
asked by Jack 
English
Thank you very much for your corrections. Here are some more sentences I need to check.Thank you. 1)The Renaissance derived from the medieval background a general conception of order. The universal order was conceived in the forms of a chain of being and a
asked by Franco 
Chemistry
2. Which bond is polar covalent? a) H2 b) Cl2 c) HCl d) O2
asked by Lisa 
algebra
I just started learning functions and how to graph them.. but I don't know how to do this problem? x + y = 0. I wasn't sure so I put "No Solution"
asked by Michelle 
physical science with earth science
Write a balanced chemical equation for the reaction for propane C3H8 burning in oxygen to for carbon dioxide and water vapor
asked by abby 
chemistry
how do i do this: give the number of protons, electrons, and neutrons in each of the following atoms. 108 47 Au 40 20 Ca 23 11 Na
asked by monique n 
math
a student said that all squares are rectangles, but not all squares are rhombuses.What was the error??
asked by Katherine 
business law
Select a dispute that arises in a business or commercial situation. a. What ADR process would be best suited to resolve this dispute? Explain why. b. What processes would not be suitable? Why not? Avoid selecting a dispute mentioned by other students.
asked by susan 
Microeconomincs
Why does the Average Physical Product curve slope downwards?
asked by sammi 
math
why is it possible to find the sum of the angle meanures of an ngon using the formula (180n360)??
asked by evelyn 
physics
An 70.0 N box of clothes is pulled 24.0 m up a 30.0° ramp by a force of 115 N that points along the ramp. If the coefficient of kinetic friction between the box and ramp is 0.22, calculate the change in the box's kinetic energy.
asked by Bailey 
Chemistry
Which compound is most polar in nature? a) CO2 b) H2O c) F2 d) NaCl
asked by Carlos 
math
use properties of parallel lines to explain which angles in a parallelogram must be congruent???
asked by lesly 
Algebra
Solve by the elimination process: 0.3x  0.2y = 4; 0.2x + 0.3y = 5/23
asked by Jessica 
math
how do u make a rectangle with 8 tiles?
asked by cindy 
Chemistry
If a sample of 23.0 L of NH3 gas at 10 degrees C is heated at constant pressure until it fills a volume of 50.0 L. What is the new temperature in degrees C?
asked by Nana 
edu 310
What are the career possibilities in the education world.
asked by Anonymous 
history
How did professionalization meet the needs of the developing American economy In the urban life?
asked by Tiffany 
Chem 22
balance molecular formula, total ionic formula and net ionic formula of Sr(NO3)2 + Al2(SO4)3. Thank you
asked by Ivy 
Chem 22
balance molecular formula, total ionic formula and net ionic formula of Sr(NO3)2 + Al2(SO4)3. Thank you
asked by Ivy 
Physics
a boy sledding down a hill accelerates at 2.4 miles per second squared. if he starts from rest, in what distance would he reach a speed of 8.0 miles per second?
asked by Cecilia 
Math
how do you do these problems?? 526 22/9 82/3 4/3+6 But I can do these types pf problems ( don't need help with problems below) 3/4 + 1/10 and 5/6  1/4 Please Help!! Thanks!!!
asked by Erin 
English
I forgot to include the following statements. Thank you very much. 1)Mary I (the daughter of Henry VIII and Catherine of Aragon) repealed anticatholic legislation and reintroduced the catholic religion. 2)Elizabeth I’s (Henry VIII and Anne Boleyn’s
asked by Franco 
Chemistry
How can you determine if a covalent bond is polar or nonpolar? Give an example of each. thanks !
asked by Carlos 
language arts
How are russell baker and snowflake bentley alike and different?
asked by john 
English
1. You have to study hard. 2. You don't have to study hard. 3. You have not to study hard. (Is #2 the same as #3?)
asked by rfvv 
history
How did the settlement house movement differ from earlier attempts to relieve poverty?
asked by Tiffany 
physics
Approximate the gravitational force of attraction between a 42.0 kg girl and a 56.0 kg boy if they are sitting 3.0 m apart in physics class.
asked by Devon 
Math
1. The problem asks:If Aaron has saved 36 sand dollars and wants to give them away equally to "p" friends, write an expression to show how many sand dollars each of Aaron's freinds will receive?(For better umderstandin may you show the correct expression
asked by Niylah 
English: ShakespeareOthello
i need help please. idont understand this question. as he enter desdemona's bedchamber in order to kill her, othello mutters: it is the cause, it is the cause, my soul. what is he talking about? in what way might he be rationalizing Desdemona's murder?
asked by Need Help 
math
1. Classify 4 as rational,irrational,not areal number or neither?
asked by Kieosha 
algebra
Steve's mon's age is 7 years less than 3 times Steve's age. The sum of their ages is 65 years. Find their ages.
asked by shelby 
Geometry
/Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?
asked by Jake 
Math Help please!!
how do you do these problems?? 526 22/9 82/3 4/3+6 But I can do these types pf problems ( don't need help with problems below) 3/4 + 1/10 and 5/6  1/4 Please Help!! Thanks!!!
asked by Erin 
physics
When empty, a particular helicopter of mass 3770 kg can accelerate straight upward at a maximum acceleration of 1.36 m/s2. A careless crewman overloads the helicopter so that it is just unable to lift off. What is the mass of the cargo?
asked by skhan 
Math
{Hello everyone i'm back}:) I have a problem..: Kevin has 5 containers of chocolate. The first container has 110 peices of chocolate, the third container has twice as many peices of chocolate as the second container and the fourth container has half as
asked by Sherkyra8456 
trig
Find altitude of isosceles triangle if angle=53 degrees (the equal angles) and the base is 8 inches.
asked by Ro 
Math
If 2x+3=7 and 3x+1=5+y, the value of y is: A. 1 B. 0 C.10 D.10 ????
asked by Tiara 
Geometry
/Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?
asked by Jake 
math
a student said that all squares are rectangles, but not all squares are rhombuses.What was the error??
asked by Katherine 
math
hy is it possible to find the sum of the angle meanures of an ngon using the formula (180n360)??
asked by Evelyn 
Geometry Please Help
/Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?
asked by Jake 
math
use properties of parallel lines to explain which angles in a parallelogram must be congruent???
asked by lesly 
Geometry Please Help
/Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?
asked by Jake 
++Math++
Cumulus clouds have flat bases and lumpy tops. The tops are usually 1 mile above sea level. To find the height in feet of the base of a cumulus cloud, you can use the formula: height = 222 (air temperature  dewpoint temperature). The air and dewpoint
asked by Eric 
Math
Julio is testing a hypothesis than "n" stalks of corn planted together will produce(2n[second power symbolthe little 2 at the top]2n)ears of corn. If Julio plants 6 corn plants, how many ears of corn does Julio expect to harvest?
asked by Tiara 
economics
Read the Case Exercise Cost Analysis (pp. 327328 of the Textbook)  Answer the following questions: 1. Calculate the incremental, or marginal, cost per chair to Leisure Products of accepting the order from Southeast? 2. What assumptions did you make in
asked by Anonymous 
Math
Sam rows up a river to camp in 3 hours. The next day he makes the return trip downstream in 1 hour. If he can row 2 mph in still water, how fast is the current?
asked by Sherkyra8456 
algebra
pencils are sold in packages of 5. explain why you need 6 packages in order to have enough for 27 students
asked by olive 
Math
input (f) 5,10,2,8 Output f(x) 22,47,7,37 My question is what is the rule?
asked by Haley 
Algebra
Each ordered pair is a solution of a direct variation. Write the equation of direct variation. (2,10) (8,2) (7,21) (2,16) Please Help!
asked by Caitlyn 
math
516/3=
asked by Paul 
Math
Given any random, 3digit number, what is the probability that a number will be: a) a multiple of 5 b) a multiple of 2 c) a square number How?
asked by Tiara 
physics
A 2.2 kg purse is dropped from 55 m above before reaching the ground with a velocity of 25 m/s. What was the average air resistance.
asked by joe 
Math
Solve: 3(xy+2y)=
asked by Tiara 
Math
Can 4:3 be a ratio?
asked by Tiara 
math
if you arrange these items into equal rows tell how many will be in each row and how many will be left over, here it is 17 ballons into 7 rows
asked by olive 
Math
Write in a standard notation: eighteen thousand and two hundredths
asked by Sherkyra8456 
math
17 ballons into 7 rows .................... tell how many will be in each row and how many will be left over?
asked by olive 
math
use properties of parallel lines to explain which angles in a parallelogram must be congruent???
asked by lesly 
Math
There are 2 opaque bags, each containing red and yellow blocks. Bag 1 contains 3 red blocks and 5 yellow. Bag 2 contains 5 red and 15 yellow. To play the game, you pick a bag and then you pick a block out of the bag without looking. Would a person be more
asked by Michelle 
music
need help in describing a piece of music or a song.
asked by Sonia 
Math
A bakery makes 4 different kids of cake. Each cake can have 3 different kinds of frosting. Each frosted cake can be decorated in 2 different ways. How many ways are there of ordering a decorated, frosted cake?
asked by Dillard 
Algebra
Terence wants to estimate the height of a tree. He places a mirror on level ground, as shown in the picture below, and stands so that he can see the top of the tree in the mirror. Since light bounces off the mirror at the same angle at which it strikes the
asked by T 
Math
A children's game has a spinner that is equally likely to land on any 1 of 4 colors: red, blue, yellow, or green. Determine the probability of spinning a red both times on 2 spins. Explain your reasoning.
asked by anonymous 
math
5x3y=11 4x7y=18
asked by Q 
Math
There are 4 black marbles and 5 red marbles in a bag. If you reach in and randomly select 2 marbles, what is the probability that both are red? Explain your reasoning.
asked by anonymous 
math
y = x +b
asked by Anonymous 
Help
Fibrin is produced when the blood components called what start chain reaction
asked by Please 
physics
how much energy does a 200kg have when it's moving at 3 m/s?
asked by mercy 
6th grade
if james spends 5/6 of his weekly allowance seeing a movie he has how much of his allowance left
asked by alex 
Chemistry
Flask A contains 500 mL of water at 25 degrees Celsius and flask B contains 250 mL of water at 50 degrees Celsius. Which flask has a higher heat content? Explain your choice.
asked by Laura 
Math
1. Write 6.34 x 10 to the third power in a standard form. 2. Secondly, Find the amount of rain the state of North Carliona receives each year? About how much rain falls per month? How does North Carliona's monthly rainfall compare with the monthly rainfall
asked by Kim248Jackson 
physical scenic
calculate the potential energy of 30kg box raised 2 meters above ground?
asked by mercy 
geometry
Is it possible to have a quadrilateral with sides of length 10, 5, 1, and 8?
asked by Anonymous 
Math
Ceramic tiles measure 2 inches by 3 inches. What is the least number of tiles that are needed to completely cover a square area that is 2 feet on each side?
asked by Kieosha 
physics
Why can't you hit a feather in midair with a force of 200 N?
asked by suzanne 
Chemistry
Use the data given to calculate the value of delta G rxn for the reaction at 25C 2C(graphite)+H2(g)>C2H2(g) C H2 C2H2 S(J K^1 mol^1) 5.74 130.68 201.0  delta H(kJ/mol)  0  0 226.8 a.291.4 kj b.244.3 Kj c.226.8 kj d.207.6
asked by Liliy 
geometry
what is a set of ordered pairs that, when connected in a specific sequence, will create a convex hexagon.
asked by Anonymous 
physics
A skater spinning with angular speed of 1.5 rad/s draws in her outstretched arms thereby reducing her moment of inertia by a factor a 3. a) Find her final angular speed. b)What is the ratio of her final angular momentum to her initial angular momentum? c)
asked by Kevin 
natural sciences
Which one of the disciplines includes anthropology and education?
asked by malik 
natural sciences
Which one of the disciplines includes anthropology and education? Humanities Natural sciences Social sciences More than one of the disciplines listed here.
asked by malik 
marketing
is 14pound bag of sugar is consumer or b2b good
asked by gurshrankullar 
chemistry
name each isotope, and write it in symbolic notation atomic number 26; mass number 56 atomic number 29; mass number 64 atomic number 17; mass number 37
asked by monique n 
Calc
Use implicit differentiation to find dy/dx. ln xy + 5x = 30
asked by Erica 
Math
why is it possible to find the sum of the angle measures of an ngon using the formula (180n360) *degrees*
asked by Amanda 
Math
/Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?
asked by Aaron 
science
wha t is the scrabled word , P T T O N A D S A I A
asked by olive 
Calc
Locate any relative extrema and inflection points. y = (ln x)/x
asked by Erica 
7th grade
2.4 X 10 to the 4th in standard form
asked by Chase 
Calc
Use logarithmic differentiation to find dy/dx. y = sq. root [(x^2  1)/(x^2 + 1)]
asked by Rebecca 
trigonometry
equation of circle passing through P(10,3), Q(11,8), and R(7,14).
asked by david 
physics
There are two forces acting on a box of golf balls, F1 and F2. The mass of the box is 0.750 kg. When the forces act in the same direction, they cause an acceleration of 0.450 m/s2. When they oppose one another, the box accelerates at 0.240 m/s2 in the
asked by skhan 
Calculus 1
Find the critical numbers of the function. f(x) = x^4*e^8x
asked by Tina P 
Natural Sciences
Which one of the disciplines listed here includes case studies and synthses as types of assignments? Humanities More than one of the disciplines listed here Social sciences Natural sciences
asked by malik 
PLEASE HELP/ALGEBRA
Solve by the elimination process: 0.3x  0.2y = 4; 0.2x + 0.3y = 5/23
asked by Jessica 
chemistry
55 25Mn can be prepared by electron capture from: (a) 55/24Cr (b) 55/26Fe (c) 56/25Mn (d) 51/23V (e) 56/26Fe
asked by bobjahng2 
Natural Sciences
Which one of the disciplines listed here includes direct observations as primary sources? Humanities More than one of the disciplines listed here Social sciences Natural sciences
asked by malik 
more gerunds (language)
The directions ask me to identify the gerund phrase. A loud knocking interrupted their dinner. Would the phrase be a loud knocking and is it used as a subject?
asked by michael 
science
how does density affect the movement of ocean water?
asked by majenta 
Natural Sciences
Which one of the disciplines listed here includes essays and response statements as types of assignments? Humanities Natural Sciences Social Sciences More than one of the disciplines listed here
asked by malik 
gerunds
Love is caring, and I always try to show I care. Caring is the gerund and is it used as a predicate noun? I was thinking it could also be a DO, but i'm not sure if it renames love?
asked by michael 
Ap Euro History
What is the Relative Success in Achieving Catholic/Protestant Aims when the catholics posted the 95 theses?
asked by cody 
Natural Sciences
Which one of the disciplines listed here includes experiments as primary sources? Humanities More than one of the disciplines listed here Natural Sciences Social Sciences
asked by malik 
chemistry
how many protons, electrons, and neutrons are in the following isotopes. uranium235 hydrogen3 silicon29
asked by monique n 
Natural Sciences
Which one of the disciplines listed here includes journal articles as secondary sources? Natural Sciences Social Sciences Humanities More than one disciplines listed here
asked by malik 
Chemisty
PLEASEHELP i am having a major difficulty finding the answer to this question Give the balanced equation with states for both the cathode and the anode reactions of the electrochemical cell shown. Be sure to include electrons in your equations. Pt(s) l
asked by Raffi 
5th grade
If tickets are $.50 for children $2.00 men $3.00 women Explain how 100 people can purchase tickets for $100. No money left over and at least 1 man, 1 woman, and 1 child included
asked by Hayley 
science
unscrable the word P T T O N A D S A I A
asked by olive 
Physics
It has been suggested that rotating cylinders about 10 mi long and 5.4 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the freefall
asked by Lou 
Maths
Is 9997 a prime number
asked by Jim 
Precalculus
How do I solve this? 1  4sin^2(x)cos^2(x) = cos^2(2x)
asked by Christina 
PreCalculus
I want to learn how to find the domain, holes, xintercepts, y intercepts, vertical asymptotes, and horizontal asymptotes of a rational function. I know it is against the rules in jiskha to do the homework for the students but if I have been looking over
asked by Pablo 
chemistry
Calculate the mass of 2.56*10^24 formula units of aluminum dichromate.
asked by jen 
Physics: Fluids
A sample of an unknown material weighs 260 N in air and 175 N when immersed in alcohol of specific gravity 0.700.
asked by B.Ha 
physics
If you throw a cigarette out a car window that is moving at 10 mph where will it land
asked by evie 
physics
If you throw a cigarette out a car window that is moving at 10 mph where will it land
asked by evie 
Science grd 9
The estimated average energy that I used to operate a cloths dryer for a year is is kW•h. If the average rate to operate the dryer is 7.15 cents/kW•h, what is the average cost per year.
asked by Gagan 
Science grd 9
Calculate the cost of watching TV for 5 h at night at a rate of 8.8 cents/kW•h. The TV has a power rating of 180W. Please show work
asked by Gagan 
PreAlgebra
I need help with scientific notation...please help
asked by Ao 
physics
A 0.70 kg ball is moving horizontally with a speed of 8.8 m/s when it strikes a vertical wall. The ball rebounds with a speed of 3.7 m/s. What is the magnitude of the change in linear momentum of the ball? I am not sure how to honestly to figure this one
asked by sam 
physics
A 0.70 kg ball is moving horizontally with a speed of 8.8 m/s when it strikes a vertical wall. The ball rebounds with a speed of 3.7 m/s. What is the magnitude of the change in linear momentum of the ball? I am not sure how to honestly to figure this one
asked by sam 
Physics
A 0.70 kg mass at the end of a spring vibrates 4.0 times per second with an amplitude of 0.15 m. Determine the velocity when it passes the equilibrium point. Determine the velocity when it is 0.11 from equilibrium. Determine the total energy of the system.
asked by Eden 
Science grd 9
Determine which appliance uses the most electrical energy: a clothes dryer that operates for 30 min/day or a freezer that operates for 24h/day. Please show work
asked by Gagan 
5th grade
the lengths of two sides of a triangle are 15in.each.the third side measures 10 in.what type of triangle is this
asked by Anonymous 
Precal
A hotair balloon, headed due east at an average speed of v = 14 miles per hour and at a constant altitude of h = 120 feet, passes over an intersection (see the figure). Find an expression for its distance d (measured in feet) from the intersection t
asked by Nicholas 
Math
/Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?
asked by Aaron 
Science
Does anyone know why magnet have an affect on plant's growth?
asked by Shadow 
French
can you please translate this? cut peahes remove pits Get a dessert dish place peahes in them get vanilla yogurt place about one fourth in each half check up on your melba sauce get melba sauce top with melba sauce make sure it is not too hot serve
asked by Nona 
12th grade
Find altitude of isosceles triangle if angle=53 degrees and base is 8 inches.
asked by Ro 
phy
What mass of steam at 100°C must be added to 1.00 kg of ice at 0°C to yield liquid water at 15°C?
asked by ami 
physics
100 g mass is attached to a string 75 cm long. swings in a horizontal circle. The mass goes around its path once every 0.8. seconds. What is centripetal acceleration of the object? What is the tension in the string?
asked by chelsie 
science
how does density affect the movement of ocean water?
asked by majenta 
phy
A cube of ice is taken from the freezer at 7.5°C and placed in a 101 g aluminum calorimeter filled with 282 g of water at room temperature of 20°C. The final situation is observed to be all water at 16°C. What was the mass of the ice cube?
asked by ami 
physics
Henry drives off a 200m high cliff at 132m/s.How far out,how far down,and how far all together did he travel in 2.6seconds
asked by brad 
science
what's humidity ?
asked by tamia 
chemistry
A 1L flask is filled with 1.45 g of argon at 25 degrees C. A sample of ethane vapor is added to the same flask until the total pressure is 1.35 atm. What is the partial pressure of argon in the flask?
asked by Liz 
Math
Find the sum 1/4 + 1.5 + 2 3/4 + 2.4 + 1 1/2
asked by Cindy 
Algebra
How many possible 9digit zip codes are possible if the first digit cannot be zero?
asked by mychelle 
organic chemistry
Show the reaction equation and mechanisms of a mixture of napthalene,pnitroaniline and benzoic acid dissolved in dichloromethane?
asked by Agnes 
organic chemistry
Show the reaction equation and mechanisms of a mixture of napthalene,pnitroaniline and benzoic acid dissolved in dichloromethane?
asked by Agnes 
math
How many 2 inch squares can be placed completly on a rectangular board that is 12 inchea wide and 16 inches long?
asked by Lina 
Algebra
Find the value of x such that the fourdigit number x15x is divisible by 18.
asked by tyler 
Pre cal
find the value of cotè given secè=5/4 and cscè
asked by AC 
Algebra
What is the largest perfect square that divides 64,800?
asked by tyler 
chemistry
how many more neutrons does thorium230 have then protons? how many electrons does thorium230 have?
asked by monique n 
Algebra
What numeral is in the 100th decimal place in the decimal representation of 6/7?
asked by Shane 
Math
Would you rather take an exam that typically has an mean of 80 with a standard deviation of 3 or an exam with a mean of 80 with a standard deviation of 15? why?
asked by Rena 
chemistry
show that the mass number and the number of protons are conserved in the following nuclear equation: 234 230 4 92 U> 90 th + 2 he
asked by monique n 
algebra
Solve for x: (1/3)(4+3x)=1/2
asked by Sara 
Algebra
/Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?
asked by Sam 
Physics
A ski gondola is connected to the top of a hill by a steel cable of length 720 m and diameter 1.3 cm. As the gondola comes to the end of its run, it bumps into the terminal and sends a wave pulse along the cable. It is observed that it took 14 s for the
asked by Eden 
Physics
The intensity of an earthquake wave passing through the Earth is measured to be 2.5×106 J/m^2 at a distance of 48 km from the source. What was its intensity when it passed a point only 2.0 km from the source? At what rate did energy pass through an area
asked by Jake 
Related Rates
A ladder 10 ft long rests against a vertical wall. If the bottom of the ladder slides away from the wall at a rate of 2 ft/s, how fast is the angle between the ladder and the ground changing when the bottom of the ladder is 5 ft from the wall? Evaluate
asked by Michael 
Math
A bolt weights about 2/5 ounce. True or false The expression 48 divided by 2/5 could be used to find the number of bolts in a 3pound box
asked by Ash 
Chemistry
Which bond is polar covalent? a) H2 b) Cl2 c) HCl d) O2 is it HCL ?
asked by Anonymous 
biology
what are the characteristics that link plants with green algae??
asked by milly 
Precalculus
I've tried many times to get the equation to balance using trig identities like halfangle formulas, powerreducing formulas, and double angle formulas, but I couldn't get the equation to equal out. I only need to work one side to make it equal to the
asked by Christina 
Science
My mother in law falls from a 200m cliff. Answer the following. a. What is her acceleration after 2 seconds? What is her acceleration after 3 sec? b. How long will it take her to hit the ground? c. What would be her velocity right before she hit the
asked by Robbi 
Physics
A 55 kg skier is at the top of a slope that is 10.0 m high. a) Set the zero level for gravitational potential energy at the bottom of the slope and find the gravitational potential energy for the skier at the top and the bottom of the slope. What is the PE
asked by Daniel Reinsnes 
Chemistry
Which compound is most polar in nature? a) CO2 b) H2O c) F2 d) NaCl i think its NaCl. am i right ?
asked by Anonymous 
Chemistry
A 15.0% (by mass) NaCl solution is available.. Determine what mass of solution should be used to obtain a. 2.50 mole of NaCl b. 25.0 g/mol of NaCl
asked by Tim 
9th grade geometry
If two angles are alternate exteriors and one of them has the measure of 3x squared, and the other had a measure of 21x what are degree numbers
asked by Anonymous 
Cultural Diversity
what is the best way to enplain orientalism and the characteristics of it?
asked by Lacey 
Math
A tree casts a shadow 10 feet long. A 6ft. man casts a shadow 4 ft. long. The triangle formed by the tree and its shadow is similar to the triangle formed by the man and his shadow. How tall is the tree?
asked by Caitlin 
health HCA/210
I have a 10 to 12 powerpoint slide due next week and I just wanted to get started on it. I need to explain where health insurance began, the purpose of health insurance, and I have to list the advantages and disadvantages to HMOs, Managed care, PPOs, POS,
asked by Laurie 
MATH
A CIRCULAR COFFEE TABLE HAS A DIAMETER IF 5FT. WHAT WILL THE COST BE TO BE REFINISHED IF THE COMPANY CHARGES $3.00 PER SQUARE FOOT? A+=+pi%2Ar%5E2 r+=+2.5 A+=+pi%2A2.5%5E2 A+=+pi%2A6.25 A+=+19.635 ft2 If cost = C C+=+3%2A19.635 C = $58.90 answer
asked by TANGIE 
college chemistry
The voltaic cell described by the balanced chemical reaction has a standard emf of 4.05 V. Calculate the equilibrium constant (Kc) for the reaction at 25 oC. Round your answer to 3 significant figures. F2(g) + Mn(s) → 2F(aq) + Mn2+(aq) Mn2+/Mn 1.18
asked by sparkle 
Implicit Differentation
Find the slope of the tangent line to the curve at (2,1). x/y +x^2y^2=6
asked by Michael 
Chemistry
Explain with reference to the Nernst equation, how is it possible for a cell to have a positive cell potential understandard conditions but the negative cell potential under other conditions.
asked by Liliy 
Chemistry Cell notations
Enter the balanced chemical equation including states that describes the electrochemical cell that is represented by the cell notation as shown. Pt(s) l H2O(l) l O2(g) l H+(aq) ll H+(aq), Cr2O72(aq), Cr3+(aq) l Pt(s)
asked by Confused 
Chemistry
is the lewis dot structure and a electron dot diagram the same thing ?
asked by Anonymous 
US history
What impact did black voters have on the Populist Party? What impact did the Populist Party ultimately have on their black constituents?
asked by anthony 
Calc
A wire 100 inches long is to be cut into two pieces. One of the pieces will be bent into the shape of a circle and the other into the shape of a equilateral triangle. How should the wire be cut so as to maximize the sum of the area of the areas of the
asked by Matt 
chemistry
apply quantum theory to explain the photoelectric effect
asked by Anonymous 
5th grade math
If you have 78.1% nitrogen,20.9% oxygen,.9% Argon and small amounts of other gases Which graph type would best display the data? Line graph bar graph pie graph stem and leaf plot
asked by jill 
Math
Tim ate some chocolate cake for an afternoon snack He left 3/4 of the cake. If his parents ate 1/3 of the remaining cake for dinner, write a multplication problem to represent how much cake tims parentd ate
asked by Lina 
Physics
A centrifuge rotor has a moment of inertia of 3.30 102 kg·m2. How much energy is required to bring it from rest to 10000 rpm? I used KE=1/2Iw^2, but that answer i'm getting is incorrect. what am i missing?
asked by Syl 
6grade
the United States of America has 50 states.Wirte 50 as product of primes.Please help me out !
asked by Thanh 
Math
A bolt weights about 2/5 ounce. True or false The expresion 48 divided by 2/5 could be used to find the number of bolts in a 3 pound box
asked by Ash 
math
HOW I FRACTIENS!!!
asked by trollface 
English
Posted by rfvv on Thursday, December 2, 2010 at 3:41am. 1. What was her character? 2. What does she look like? 3. What's her personality? 4. What is she like? 5. What is she similar to? She was quiet and shy. (Can all the sentences from #5 to #1 be the
asked by rfvv 
Math Hw
Completed the following table for a pentagon. Regular Pentagon side length(inches) Perimeter(inches) 6 ? 8 ? 10 ? 12 ?
asked by Riley 
Math
If I were to take 2/3 of the 3/2 of the milk that was left in the fridge to make a 1/4 cup of 1/2 pound cookie dough pudding. How many frackshuns would it take to make 3/4 of 1/3 of the 1/2 sentence questions?
asked by Anonymous 
physics
To balance a 40.8kg automobile tire and wheel, a mechanic must place a 41.7g lead weight 25.0 cm from the center of the wheel. When the wheel is balanced, its center of mass is exactly at the center of the wheel. How far from the center of the wheel was
asked by ann 
Math
Regular Pentagon side length(inches)  6,8,10,12 Perimeter(inches)  ?,?,?,? fill in the ?
asked by Riley 
English
1. Look through the book. 2. Read through the book. (Are both the same? What is the opposite of the expressions?) 3. Look the book closely. 4. Read the book closely. (Are these the opposite of the two sentences?)
asked by rfvv 
chemistry
How much energy (in kilojoules) is needed to heat 5.45g of ice from 12.0 C to 32.0 C? The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K x mol) for ice and 75.3 J/(k x mol) for liquid water
asked by emily 
algebra
A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?
asked by omar 
physics
In moving a standard computer mouse, a user applies a horizontal force of 6.00×10−2 N. The mouse has a mass of 125 g. (a) What is the acceleration of the mouse? Ignore forces like friction that oppose its motion. (b) Assuming it starts from rest, what
asked by aly 
physics
A giant excavator (used in road construction) can apply a maximum vertical force of 2.25×105 N. If it can vertically accelerate a load of dirt at 0.200 m/s2, what is the mass of that load? Ignore the mass of the excavator itself.
asked by aly 
physics
A giant excavator (used in road construction) can apply a maximum vertical force of 2.25×105 N. If it can vertically accelerate a load of dirt at 0.200 m/s2, what is the mass of that load? Ignore the mass of the excavator itself.
asked by aly 
physics
A 7.6 kg chair is pushed across a frictionless floor with a force of 42 N that is applied at an angle of 22° downward from the horizontal. What is the magnitude of the acceleration of the chair?
asked by aly 
Europe
what is the most important advantage og having germany in the European Union?
asked by j 
Math 1
8x^7 over 9 Times 27y^2 Over 16x^3
asked by Jameela 
algebra
A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?
asked by omar 
AP Chemistry
Two solid objects, A and B, are placed in boiling water and allowed to come to temperature there. Each is then lifted out and placed in separate beakers containing 1000 g water at 10.0 degrees Celsius. Object A increases the water temperature by 3.50
asked by Samantha 
physics
(A.) A hawk flies in a horizontal arc of radius 13.4 m at a constant speed of 4.5 m/s. Find its centripetal acceleration. Answer in units of m/s2. (B.) It continues to fly along the same horizon tal arc but increases its speed at the rate of 1.45 m/s2.
asked by Jack 
physics
(A.) A hawk flies in a horizontal arc of radius 13.4 m at a constant speed of 4.5 m/s. Find its centripetal acceleration. Answer in units of m/s2. (B.) It continues to fly along the same horizon tal arc but increases its speed at the rate of 1.45 m/s2.
asked by Jack 
6th grade
what is the adjectives in this sentence: The runway was visible at night because it was lit very well.
asked by Kelsie 
Science
how could measuring the orbit of a comet help scientist understand when it will next be visible from earth
asked by Fran 
Chemistry
A student did not fully mix the solution of Oxalic Acid in the volumetric flask predict and explain the effect of the range of the students titration volumes when using the NaOH solution to titrate the Oxalic Acid solution
asked by andrea 
Math
cosx+cotX/secX+tanx=cosxcotx
asked by Leslie 
algebra
The length of a rectangular field is 50 meters more than twice its width. If the perimeter is 700 meters, find the dimensions of the field.
asked by Alice 
college
I need three characteristics of orientalism
asked by Betty 
math
what is the square root of pi?
asked by quinn 
Biology
A cell that is entering the M phase of the cell cycle is: A. always diploid, either with duplicated or unduplicated chromosomes B. always haploid, always with duplicated chromosomes C. either haploid or diploid, always with duplicated chromosomes D. either
asked by Jon 
Social Studies
Alright, I'm writing a research paper and am so confused. My topic is on whether or not participating in music affects a students standardized test scores. I am keeping track of scores over a period of time by keeping records of students. I know this is
asked by Jon 
Chemistry
suggest why the acetic acid concentration of a food vinegar must be known for regulatory health and saftey reasons
asked by peter 
Calculus Help
Find the area of the region enclosed by the hyperbola x^2/a^2y^2/b^2=1 and the vertical line through a focus
asked by Sarah