Questions Asked on
March 29, 2012

Physics wavelength problem! Please Help!
A communications satellite transmits a radio wave at a frequency of 5 • 109 Hz. What is the signal’s wavelength? Assume the wave travels in a vacuum. Show your work Thank You!
asked by LeXi;) 
chemistry
A Solution contains a mixture of Cl and Br ions. Can both be positively identified? Briefly explain. Write appropriate equations to support your answer.
asked by Anonymous 
english
Can someone check my work PLEASE.. Which of the following is not a strategy for revising your paper? Check for redundant language. Remove overly complicated language. Get rid of euphemisms and clichés. None of the above (my choice) Choose the correct word
asked by kevin 
geometry
it cost $350 to carpet an 8ft. by 10 ft room. at this rate, how many dollars would it cost to put the same carpeting in a 24 ft. by 30 ft. room?
asked by cate 
Chemistry
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.240 M sodium benzoate. How much of each solution should be mixed to prepare this buffer?
asked by Jematormal91 
Physics help please!!!
In February 2004, scientists at Purdue University used a highly sensitive technique to measure the mass of a vaccinia virus (the kind used in smallpox vaccine). The procedure involved measuring the frequency of oscillation of a tiny sliver of silicon (just
asked by BB 
Chemistry
Calculate the pH of a buffer solution obtained by dissolving 16.0 g of KH2PO4(s) and 27.0 g of Na2HPO4(s) in water and then diluting to 1.00 L. (pKa=7.21)
asked by Jematormal91 
physics
A force of magnitude Fx acting in the xdirection on a 2.50kg particle varies in time as shown in the figure below. (a) Find the impulse of the force. (b) Find the final velocity of the particle if it is initially at rest (c) Find the final velocity of
asked by sally 
physics
If you weigh 650 N on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter of 15.0 km ? Take the mass of the sun to be ms = 1.99×10^30 kg, the gravitational constant to be G =
asked by Kristina 
physics
On a perfect fall day, you are hovering at low altitude in a hotair balloon, accelerated neither upward nor downward. The total weight of the balloon, including its load and the hot air in it, is 24000 N. Find the weight of the displaced air. Find the
asked by Jim 
physics
a boy weighing 350N runs up a flight of stairs consisting of 20 steps each 10cm high in 10 seconds. What is his power? show your workings
asked by marv 
PHYSICAL SCIENCE QUESTION PLEASE I NEED YOUR HELP!
What is common to all light sources, including incandescent, fluorescent, neon, halogen, laser, and sodiumvapor devices? Thank You I really appreciate your help! :3
asked by jEnN 
Physics
A 10 charge sits at a point in space where the magnitude of the electric field is 1900 .What will the magnitude of the field be if the 10 charge is replaced by a 20 charge?
asked by Frustrated 
algebra 2
The formula d=1.35ãh models the distance d in miles from the horizon where h is the distance in feet from a personfs eyes to the water. If you are standing in a boat and the distance from the water to your eyes is 8 ft, what is your distance from the
asked by ben 
Calculus (Related Rates)
The position of a particle moving in a straight line is given by s(t) = (e^(t))(cos(5t)) for t>0, where t is in seconds. If the particle changes direction at time T seconds, then T must satisfy the equation: cos(5T) = 0 5T = arctan(1/5) 5e^(t) sin(5t) =
asked by Anonymous 
Statistics
A recent survey found that 72% of all adults over 50 wear glasses for driving. In a random sample of 100 adults over 50, what is the mean and standard deviation of the numbe who wear glasses?
asked by Sheila 
physics
Two point charges are fixed on the y axis: a negative point charge q1 = 23 µC at y1 = +0.23 m and a positive point charge q2 at y2 = +0.33 m. A third point charge q = +7.8 µC is fixed at the origin. The net electrostatic force exerted on the charge q by
asked by Kelly 
CALCULUS
A 25 ft ladder is leaning against a vertical wall. At what rate (with respect to time) is the angle theta between the ground and the ladder changing, if the top of the ladder is sliding down the wall at the rate of r inches per second, at the moment that
asked by Anonymous 
math
Quadrilateral ABCD is a square. The coordinates of point A are (3,2), coordinates of point B are (3,2),and the coordinates of points C are (3,4). where on a coordinate plane would I mark the location of point D??
asked by Dennis 
chemistry
A mixture of 8.95 g of Cl2 and 18.0 g of NO2 and an undetermined amount of SO2 occupies a volume of 22.4 liters at 760 mm Hg and 0 C. How many moles of SO2 are present?
asked by marie 
Physics (Gravitation)
In Fig. 1325, three particles are fixed in place. The mass of B is greater than the mass of C. Can a fourth particle (particle D) be placed somewhere so that the net gravitational force on particle A from particles B, C, and D is zero? If so, in which
asked by M 
Chemistry
Calculate the level from which the electron fell, n2, for the hydrogen line you observed. wavelength (lambda) = 400 nm n1 = 2 RH = 2.18 x 10^18 I keep having trouble with finding n2. Is the above given right to plug in for 1/(lambda) = RH (1/n1^2  n2^2)
asked by Priscilla 
chemistry
I keep getting wrong answers for this question. Determine the pH of an HF solution of each of the following concentrations. a) .280 M b) 5.3*10^2 M c) 2.50*10^2 M No Ka has been given. I haven't attempted b or c yet because I want to at least solve a
asked by maura 
math
If a plant manufacturing carpet backing has a cylindrical tank that is 3 meters high and is 6 meters in diameter. What is the volume of the tank? Assume 3.14 for pi.
asked by Anonymous 
Chemistry Question (oxide acidity)
Which of the following oxides is the most acidic? A. Al2O3 B. P4O10 C. SO3 D. MgO E. SiO2
asked by M 
Physics
A spherical glass ornament is 7.00 cm in diameter. An object is placed 11.8 cm away from the ornament. a) Where will its image form? b) What is the magniﬁcation of the image
asked by Angel 
chemistry
What is the volume at STP, in liters, occupied by 26.4 g of F2 gas?
asked by marie 
Algebra 2
Samantha is going on a vacation for the summer and is trying to choose between two different plans. The first plan costs 450$ for 3 days at a hotel and 2 days at an amusement park. The second plan offers 5 days at the same hotel and 3 days at the amusement
asked by Dr. David 
chemistry
Calculate the vapor pressure lowering of water when 5.67 g of glucose, C6H12O6, is dissolved in 25.2 g of water at 25 ºC. The vapor pressure of water at 25º C is 23.8 mmHg. What is the vapor pressure of the solution?
asked by MJ 
calc
1. Let R be the region bounded by the xaxis, the graph of y=sqr(x) , and the line x=4 . a. Find the area of the region R. b. Find the value of h such that the vertical line x = h divides the region R into two regions of equal area. c. Find the volume of
asked by naseba 
chemistry
A sample of N2 gas occupies a volume 180 mL at STP. What volume, in L, will it occupy at 640 mm Hg and 295 K?
asked by marie 
Geometry
On the scale drawing of a floor plan 2 inches= 5 ft. A room is 7 inches long on the scale drawing. Find the actual length of the room.
asked by Cassie 
physics
A 67.5kg basketball player jumps vertically and leaves the floor with a velocity of 1.66 m/s upward. (Take upward as positive and forward as positive.) (a) What impulse does the player experience? magnitude direction (up,down, back or zero) (b) What force
asked by sally 
physics
A mountainclimber friend with a mass of 82 kg ponders the idea of attaching a heliumfilled balloon to himself to effectively reduce his weight by 25% when he climbs. He wonders what the approximate size of such a balloon would be. Hearing of your physics
asked by Jim 
Physics please help
A small circular object with mass m and radius r has a moment of inertia given by I = cmr2. The object rolls without slipping along the track shown in the figure. The track ends with a ramp of height R = 3.0 m that launches the object vertically. The
asked by Adam 
physics
A rock thrown horizontally from a bridge hits the water below at a horizontal distance x directly below the throwing point. The rock travels a smooth parabolic path in time t. A.) Show that Therapy vertical distance of the bridge above water is 1/2gr2. B.)
asked by liz 
physics
Estimate the buoyant force that air exerts on you. (To do this, you can estimate your volume by knowing your weight and by assuming that your weight density is a bit less than that of water.) Assume that your weight is a about 1000 N, for example.
asked by Jim 
finance
Ngata Corp. issued 18year bonds 2 years ago at a coupon rate of 9.6 percent. The bonds make semiannual payments. If these bonds currently sell for 101 percent of par value, the YTM is
asked by Anonymous 
chemistry
A mixture of 8.95 g of Cl2 and 18.0 g of NO2 and an undetermined amount of SO2 occupies a volume of 22.4 liters at 760 mm Hg and 0 C. How many moles of SO2 are present? I keep coming up with 62 and that is not right. Someone please help!!
asked by marie 
Physics
A concave makeup mirror is designed so that a person 25.3 cm in front of it sees an upright image at a distance of 54.0 cm behind the mirror. a) What is the radius of curvature of the mirror? Answer in units of cm
asked by Angel 
statistics
A study of 35 professors showed that the average time they spent creating test questions was 13.5 minutes per question. The standard deviation of the population is 3.8. Which of the following is the 99% confidence interval for the average number of minutes
asked by Holly 
Chemistry
How much more acetic acid (pKa = 4.76) than acetate should be in solution to maintain a pH of 4.00?
asked by Jematormal91 
geometry
the pentagons are similar. the area of the smaller pentagon is 30m squared. what is the area of the larger pentagon in m squared?
asked by t 
Sakai high
a spring (k = 2.3 n/m is attached to a object of mass = 10 kg if the object is hung from the ceiling how much would the spring be stretched
asked by kai mera 
physical science
a hammer falls off a rooftop and strikes the ground with a certain kinetic energy. if it fell from a roof twice as tall, how would its kinetic energy compare? explain
asked by tim 
physics
A 0.255kg volleyball approaches a player horizontally with a speed of 14.2 m/s. The player strikes the ball with her fist and causes the ball to move in the opposite direction with a speed of 22.0 m/s. (a) What impulse is delivered to the ball by the
asked by sally 
Chemistry
Aluminum sulfate and calcium acetate = ?
asked by Alexis 
Chemistry
The normal melting point of H2O is 273.15 K, and deltaH fusion is 6010 J/mol. Calculate the change in the normal melting point at 175 and 625 bar assuming that the density of the liquid and solid phases remains constant at 997 and 917 kg/m^3 respectively.
asked by Jason 
math
Krispy Kritters Cereal used to come in a box with a volume of 2,850 cm. However, The Krispy Kritters Co designed a new larger box, 22.5cm wide, 6.2cm deep, and 30cm high. How many more cubic centimeters will the new box hold than the old box?
asked by Anonymous 
Chemistry Question
The reaction of quicklime (CaO) with sulfur dioxide (SO2) is an important reaction for reducing SO2 emissions from coalfired power plants: CaO(s) + SO2(g) → CaSO3(s) This reaction is an example of: A. a precipitation reaction B. an electrolysis reaction
asked by M 
math
Car rental agency A charges $50 per day plus 10 cents per mile driven. Agency B charges $20 per day plus 30 cents per mile driven. For a oneday rental it is cheaper to rent from agency A if you drive more than?
asked by Anonymous 
Chemistry
Nitrogen Dioxide , a pollutant in the atmosphere, can combine with water to form nitric acid. One of the possible reactions is shown here. Calculate delta ∆G° and Kp for this reaction at 25°C and comment on the spontaneity of the reaction.
asked by SANDY 
math help
A lab assistant wants to make FIVE LITERS of 31.2% acid solution. If solutions of 40% and 18% are in stock, how many liters of each must be mixed to prepare the solution. i don't even know what equation to use or anything, please help me, thank you.
asked by amy 
Math (Grade 9)
Elizabeth visits her friend Andrew and then returns home by the same route. She always walks 2km/h when going uphill, 6km/h when going downhill and 3km/h when on level ground. If her total walking time is 6 hours, then what is the total distance she walks
asked by Rezu 
6th grade history
how did athens become rich?
asked by katrina 
Chemistry
Toluene, C6H5CH3, is a liquid similar to benzene, C6H6. It is the starting material for other substances, including trinitrotoluene (TNT). the molality of toluene in a solution that contains 26.2 g of toluene and 132 g of benzene. Calculate the molar
asked by MJ 
Math 11
The distance between two cities on a map is 7cm. The actual distance between two cities is 350 km. What is the scale used on this map? Could someone possibly simplify the answer in its most simplified form?
asked by Raymond 
chem help
the primary visible emissions from mercury are 404.7 nm and 435.8 nm. Calculate the frequencies for these emissions. Calculate the energy of a single photon and of a mole of photons of light with each of these wavelengths.
asked by danielle 
chemistry
how many grams of CO are needed to react with an excess of Fe2O3 to produce 209.7gFe? Fe2O3(s) + 3CO(g) => 3CO2(g) + 2Fe(s)
asked by help please 
math
A stack of 10 quarters is a cylinder. If the diameter of a single quarter is 2.2 cm and the approximate height is 0.17 cm, what is the surface area of a 10quarter stack?
asked by Anonymous 
physics
What would be the final temperature of a mixture of 50 g of 15 degrees C water and 50 g of 40 degrees C water?
asked by Kristie 
Physics
A cannon tilted up at a 34.0^\circ angle fires a cannon ball at 69.0 m/s from atop a 23.0 mhigh fortress wall. What is the ball's impact speed on the ground below?
asked by Cody 
math
in 1968, vehicle emmision standards allowed 6.3 hydrocarbons released per mile driven. By 1980, the standards allowed only .41 hydrocarbons released per mile driven. What was the rate of change from 1968 to 1980?
asked by Anonymous 
math
i also have a math test tomorrow and i get sooo confused with irregular shapes in geometry
asked by Sheil 
algebra
Flying with the wind, a pilot flew 600 mi between two cities in 4 h. The return trip against the wind took 5 h. Find the rate of the plane in calm air and the rate of the wind. Please show work. thanks
asked by PLEASE NEED HELP 
Chemistry Question
A 500mL aqueous solution of NaCl was electrolyzed for 15.0 minutes, producing Cl2 gas at the anode. If the pH of the final solution was 12.15, calculate the average current used. (hint: what products are produced at the cathode?) A. 3.8 A B. 2.2 A C. 0.47
asked by M 
physics
The weight of the atmosphere above 1 m^2 of Earth's surface is about 100,000 N. Density, of course, becomes less with altitude. But suppose the density of air were a constant 1.2 kg/m/s^3. Calculate where the top of the atmosphere would be.
asked by Jim 
Chemistry(Please check, thank you)
For an experiment on the effect of a buffer solution, I need to calculate the expected pH of the buffer. I know that I have to make an amounts table and use the Hasselbalch equation to find the pH. For the first part, 0.10M HCl was added to a buffer. The
asked by Hannah 
calculus
Verify the identity: cos x cox x/1tan x = sin x cos x/sin x cos x
asked by Adc 
Math Problem
the side of a square are lengthened by 6cm the area becomes 121cm 2 square find the lenght of a side of the original square.
asked by Lavern 
chemistry
Jessica's teacher has asked her to bring her 0.40 moles of sodium chloride to the laboratory. She should bring approximately _______ grams.
asked by jose 
math
40% of the 300member sophomore class is in the band. The percussion section is made up of 5% of these band members. How many of the sophomore class band members make up the percussion section?
asked by Anonymous 
algebra
Finances. During one month, a homeowner used 500 units of electricity and 100 units of gas for a total cost of $352. The next month, 400 units of electricity and 150 units of gas were used for a total cost of $304. Find the cost per unit of gas. Please
asked by PLEASE NEED HELP 
Chemistry Question (currents)
A 500mL aqueous solution of NaCl was electrolyzed for 15.0 minutes, producing Cl2 gas at the anode. If the pH of the final solution was 12.15, calculate the average current used. (hint: what products are produced at the cathode?) A. 3.8 A B. 2.2 A C. 0.47
asked by M 
math
In a box of 1,000 batteries, 40 batteries are defective. What is the probability that the first battery you pick up will be defective?
asked by antoino 
physical science
A soccer player applies a force of 51.5 N to a soccer ball while kicking it. If the ball has a mass of 0.46 kg, what is the acceleration of the soccer ball?
asked by Tityana 
Chemistry Help!!!!!!
95.65 grams of barium hydroxide were dissolved in 2000ml of water. 88 grams of carbon dioxide were passed through the solution producing a white precipitate. what was this white precipitate and how many grams of it were produced. explain please!!!! i got
asked by Amber 
Physics
A small circular object with mass m and radius r has a moment of inertia given by I = cmr2. The object rolls without slipping along the track shown in the figure. The track ends with a ramp of height R = 3.0 m that launches the object vertically. The
asked by Adam 
Language Arts
Having trouble deciding between adverb or adjective for the word "nearby" in this sentence: An artist had set up an easel nearby. At first I was thinking adjective like which easel ...the one nearby. But then I thought maybe adverb for the question where
asked by Brandi 
math
If Pete colored 1/2 of a poster and Rebecca colored 1/3 of the poster. What fraction still needs to be colored?
asked by Robert 
physics
An experiment makes use of a water manometer attached to a flask. Initially the two columns in the gas manometer are at the same level and the air pressure in the flask and both sides of manometr is 1 atm. The experiment is set up when the air pressure is
asked by ms 
physics
Each of the four wheels of a car push on the road with a force of 4.0*10^3 N [down]. The driving force on the car is 8.0*10^3 N [W]. The fictional resistance on the car is 6.0*10^3 [E]. Calculate the following A) the mass of the car B) the net force on the
asked by Maggie 
physics
A spoked wheel with a radius of 44.0 cm and a mass of 1.90 kg is mounted horizontally on frictionless bearings. JiaJun puts his 0.550kg guinea pig on the outer edge of the wheel. The guinea pig begins to run along the edge of the wheel with a speed of
asked by Riya 
SS7R  EC
who is lady justice? Please i don't want any words that are huge. I want it in a 7th grade level.
asked by Laruen 
Chemistry
Calculate the partial pressure of monatomic hydrogen in hydrogen gas at 2000 K and 1 atm pressure. Given: (i) For ½ H2 > H, DeltaHo298=217,990 J; DeltaSo298=49.35 J/K. (ii) Assume that the heat capacity of monatomic gas to be 3/2R (iii)The heat capacity
asked by John 
Physics please help
This is for my earth science class I have not had physics If a person pulls on a cart to the right with a force of 10 N and a second person pulls to the left with a force of 3 N, what is the net force(+direction)on the cart? I came up with 130 N downward
asked by JOY 
Chemistry
For each of these reactions, indicate the property which might be observed in order to determine when equilibrium has been reached. a) PCl5(g) PCl3(g) + Cl2(g) b) CaCO3(s) CaO(s) + CO2(g) c) H2O(l) H2O(g) d) Cl2(g) + 2H2(g) H2(g) + 2HCl(g) e)
asked by Billy Bob 
algebra
If $8,500 is deposited in a compound interest account paying 3.9% interest annually, how much will be in the account after 12 years?
asked by Anonymous 
English 3
8. The modernist movement challenged American writers to a. adopt Marxism as a philosophical basis for their work b. set their stories and poems in the South or Midwest c. find new themes, subjects, and styles for their work d. avoid the influences and
asked by mysterychicken 
Math 11
In a photograph, a man is 1.3cm tall and a flagpole is 4.8cm tall. If the man is 190 cm in real life, how tall is the flagpole, to the nearest centimetre?
asked by Raymond 
computer science
You have been working for the XYZ Computer Corporation as an entrylevel software engineering since you graduated from college last May. You have done very well so far; you are respected by management, well liked by your fellow employees , and have been
asked by Enid 
physics
What are the temperatures for freezing water and boiling water on the Kelvin temperature scale? a)273K for freezing water; 373K for boiling water b)0K for freezing water; 100K for boiling water c)32K for freezing water; 212K for boiling water
asked by Kristie 
Chemistry
How many grams of lead(ii)iodide are generated when 400.0ml of 1.25M NaI reacts with 525.0ml of 1.00M Pb(NO3)2 according to the following balanced equeation? 2NaI + Pb(NO3)2> 2NaNO3 + PbI2
asked by Jason 
English
What was not considered a part of the Harlem Renaissance? a.literature b.art c.music d.architecture
asked by MM 
Algebra
Brian is 26 years oldr than his daughter Kim. The sum of their ages is twice the differences of their ages. Find theri ages.
asked by Anonymous 
math
on a trip to the mall amber spent half her money on clothes and one fourth of her money on a gift for a friend. she spent 24 dollars in all. how much money did
asked by arianna 
Math
A student wants to display the average monthly temperatre for one year.He chooses a line graph to display the data.Describe and correct the error made in choosing that type of display for the data.
asked by Zoe 
Chemistry
C(s) + H20(g)↔ CO(s) + H2(s) the equilibrium constant for this reaction is 4.251 x 10^2 at 800 K. if the equilibrium concentration of H2O(g)is 0.1990 M, what are the concentrations of CO, H2, and C?
asked by Someone 
History!!! Help me!! Thank you!!
1. Find a line that shows that Mr. Covey did not care that Douglass was too sick to work. (Chapter 10) 2. Find a line that shows that Master Thomas did not believe Douglass’ complaint against Mr. Covey. (Chapter 10) 3. Find a line that shows that Mr.
asked by Bell 
Language Arts
Having trouble with this one. I'm supposed to rewrite the sentence and put the modifier where it belongs. The sentence is: I only go to the beach on weekends, never on weekdays. Would you rewrite it like: I go to the beach only on weekends, never on
asked by Brandi 
chemistry
What is the total pressure in a 4.00 L flask at 298 K, that contains 2.6 moles of He, 0.8 moles of Ne, 1.6 moles of O2?
asked by marie 
Chemistry
Toluene, C6H5CH3, is a liquid similar to benzene, C6H6. It is the starting material for other substances, including trinitrotoluene (TNT). Find the molality of toluene in a solution that contains 26.2 g of toluene and 132 g of benzene.
asked by MJ 
Precalculus
What is the answer and how did you do for this question? Please I really need help! :( Express in rectangular form: 6(cos(4π)/(3)+i sin(4π)/(3)?
asked by Scarlet 
Algebra 2
John has $1800 hidden under his mattress and $250 in the cookie jar. He decides to take his money to a bank, where he divides it between an investment earning 8% and an investment earning 9.5%. If he earns $181.25 in simple interest, how much is in each
asked by Anonymous 
English
Writeacher, I'd like you to revise these sentences, please. Thank you. 1) Our history teacher has included a new email address for the students participating in the project:...... All the post your 17 students have sent so far has been transferred to the
asked by Matthew 
English
Hello Any suggestions for a game? English learners (15 year olds) The class lasts for 20 minutes. They don't want anything with grammar, vocabulary and so on. They said they want to play something! Do you have something from your classroom?
asked by Mark 
algebra
use method of substitution to solve the system of linear equation 3x+4y=3/2 y=2x1
asked by scott 
Math
An unusual die has six faces labelled 1,2,3,5,7 9. If two of these dice are rolled, and the numbers showing on the upper faces are added, what is the number of possible different sums? 14? Flora had an average of 56% on her first 7 exams. What would she
asked by Rezu 
plzz help physics
An experiment makes use of a water manometer attached to a flask. Initially the two columns in the gas manometer are at the same level and the air pressure in the flask and both sides of manometr is 1 atm. The experiment is set up when the air pressure is
asked by ms 
math
Tristan is having a birthday party. He doesn’t want anyone less than 10 years old to come to his party. If y equals age in years, which number sentence expresses his age requirements? A. y < 10 B. 10 = y C. y 10 D. 9 > y
asked by math 
math
Celina wants to draw the exact square she saw in a workbook. The list below shows the tools she has. string, pencil, calculator, compass, straightedge, tape Which tools in the list are not required for Celina to draw the square?
asked by lolo p 
Government
The antifederalist were against ratification of the constitution mostly because? A. they were anarchists B. their experiences under British rule C. they felt the states should have less power D. they were against proportional representation I think well A
asked by MM 
chemisrty
what volume of hydrogen gas at STP can be produced by reacting 15.0 grams of uluminum with sulfuric acid? the equation is: 2Al+ 3H2SO4> Al2(SO4)3+ 3H2
asked by kim 
types of business writing
Revised and wanting to know if it's ready for submittance: BROADWORTH GENERAL HOSPITAL Interoffice Memo TO: Miriam Hopkins, Director of Human Resources FROM: Shawna Parker, Administrative Assistant DATE: March 22, 2012 SUBJECT: Sexual Harassment and
asked by Shawna 
physics
A bullet of mass 12.4 g is fired into an initially stationary block and comes to rest in the block. The block, of mass 1.02 kg, is subject to no horizontal external forces during the collision with the bullet. After the collision, the block is observed to
asked by Sarah 
Chemistry
For each of these reactions, indicate the property which might be observed in order to determine when equilibrium has been reached. a) PCl5(g) PCl3(g) + Cl2(g) b) CaCO3(s) CaO(s) + CO2(g) c) H2O(l) H2O(g) d) Cl2(g) + 2H2(g) H2(g) + 2HCl(g) e)
asked by Billy Bob 
geometry
a person is standing 12m away from a street light that is 9m tall. How tall is he if his shadow is 3m long?
asked by sarah 
chemistry
7.0 mL of 0.5 M acetic acid contains 0.0035 moles of acetic acid. how many moles of sodium bicarbonate are needed to react with 0.0035 moles of acetic acid?
asked by shownuff 
geometry
f equilateral triangle JKL is cut by three lines as shown above to form four equilateral triangles of equal area, what is the length of a side of one of the smaller triangles?
asked by Anonymous 
Chemistry
How many grams of Fe are in 6.6 g FeO. (Remember the percent Fe in FeO is the grams of Fe in 100 g of FeO)
asked by Ambra 
Calculus
Two force vectors act on an object and the dot product of the two vectors is 20. If both of the force vectors are doubled in magnitude, what is their new dot product?
asked by Jake 
Math (9th)
A classroom contained an equal number of boys and girls. Eight girls left to play hockey, leaving twice as many boys as girls in the classsroom. What was the original number of students present? 32 students? In a recent election at the Dr. John Hugh Gillis
asked by Rezu 
algebra 2
I don't know how to do this the speed of train A is 18mph slower than the speed of train B train A travels 190 miles in the same time it takes train B to travel 280 miles find the speed of each train please help so i can pass my quiz.
asked by karon 
Calculus
For which value(s) of k will the dot product of the vectors (k,2k1, 3) and (k,5,4) be 7? I did this so far, 2k1=5 6/2 k=3
asked by Jake 
math
sadie has a drawer filled with pink, purple, yellow, and green socks. if she draws socks out of the drawer one at a time, how many will she have to pull out before she has a matched pair?
asked by zuny 
Statistics
if a rifleman averages 8 hits out of 10 shots at a target, what is the probability that he will hit the target in 3 out of 4 shots
asked by jay 
Math
Select any concept from this week.(Linear equations,exponents, Logarithmic problems Write a 350 to 700word response in which you examine the importance and applicability of this concept. Describe why this concept is important and how it can be applied to
asked by Tiara 
Electronics
Can you help with questions that have diagrams you must use?
asked by Christian 
Math
Barb and tammy shared a sub sandwich, but while Tammy was setting the table, Barb ate 2/5th of it. When Tammy came back, she ate 3/4 of what was left. How much of the sub did Tammy eat? Write a math equation.
asked by Hayden 
Life orientation
What are environmental or human factors that causes ill health,accidents,crises,and disasters in limpopo
asked by Mokete 
English
I need help writing a 150200 word paragraph on Identify an introductory technique that could be used to grab the readers attention and showcase the main idea?
asked by Theresa 
Math help please
A lab assistant wants to make five liters acid solution. If solutions of 40% and 18% are in stock, how many liters of each must be mixedto prepare the solution Amount in liters: 40%: 18%:
asked by Janine 
Mathematics
What is 0.6417 divided by 31
asked by Riann 
7th grade math
Could someone show me how to do this please? 26.2% of a certain number is 81. What is the number?
asked by saranghae12 
5th grade science
I need to come up with the 3 kingdoms that are mainly cellular and the 3 kingdoms that are mainly unicellular. Would the mainly cellular be: animal, plant, and fungi and then the mainly unicellular be: protis, archea, and bacteria? Thanks.
asked by Brandi 
Scale Representations
A model airplane is made on a scale of 1:128. A)What is the scale factor of the model? B)If the airplane has a wingspan of 30 cm, what is the wingspan of the actual airplane?
asked by Sari 
Math
Write an equation of a cosine function with Amplitude=4, Period=pi/2, and Phase Shift=pi?
asked by Purplechick4 
physics
A door has mass M, width W, and height H. It is attached to a door frame by only two hinges: one at 5H/6 (the top hinge) and one at H/6 (the bottom hinge). Calculate the force that the door frame exerts on each hinge.
asked by anonymous 
math
The 7 inch diameter drive drum of a belt conveyor is turning at 130 rpm. What is the belt speed (ft/min) if there is no slip between the belt and drum? What are the steps to figures this out? Thank you for your help.
asked by Sushmitha 
math (Ms.Sue)
a bag of 25 marbles contains 8 red marbles.if one marble is picked from the bag,what is the probability that it is red in percent? My answer is 32% am i right?
asked by miki 
algebra
solve by addition method x +3y +z =6 3x + y – z = 2 2x +2y – z = 1 thanks
asked by PLEASE NEED HELP 
math
A customer is buying a $100 drill and two $15 drill bit sets. The customer uses a gift card worth $50 to pay for a portion of their bill. How much cash will the customer pay (before taxes)?
asked by Anonymous 
PreAlgebra
Jake spent 3/8 of his money on a book and 1/2 of what was left on a magazine. Now he has $6.25. How much did he start with?
asked by Anonymous 
algebra
f(x)=v^2+13/v^24v32 Find all numbers that are not in the domain of the function. Then give the domain in set notation.
asked by Anna 
algebra
A ball is thrown into the air with an upward velocity of 28 ft/s. Its height (h) in feet after t seconds is given by the function h = –16t² + 28t +
asked by Anonymous 
Analysis
Write an equation of a cosine function with Amplitude=4, Period=pi/2, and Phase Shift=pi? Also write an equation of a cosine function with Amplitude=1/2, Period=6pi, and Phase Shift=pi/3?
asked by Purplechick4 
Analysis
Find the amplitude, period, and phase shift of the functions: f(x)=4sec(x+3pi/2) f(x)=tan((1/3t)pi) f(x)=5sin(4t+3pi)
asked by Purplechick4 
math
Solve 3(x10)>x+5. Write your solution using set builder notation. please show work
asked by Renee 
College Chemistry
A stock solution is prepared by adding 20mL of 0.2M Na3PO4 to enough water to make 80mL. What is the Na+ concentration of 20mL of the stock solution? I am thinking .012: a) .02 times .2 = .004 b).004 times 3 = .012 (for each Na in the molecule) Seems too
asked by Kev 
physics
A coin of 5.30 gram is placed 12.0 cm from the center of a turntable. The coin has static and kinetic coefficients of friction with the turntable surface of = 0.900 and = 0.470. What is the maximum angular velocity with which the turntable can spin without
asked by jaeny 
Physics
if you had two ping pong balls (or golf balls, or tennis balls), both carrying the maximum possible positive electrical charge, and you also had insulating gloves that allowed you to pick them up without being shocked, would you be strong enough to make
asked by Amber 
Economics
what are some advantages and disadvantages of welfare?
asked by Labz 
chemistry
How are the spots on the TLC plates observed?
asked by mzrins 
math
m/8=24
asked by rosy 
Accounting
Store equipment is purchased on January 1, 2002 at a cost of $14,000 and $1,000 was spent on its installation. The depreciation is writtenoff at 10% on the original cost every year. The books are closed on December 31, every year. Prepare a Depreciation
asked by Anonymous 
Math
Find the derivative: y = square root of x(x+14). The square root is only on the x. Please show work and explain. I don't know how to do this. Thanks!
asked by JJ 
statistics
According to a recent studey, 1 in every 4 women has been a victim of domestic abuse at some point in her life. Suppose we have randomly and independently sampled twentyfive women and asked each whether she has been a victim of domestic avbuse at some
asked by Sheila 
calculus
Verify the identity: cos x cox x/1tan x = sin x cos x/sin x cos x
asked by Adc 
Science 7R
name in order the organs through which food passes as it moves through the digestive system
asked by Laruen 
science
Give examples of how humans have increased their food supply and what effects these methods have on the environment overall.
asked by Bob 
chemistry
how much NaOH would be needed to dissolve in H2Oto prepare 2.00L of a NaOH solution in which [OH]=0.95 M?
asked by lindsey 
Chemistry
C(s) + H20(g)↔ CO(s) + H2(s) the equilibrium constant for this reaction is 4.251 x 10^2 at 800 K. if the equilibrium concentration of H2O(g)is 0.1990 M, what are the concentrations of CO, H2, and C?
asked by Someone 
Math
write an equation of a cosine function with Amplitude=1/2, Period=6pi, and Phase Shift=pi/3?
asked by Laura 
boring history
how did socrates challenge the values of the people of athens?
asked by katniss 
Statistics
Give a brief account of the chief methods of collecting primary data? My answer: is personal Investigation Through investigation collection through questionnaire and through telephone, and of course i have explained each one of them, i just wanted whether
asked by pallavi 
Business
Is it possible for a small business to oversegment its market?
asked by Bryan 
Grammar
Im using the word feel as an action verb in a sentence. please tell me if this makes sense at all I can feel the air on my hair.
asked by Losa 
math
What can you say about sets A and B if you know that. 1)A U B = A? 2)A ¿ B = A? 3)A  B = A?
asked by Fakaapo. Suetusi 
math
A 12 food wide fertilizer spreader drops 45 pounds of fertilizer while traveling 625 feet. What is the fertilizer application rate in pounds/acre?
asked by Nabil 
math
if a math rpoblem says that a square is worth 2cm, and they want you to find the area of 6 squares how are they using the term "worth"?
asked by Yolanda 
Chemistry
Consider the cracking of gaseous ammonia at constant total pressure of 1 atm and constant temperature. Find the equilibrium gas composition at 400 degree C. Given: The Gibbs free energy for the cracking reaction 2NH3 = N2 + 3H2, DeltaGo ( delta G standard)
asked by John 
Types of Business writting
Revised and errors corrected , is it ready for submittance? Dear Mr. Dittmer: I am writing to you to request a trainer for our seminar on sexual harassment and unlawful discrimination in the workplace for twenty of our office supervisors. Our company would
asked by Shawna 
Math
if a rifleman averages 8 hits out of 10 shots at a target, what is the probability that he will hit the target in 3 out of 4 shots
asked by jay 
Science
Ok I am kinda stuck on this problem. So the question is; A measure of the average kinetic energy in an object is______________; so I really need an answer. The passage is about the solar system. Please help anything right now, even a word! Lol. Ok thank
asked by Madelyn Santiago 
chemestry
Please answer the following THAT I CAN'T!!! Where is Plutonium found? How common is Plutonium in nature? What does Plutonium look in pure form? What does Plutonium's atomic nucleus look like? THANK YOU!!
asked by lizzy 
trig
2sin^2x1=0[0,2pi)
asked by Sur 
business english
many organizational situaions involve an audience that consists of a group of people. which is an appropriate approach to analyzing this type of audience? a. rely on the fact that generalizations are true for all members of a group b. disregard demographic
asked by melody 
math
3/5 of the female members and 1/3 of the male members attended a meeting. 108 members attended the meeting. There were 260 members in the club. How many more male than female members were there in the club?
asked by lm 
Math
In which of the following sets of points is y a function of x? A= {(2, 2), (4, 6), (5, 3), (5, 1)} B= {(2, 2), (3, 4), (4, 4), (5, 4)} C= {(1, 4), (2, 3), (4, 4), (4, 1)} D= {(1, 4), (1, 5), (2, 6), (3, 5)}
asked by Keyaria 
Math
Solve the following equation: 3/11x=15
asked by Renee 
Algebra 2
Part 1 Describe the graphs of the functions f(x) = 2^x – 1 and g(x) = –2^x – 1 Part 2 Compare and contrast the domain and range of f(x) and g(x).
asked by Courtney 
math
Dan has 36 coins in his collection. 3/4 of the coins are quarters. How many quarters does Dan have?
asked by Anonymous 
Chemistry
how do you show the synthesis of copper (1) chloride?
asked by Alexis 
geometry
Here is an equation for a sphere: (x18)^2+(y5)^2+(z+11)^2=36 give the coordinates of two points on the sphere. I know how to find coordinates on a circle using the equation (xh)^2+(yk)^2=r^2 but I can't figure out how t do it with a sphere.
asked by SoccerStar 
English
I realized I sent you the wrong sentences. Can you please have a look at them? 1) Our history teacher has included a new email address to be used only by the students participating in the project:...... All the post your 17 students have sent so far has
asked by Matthew 
math
Solve the equation for the value of , where . a) Pass b) c) d) e) 7:
asked by carolyn 
accounts
solve the following transactions made by jim a contractor january 4 2009. bought 850 stock, trade 10% 5/10 net 60 days. what is the amount due if paid in cash?
asked by MEL 
math fraction
10 out of 36 students love math, 13 love science and the rest love english. write down the fraction of students who love science.
asked by susy 
chemistry
pH of HF 5.3*10^2 M Since HF is a weak acid, I'm not sure which formula to use.
asked by maura 
...
an object approaches the bottom of a ramp, point a. It goes up the ramp and turns around at point b, which is 40.0 m above a. The ramp makes an angle of 30 degrees with the horizontal. what is the speed of the object at point a?
asked by Anonymous 
finance
Defining capital structure weights) Templeton Extended Care Facilities, Inc. is considering the acquisition of a chain of cemeteries for $410 million. Since the primary asset of this business is real estate, Templeton’s management has determined that
asked by ronald 
Lauguage arts and History
I need help these! Please help me! Thanks! Identify two parts of chapter 10 that struck you the hardest from Frederick Douglass’ descriptions. Create a T Chart with quotes on the left and your response on the right. 1) What should be done about the newly
asked by Bell 
Res/341
examples for discrete and continuous data
asked by anita 
grammar
Does my poem have correct puntation and capitalization? He snaps a whip, On a cargo ship, Full of slaves, That don't behave.
asked by Dakota 
Science
We conducted an expirement to detect disulphide groups in protein. One tube(lysozyme) contained unkowns, had approx 9.34 micromoles of disulphide groups. The question asks me to work backwards through all the dilution factors taken to give number of
asked by Shri 
algebra
method of substitution the perimeter of some traffic sigh must be 126 inches. Also its length is 11 inches longer than its width. Find the dimensions
asked by scott 
Chemistry
We conducted an expirement to detect disulphide groups in protein. One tube(lysozyme) contained unkowns, had approx 9.34 micromoles of disulphide groups. The question asks me to work backwards through all the dilution factors taken to give number of
asked by PLEASE HELP ME!! 
Jiskha
A few weeks ago or a month I tried to post but it refuse too
asked by Laruen 
Question
Is RISD/Brown Dual Program is a good school? im thinking of not applying to yale and apply to that school
asked by Laruen 
math
I don't know what to do..please help.The doctor estimates that more than 220 out of the 500 patients in his database take vitamin each year. A random sample of 60 patients shows that 27 o them take vitamin each day. how to use a proportion to predict the
asked by Frances 
healthcare
list expectations of staff when completing asssessment tools and forms at aged care and why is this important for
asked by Lisa 
English
I urgently need you to help me express the following sentence. Thank you. 1) In the past my daughter has suffered from a disease called oxyuriasis which can affect a person's intestine. I'll give her the proper medication in case she
asked by Matthew 
health
What are the implications of this shift for hospitals, consumers, and the health care delivery system as a whole
asked by shannon 
Math Problem
Please multiply and simplify the answer I am having trouble with (3x+7)(4x^2+2x+8)
asked by Lavern 
History
What is the name of the ship that sank during WWII and is the greatest maritime disaster resulting more deaths than the Titanic?
asked by Rezu 
Accel Math
In a dice game if you roll a 2, 4, or 6 you get the value of the die. If you roll as 1, 3, or 5 you lose $5. What is the expected value of the game?
asked by Stan 
writing
Where in the Harry Potter series does hermione Granger become a woman?
asked by Tina 
History
What accomplishment did John Glenn suceed in completing during 1962?
asked by Rezu 
platonic solids
what is formula for deciding size of pentagons to make a 9" tall (12", 16" tall, etc.) dodocahedron?
asked by jesse 
math
Alex is playing soccer. He can kick a ball 58 feet per second. How long is the ball in the air?
asked by Kadie 
Calculus
derivative of y=ln2^x please help, I am getting the wrong answer every time
asked by Casey 
Math
Points A and B are noted on the straight line y=2x+4.If the distance between them is 5,what is the difference between their ycoordinates?
asked by Mike 
nonsubject: NJHS qualification
Does this make sense? : I am in service of my family duties. Please help.
asked by Losa 
statistics
A poll claims that 70% of the population is for a new amendment. A random sample of 49 people showed that 27 voted in favor of the new amendment. Give a 95% confidence interval. Give lower limit and upper limit accurate to four decimal places
asked by robert 
statistics
A Packaging Company sells soda and claims each can contains 12 oz. A random sample of 15 sodas yielded a sample mean of 11.2 oz. Given the sample standard deviation is 0.3 oz, estimate the margin of error for a 90% confidence interval.
asked by robert 
Math
Find the domain, range and vertical asymptotes for the following problems: f(x)=2^x3, f(x)=1+3^x, f(x)=ln(x1)2
asked by Mola 
chemistry
calculate the ph of 20 ml of .1M NaOH to 40 ml of acetic acid
asked by mark 
Intermediate Algebra
What is the square root of (24).Simplify. Show work.
asked by sherry 
Exploring Multiplication
how can you find out how many slices your class needs if each pizza has 8 slices and ther are 28 kids?
asked by Alexandra 
chemistry
calculate the ph of 20 ml of .1M NaOH to 40 ml of acetic acid
asked by mark 
chemistry
calculate the ph of 20 ml of .1M NaOH to 40 ml of acetic acid
asked by mark 
chemistry
calculate the ph of 20 ml of .1M NaOH to 40 ml of acetic acid
asked by mark 
math
input .05 output 25
asked by heyyyyyy 
science
Hi, tomorrow is my science practical and i need help with independent and dependent variables. PLEASE HELP
asked by Sheil 
chemistry
How many grams of solute are present in 785 mL of 0.480 M KBr?
asked by Kate 
English
BACKGROUND: Ten years ago, I started working as a clerk for DMD Medical Supplies. Six months ago, Liz, the human resources director, promoted me to office manager. I manage two employees: Jack and Ruth. My office provides secretarial support for the four
asked by Kayla 
science
Examine the obvious environmental impacts as well as significant social and physical ramifications of urban sprawl. What is the relationship between landscape and psychological well being? After defining this relationship, discuss how the presence or
asked by Bob 
macroeconomics
explin the inner and outer flows of an open system
asked by mike 
math
Find the term of AP is 3and eleventhterm is 18. Find the number of term in the progression. Ie the sum is 81.
asked by Anonymous 
math
4x2.25 +1.95x3+6x.29+6x.89+11x.39+3x.39=
asked by Anonymous 
calculus
The three pigls are building their houses while the brik=ck house building pig and the stick house building pig are working at a steady rate, the straw house building pig(knowing the wolf will arrive first at his house) is frantically increasing his rate
asked by Yoona 
Math Problem
perform the indicated operation and simplify please help. (v5)/(v6)(v+1)/(v+6)+(v18)/(v^236)
asked by Lavern 
Child Day Care
10. How would an authoritative caregiver most likely solve the problem between Carlos and Thomas? A. Help Carlos to refill his bucket. B. Ask Carlos if Thomas can play too. C. Ignore the situation and let the boys resolve it. D. Tell Thomas he was bad to
asked by kiki 
Math Help Plz
The point (3,8) is on the terminal arm of the angle x. Find sinx exactly and find x, in radians, to two decimal places. I don't how I should start this question. please help and thank you
asked by Anonymous 
chemistry
what would the pressure of H2 gas collected in lab over water at 20.0 degrees celcius and 767 torr?
asked by kim 
math
Tristan is having a birthday party. He doesn’t want anyone less than 10 years old to come to his party. If y equals age in years, which number sentence expresses his age requirements? A. y < 10 B. 10 = y C. y 10 D. 9 > y
asked by MS.SUE I NEED HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 
healthcare
What changes in client care needs would you report?
asked by Lisa 
Biology
Where is the Barnacle zone located in a rock platform ecosystem(Upper littoral, upper midlittoral, lower midlittoral or lower littoral zone)?
asked by Jason 
science
why does cobalt chloride strip turn pink or blue?
asked by kayla 
Biology
I estimated a possum population to be 260. It was later found that the possums rather enjoyed being trapped because of the tasty food used as bait. Does this mean the population estimate may be too high or too low?
asked by Paula 
Math
What is the probability of getting the sum of 7 on two die on the first roll?
asked by Michelle 
MATH
The number of students who ride a bike to school is 15 more than the number of students who walk to school. The letter s represents the number of students who walk to school. Which of these shows the number of students who bike to school? A. s – 15 B. 15
asked by PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!PLEASE!!!!!! 
Social Studies
What are the 4 Border States?(five if you include West Virginia:1863)
asked by Rezu 
Chemistry
An aqueous solution is 0.257 m NaOH. What are the boiling point and freezing point of this solution?
asked by MJ 
Math
1. Abundance of starfish on a rock platform was studied by the quadrat method. The quadrat was a plastic frame with an area of 0.25 meter square. The rock platform was a rectangle approximately 20m x 30m. The numbers of starfish in 10 quadrat "drops" were:
asked by MaebelXD 
math
what is increase 45 by 9 not using percent?
asked by cruz 
APWH
thesis: How did the World Wars of the 20th century demonstrate the application of “total war?”
asked by Becca 
APWH
thesis: How did the World Wars of the 20th century demonstrate the application of “total war?”
asked by Becca 
Types of Business writing
Revised ...Let me know if it's ready for submittance: TO: Deb.Walker CC: Jeremy.Dittmer@; m_hopkins@ SUBJECT: Sexual harassment and unlawful discrimination in the workplace seminar Dear Deb: I would like to confirm our arrangements for our seminar about
asked by Shawna 
Intermediate Algebra
Show all work. Find the quotient:49a^2b^2/7ab
asked by Ciara 
algebra 2
to determine the number of deer in a game preserve a conservationist catches 330 deer tags them and lets them loose later 672 deers are cought 168 of them are tagged how many deer are in the preserve I don't now how to get the answer can someone work this
asked by karon 
science
What is the average speed of a car that travels 320km in 3.5 hours?
asked by Britt 
math
If you invest $17,000 a year for 11 years, at 4% compounded monthly, what would the balance be at the end of 11 years?
asked by Linda 
Intermediate Algebra
what is the sqr of(24)
asked by sherry 
Chemistry Question (elements)
Indicate which of the following elements do not exist in nature in the elemental state (that is, they only exist in the combined state of being in compounds with other elements): Cl, K, S, Al, Ar, N A. S, Ar, N B. Ar only C. Cl, K, Al D. Cl only E. Cl, K
asked by M 
Chemistry
How to find [H3O+] when i have [OH]?
asked by Saphire 
Improving your writing
BACKGROUND: Ten years ago, I started working as a clerk for DMD Medical Supplies. Six months ago, Liz, the human resources director, promoted me to office manager. I manage two employees: Jack and Ruth. My office provides secretarial support for the four
asked by Kayla 
accounting
March 15 Received $2,500 partial payment on a $5,000 accounts receivable balance. Wrote off the rest of the account as uncollectible.
asked by Jan 
accounting
Journalize: March 15 Received $2,500 partial payment on a $5,000 accounts receivable balance. Wrote off the rest of the account as uncollectible.
asked by Jan 
Economics
Why has welfare been decreasing in Canada over the years?
asked by Labz 
computer science
May I found someone help me in gnu octave program? thanks
asked by umahmed 
accounting
I need HELP in journalizing the following please: February 1 Paid $3,750 accounts payable balance due to a supplier. March 15 Received $2,500 partial payment on a $5,000 accounts receivable balance. Wrote off the rest of the account as uncollectible. April
asked by Jan