Questions Asked on
January 21, 2013

Math
If the surface area of a certain body of water is 200 ft ^2 and the surface area to volume ration is 1:13; what is the volume of the body of water? I can't figure out the formula and answer to this problem.
asked by Diana M 
statistics
Using the central limit theorem, construct a 95% confidence interval for the average total cry time for infants in the control group and infants in the intervention group. For this question only, assume that the standard deviation of cry time within each
asked by Gavin 
Algebra II
Which of the following is a function? A) x^2 + 2y^2  4 = 36 B) {(6, 5), (1, 5), (4, 5)} C) {(5, 4), (5, 3), (3, 6)} D) x = y^2  3
asked by Piggy 
Chemistry
Can someone please help me out here? I've tried several times and i keep getting the wrong answer :( lol A small crucible is filled with 100.00 mL of nhexadecane (MW (226.44 g/mol), density (0.7703 g/mL)) and 2.10 L of 7octenyltrichlorosilane (MW (245.65
asked by Tawnya 
clinical chemistry
how many militers of a 2.0M solution is required to prepare 50ml 0f a 0.3M solution
asked by Anonymous 
math
3x^2+5x1 can any1 solve this by partial factoring?
asked by Anonymous 
Structure
no one would have attended the lecture if you told truth about the guest speaker
asked by sari 
Math
Find h(t) + k(t) if h(t) = {(4,5), (2,3), (0,5), (1,3), (3,1), (5,5)} and k(t) = {(3,2), (2,6), (1,0), (1,0), (2,6), (3,5), (4,0), (6,2)}. (2 marks)
asked by Anonymous 
solid mensuration
find the area of a regular pentagram if one of the sides of inner pentagon is 3cm
asked by alysa 
solid mensuration
the perimeter of an ellipse with an area equal to 12pi square units if the non opposite vertices are 5units apart
asked by alysa 
physics
A car starts from rest and travels for 7.0 s with a uniform acceleration of +2.3 m/s2. The driver then applies the brakes, causing a uniform negative acceleration of 1.0 m/s2. If the brakes are applied for 2.0 s, how fast is the car going at the end of
asked by Anonymous 
Anatomy and physiology
1)Why is enzymatic catalysis essential for life? Describe in detail the mechanism for enzyme mediated anabolic and catabolic reactions. What are the various modes of inhibition. 2) "every energy transfer increases the entropy of the system" .why? (hint
asked by Heather 
Chemistry
Can someone please help with this problem and explain it please? If soil has a density of 1.32 g/cm cubed, then what does 1.0 cubic yards of soil weigh in pounds?
asked by Sally 
Analytic Geometry
What are the equations of the circles tangent to the xaxis, of radius 4 and whose center is at (2,y) Please help, how do I solve this problem?
asked by Lance 
Math
Find the no. of terms 1. 3,5,7...33 2.5,1,3,...75 Solve each problem. 1. In the Arithmetic sequence 5,8,11,14.... what is n if a sub n is 32? 2.Find the sum of the first 20 terms of the arithmetic sequence 15,7,31,43...
asked by Aliza 
physics
A 25 mF capacitor is connected to a source of potential difference 100V. What is the resulting charge in the capacitor?
asked by rubi 
mathsurgently needed
the simple interest of certain amount for a period of 2 years is 400 . the compound interest for the same amount for the same period is 410. find the principal and rate of interest?
asked by Anonymous 
urgent i need help within an hour!
Ascorbic acid (vitamin C, C6H8O6) is a watersoluble vitamin. A solution containing 83.3 g of ascorbic acid dissolved in 210. g of water has a density of 1.23 g/mL at 55°C Calculate the molarity of ascorbic acid in this solution. i got 2.77 but its wrong
asked by Samantha 
Computer Science
I need help with this question please! Please write me step by step instructions or how should I begin the problem. Thank you for your time ;) Write a function that takes an array and returns true if all the elements in the array are positive, otherwise,
asked by nutz 
Chemistry
Dr. Bob222, Please see my additional posts on Jan 20 at 2:26pm and Jan 21 at 12:33 am. This is in reference to the redox reactions: 1) Fe goes from +2 to +3, and S goes from 2 to +6. They both appear to be oxidized because they increased. Is it possible
asked by Sushmitha 
Physics
A jeep has a speed of 50 m/s at a given instant and 10 m/s later. fin its retardation, assuming it to be constant.
asked by Matt 
Physics
A car starts from school gaining a speed at the rate of 2 km/min/sec. how long will it take to nave a speed of 50 km/min?
asked by Matt 
Acceleration
A toy car moves down an incline with an acceleration of 20 cm/s/s. what will its velocity be in 5 sec? what distance will it have traveled..?
asked by Matt 
Math
What acceleration will cause a bus to travel a distance of 200 meters in 10 sec if it starts from rest
asked by Matt 
math
Daniel needs to purchase 5.6 meters of tape for a project. If each roll of tape contains 80cm andcosts $2.50, what is the total cost of the tape Daniel must buy? x=cost of tape meters of tape/cost 5.6/x=.8/2.5 x=17.5 I have the cost is $17.50 Is this
asked by b6 
need help for chemistry
Account for the following observation: 1)Ammonia is exceptionally soluble in water. 2)Hydrogen fluoride ,HF, has a higher boiling temperature than methane, CH4. 3)The boiling temperature of ammonia (NH3)is 33˚C but that of phosphine (PH3) is 88˚C
asked by Danial 
College Algebra
I need some help with a handful of questions. I need to see the steps on how to get to the final answers. I would also appreciate if you can explain how you got to those steps. Rationalize each expression by building perfect nth root factors for each
asked by Krissy 
Math
2x3y=6 I did +3y 2x=6+3y 1/2 to both sides(2x=3y/2+6) x=3/2y+6 or does the 1/2 go under the hole equation 0f3/2y+6 making the answer x=3/2y+3 Thanks
asked by Liz 
Chemistry
This problem is 1st order for half life. How long would it take for the concentration of cyclopropane to decrease to 50% of its initial value? to 25% of its initial value? Rate constant is 9.2/s I set up like this... t1/2= 0.693/9.2/s= 0.075s at 50% I
asked by Chris 
English
Can you explain to me what this means: "First thoughts are also unencumbered by ego, by that mechanism in us that tries to be in control, tries to prove the world is permanent and solid, enduring and logical."
asked by Wade 
Chemistry
calcium carbonate decomposes if heated to form calcium oxide and carbon dioxide. if 24.5 grams of calcium carbonate decompose how many moles of calcium carbonate reacted?
asked by Channon 
chemistry
Calculate the molarity and molality of 37.0%(w/w) HCI with a density of 1.19 g mL1.The molecular mass of HCI is 36.46 g mol1.
asked by rohaya 
physics
what countries use both metric and nonmetric system
asked by metric and nonmetric system 
Physics
I've been stuck on this equation for a while and I don't know if i'm missing a key part to the equation.. i just need help! If the gravitational field strength at the top of Mount Everest is 9.772 N/kg, approximately how tall (in feet) is the mountain? F=
asked by Larry 
Math
How do I write four equivalent expressions for 50+225
asked by Anonymous 
biology
how can u investigate sugars or starch in a banana
asked by leah 
chemistry help !!!!!!!!!!!!!!!!
Identify 4 functional group: O  HO CH2 C \ / \ / \ Benzen ring CH OH /  HO NH2 1)carboxylic acid functional group 2)amine functional group 3)alcohol functional group i only know three is anyone can tell me the last functional group.please
asked by john 
chemistry help !!!!!!!!!!!!!!!!
Identify 4 functional group: HOHOBENZENE RINGCH2CHNH2C=OOH 1)carboxylic acid functional group 2)amine functional group 3)alcohol functional group i only know three is anyone can tell me the last functional group.please
asked by john 
goemetry
Determine AU(C'UB') U= {a,b,c,d,e,f,g,h,i,j,k} A= {a,c,d,f,g,i} B={b,c,d,f,g} C={a,b,f,i,j)
asked by carol 
english
I am to create a timeline that illustrates the history of children's literature in western culture using five key milestones of children's literature. Can you please tell me if these milestones I have chosen would be correct to use: 1invention and
asked by m 
chemistry
What would be the concentration of dinitrogen pentoxide after 6.00 X 10(2) seconds and how long would it take for the concentration of N2O2 to decrease to 10.0% of its initial value in the following equation... N2O5 to NO2 and O2 initial concentration is
asked by Chris 
geometery
please walk me through this I am having a hard time with this A survey of 500 showed the following 15 had only camping 20 had only hiking trails 35 had only picnicking 185 had camping 140 had camping and hiking trails 125 had camping and picnicking 210 had
asked by carol 
AP Chemistry
how much heat is produced when the body metabolizes a gram of trioleylglycerol? I know that the combustion of triolelglycerol is exothermic with an enthalphy change of 9 calories per gram of trioleylglycerol molecules, so the combustion will release heat
asked by Timofey 
Math
Find h(t) + k(t) if h(t) = {(4,5), (2,3), (0,5), (1,3), (3,1), (5,5)} and k(t) = {(3,2), (2,6), (1,0), (1,0), (2,6), (3,5), (4,0), (6,2)}.
asked by Anonymous 
Spanish Check??
A. Choose between the preterite or the imperfect. We wanted to buy the car. QuisimosQuer�amos comprar el auto. � The man refused to speak. El hombre no quisono quer�a hablar. � They found out the news yesterday. SupieronSab�an las noticias ayer.
asked by Victoria 
Mathematics
Solv.A (5,3) B (9,7)
asked by Cordelia 
Physics
A football punter accelerates a football from rest to a speed of 9.1 m/s during the time in which his toe is in contact with the ball (about 0.247 s). If the football has a mass of 484 g, what average force does the punter exert on the ball?
asked by Lindsey 
Chemistry
Suppose a student started with 128 mg of transcinnamic acid and 0.52 mL of a 10% (v/v) bromine solution, and after the reaction and workup, ended up with 0.184 g of brominated product. Calculate the student's theoretical and percent yields. what are the
asked by UCI KID 
algebra/trigonometry
x+5 over 7 divided by 4x+20 over 9
asked by Mary 
algebra 1
what steps someone would take to use your method (substitution) and a clear argument stating the reason why your method is better than the other ones. (in other words, come up with a few good sentences that explain why you choose your method and why others
asked by da 
algebra
Jill is 2 years older than Mike. in 5 years, 5 times Mike's age will be 4 times Jill's age. how old is Mike? Write an equation that models how old in years each of you will be, when your ages add up to 150 years old. For example, if x = your age and the
asked by Anonymous 
math
A 6ft man stands next to a 100ft. tall building. the man's shadow is 8ft. long. How long is the building's shadow?
asked by veronica 
Algebra 1
You have $6000 to invest in two stock funds. The first fund pays 5% annual interest and the second account pays 9% annual interest. If after a year you have made $380 in interest, how much money did you invest in each account?
asked by Mbaintu 
Math
What are three differences between an inconsistent system and a consistent and independent system? Explain.
asked by Anonymous 
Science
A 35 kg child starting from rest slides down a hill with a vertical height of 20m. What is the child's speed at the bottom of the hill? How do you solve this???
asked by Pascha 
math
Which of the following numbers are equivalent to 20%? Choose all that apply. Which of the following numbers are equivalent to 35%? Choose all that apply. Which of the following numbers are equivalent to 8%? Choose all that apply Select the answer that
asked by Anonymous 
Math
The region bounded by the given curves is rotated about the specified axis. Find the volume V of the resulting solid by any method. y = −x^2 + 14x − 45, y = 0; about the xaxis
asked by Em 
physics
A bat emits a sound whose frequency is 83.6 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 36.0 oC, so the speed of sound is not 343 m/s. Assume that air behaves like an ideal gas, and find the wavelength of the sound
asked by Anonymous 
Math
Find the volume V of the described solid S. The base of S is a circular disk with radius 4r. Parallel crosssections perpendicular to the base are squares.
asked by Em 
Math
Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line. y = (64 − x^2)^(1/4), y = 0, x = 6, x = 7; about the xaxis
asked by Em 
algebra 2
HOW DO I CHANGE 176FT^3 TO YD^3 I AM STUCK
asked by bernie 
Math
Write an equation: x varies directly as y and inversly directly to the cube of Z
asked by Sara 
algebra
approximately how far can bobby drivein 2,3,4,and 5 hours
asked by fred 
algebra 1
(4xcubed+6x+1)+(5xsquaredx12)
asked by back 
algebra
The difference between two numbers is 18. If the sum of three times the smaller number and half the larger number is 2, find the smaller number.
asked by juan 
algebra
graph the following linear equations and determine the correct classification: L1:y=x+5 and L2:y=2x+1
asked by juan 
PreAlgebra
For an account that earns interest compounded annually, find the balance on the account to the nearest cent.
asked by Anonymous 
algebra
A pharmacist has 40% and 60% iodine solutions on hand. How many liters of each iodine solution will be required to produce 4 liters of a 50% iodine.
asked by juan 
Physiology
How are Lower Body Negative Pressure and hemorrhage similar and different?
asked by Lindsey 
ALGEBA 1B
CAN YOU HELP WITH A FORMULA FOR A RIGHT ANGLE WITH A SIDE OF 24KM A LEGENHT OF 25KM AND A BASE B
asked by bernie 
math
a cylindrical soup can has a radius of 4.1 inches and a height of 2 inches. find the volume of this can in terms of pi
asked by Anonymous 
math
2x^3+4x^23x^26x when x=3 I did2(3)^3+4(3)^23(3)^26(3) 2(27)+4(9)3(9)6(3) 54+362718 902718 6318 45 is this correct? Thanks
asked by b6 
algebra 1
what steps someone would take to use your method (substitution) and a clear argument stating the reason why your method is better than the other ones. (in other words, come up with a few good sentences that explain why you choose your method and why others
asked by da 
Algebra 2
The Formula s= sqrt 30fd can be estimated the speed of s, in miles per hour that a car is traveling when it goes into a skid, where f is the coefficient of friction and d is the length of the skid marks in feet. Kody skids to a stop on a street with a
asked by Ana 
Physics
A football punter accelerates a football from rest to a speed of 9.1 m/s during the time in which his toe is in contact with the ball (about 0.247 s). If the football has a mass of 484 g, what average force does the punter exert on the ball?
asked by Lindsey 
History
What changes in England were steps toward representative government?
asked by Karen 
math
Which set of integers is not closed under what operation? +  x Division I thought it was division but I don't understand , can you please explain this. Thanks
asked by b6 
URGENT MATH
Find h(t) + k(t) if h(t) = {(4,5), (2,3), (0,5), (1,3), (3,1), (5,5)} and k(t) = {(3,2), (2,6), (1,0), (1,0), (2,6), (3,5), (4,0), (6,2)}. (2 marks)
asked by Anonymous 
algebra
A pharmacist has 40% and 60% iodine solutions on hand. How many liters of each iodine solution will be required to produce 4 liters of a 50% iodine. 1. iodine1 = 2, iodine2=2 2. iodine1 = 21, iodine2 = 21 3. iodine1 = 41, iodine2 = 41 4. iodine1 = 41,
asked by juan 
Logic
Situation 1: You have eight billiard balls. One of them is "defective," meaning that it weighs more than the others. How do you tell, using a balance, which ball is defective in two weighings? Situation 2: You have five jars of pills. All the pills in one
asked by Sarah 
physics
A 95 kg fullback is running at 7.5 m/s to the east and is stopped by a headon tackle by a tackler running due west a 12.4 m/s. What is the mass of the tackler?
asked by Anonymous 
History
which term suits this sentence:  often led to corruption, as some officeholders helped themselves to public money. Fill in the blank with one of these terms: labor unions, Grover Cleveland, Patronage, Chester Arthur, wealthy men, or James Garfield
asked by Rebecca 
Chemistry
Please help.Any type of help would be nice. 1.Explain the spectrum of 1methylstyrene. 2.Explain the gaseous and solid state PCl5 from its IR and Raman spectra.
asked by Anonymous 
College Algebra
I'm wondering how to answer this. The conjugate of 2Square root 3 is?
asked by Krissy 
Physics
Car A with mass of 1250 kg is traveling at 30 m/s to the east. Car B is a truck with mass of 2000 kg, traveling to the west at 25 m/s. Assume these two vehicles experience an inelastic collision but do not stick together and car a goes off 10 m/s to the
asked by Mauro Dar 
social studies
What is Delaware home to?
asked by Anonymous 
Math
1. Find the area of a segment of height 22.1 inches in a circle of radius 6.42 ft. Draw a rough sketch of a circle showing the height and radius. Consider significant digits.
asked by Prince 
Math
2. A propeller on a gas turbine rotates 64° every 2.70 minutes. What is the angular velocity in rev/s? What is the linear speed of a point at the tip of the blade if the diameter of the blade is 5.37 ft?
asked by Prince 
History
One major concern people had was that  were controlling politics at the expenseof the public good. Fill in the blank with one of these terms: Labor unions, Grover Cleveland, Chester Arthur, wealthy men, or James Garfield. I think that it is either
asked by Rebecca 
Math
Draw the graph of the following function on the given interval. [4 marks] y=1.8cos(2x+〖30〗^o ) 〖180〗^o≤x
asked by Prince 
Physics
Why does the volume of air bubble increase as it rises toward the surface?
asked by Shane 
math
This is for Ms. Sue ! 0.002,1/4,0.20,1/5 my answer 1/5 and 0.20 7/20,6/20,3.5,0.35 my answer 3.5 0.008,0.08,2/25,1/12 my answer 0.08 14%,1/8 , 0.065, 0.03 0.065, 0.03,1/8 , 14% 0.03, 0.065, 1/8 , 14%, my answer C 0.03, 0.065, 14%, 1/8 7/14,2/5 , 32%, 0.25
asked by Anonymous 
physic 108
A charged nonconducting rod, with a length of 3.83 m and a crosssectional area of 5.69 cm2, lies along the positive side of an x axis with one end at the origin. The volume charge density ρ is charge per unit volume in coulombs per cubic meter. How many
asked by k 
College Algebra
The expression x^27 is not factorable using integer values. But the expression can be written in the form X^2(Square root7)^2 enabling us to factor it as a “binomial” and its conjugate: (x+square root 7)(xsquare root 7) Use this idea to factor the
asked by Krissy 
Physics
True or false?equal masses of two different gases placed in containers of equal volume at equal temperature must exert equal pressures
asked by John 
algebra 2 trig HELP TEST TOMMAR
sam and nikki lie 206 km apart. at 8:00 am. sam started driving to nikki's house at 60km/hr. at 10:00 am nikki started driving to sam's house at 82 km/hr. at what time will they be 15 km apart?
asked by river 
organic chemistry
I really need help with this question. It is located at the link below. Question #2. I understand the general reaction but I need help with the actual mechanism. Olopatadine is a drug used topically to treat the itching associated with conjuctivitis It is
asked by ha 
math
Ok ! Hi Ms. Sue can you explain to help me with this ! Please....
asked by Anonymous 
social studies
why did the shipbuilders choose coastal locations such as Portsmouth for shipbuilding?????? HELP!!!!!
asked by Anonymous 
Analytic Geometry
Give the equation of the circle tangent to both axes of radius 5 and in the 1st quadrant. Can you help me solve this?
asked by Lance 
algebra
Solve the problem. During a hurricane evacuation from the east coast of Georgia, a family traveled west. For part of the trip, they averaged but as the congestion got bad, they had to slow to If the total time of travel was 7 hours, how many miles did they
asked by Anonymous 
math ugh"
A class has 21 students . 10 boys and 11 girls . What fraction of the class is made up of boys
asked by Anonymous 
Computer.....
Is there a way to erase something on the computer when for example there is a huge word lying across something?
asked by Anonymous 
science
Is hot cocoa considered thermal energy when it is really hot with steam coming out?
asked by Harry Please Helppp 
chemstry
Classify six kinds of amino acids according to the functions that they serve in the human body, stating an example for each class.
asked by zachary 
math
Ms. Sue im the person that posted at 1:58 ! Can you please explain, instead of wrong or right,
asked by Anonymous 
ss
1. To the north, Canada borders the (1 point) Atlantic Ocean. Pacific Ocean. Arctic Ocean. North Sea. 2. Volcanoes produced the Cascade Mountains of Washington and Oregon. What is the name of the peak that had a powerful eruption in 1980? (1 point) Mount
asked by tesj 
physics
After landing safely on the target the cat tries another projectile apparatus. This time the cat is shot out of a cannon over a 30 m high wall. The cat is launched at an angle of 55º0 and can be assumed to be at ground level during launch. With what speed
asked by luellen 
Chemistry
A 45kg sample of water absorbs 364kJ of heat. If the water was initially at 28.2 Celcius, what is its final temperature? How do I figure this out....HELP!
asked by Final Water Temperature 
English
How would you reword this sentence to make it easier to understand? In other words, giving up results in goals much harder to achieve, thus persevering really makes a difference.
asked by Anonymous 
chemistry help !!!!!!!!!!!!!!!!
Benzoic acid react with NH2 group Draw the product of this reaction, name the new functional group produced, state the type of reaction that has occurred, name any other products of the reaction and briefly explain how you arrived at your answer.( one or
asked by john 
physics
The speed of a car moving in a straight line increases every second. It goes from 30 km/hr (about 19 mi/hr) to 35 km/hr (about 22 mi/hr) in the first second. The next second, it goes from 35 km/hr to 40 km/hr (about 24.8 mi/hr). What is its acceleration?
asked by Anonymous 
science
Is hot cocoa considered thermal energy when it is really hot with steam coming out?
asked by Harry Please Helppp 
social studies
A)How did corruption in city government grow? B) How did people react to this corruption? PLEASE HELP! i have a test tommorrow and this is our essay question and i cant find it in the book!!!
asked by MS. SUE PLEASE HELP! 
Science
How do you create a bar graph for science?
asked by Jessica 
fractions !
In a neighborhood 10 houses are for sale and 53 are not for sale. Write a fraction representing the portion of houses that are for sale
asked by Anonymous 
Politics
what is significance of Machiavelli in politics ?
asked by luellen 
Math
Solve each equation. 2x + 1 = 7 4t + 5 = 21
asked by Anonymous 
real estate
Mile and Rosalyn borrow $70,000 to purchase a home. If the monthly interest payment is $787.50. What is the rate of interest?
asked by kristina 
Physics
A 2kg object is attached to a spring and undergoes simple harmonic motion. At t=0 the object starts from rest, 10 cm from the equilibrium position. If the force constant of the spring k is equal to 75 N/m, calculate a. the max speed b. the max acceleration
asked by Mary 
8th Grade History
which group best fits this sentence: groups: African Americans, Asian Americans, Mexican Americans, Native Americans Sentence: Many members of this group turned dry, barren lands into profitable farms. Others worked in lumber mills, canneries, and mines
asked by AnnE 
Chemistry
In the first order, reaction A yields products, A=0.400M initially and 0.250M after 15.0 min. What is the value of the rate constant, k?
asked by Jeremy 
algebra2
Step by step explainations on how to graaph a parabola using a table of values.
asked by Ziah 
Algebra
Write a piecewise function that is equivalent to (x)= 2/x2/
asked by Alexys 
chemistry
An ideal gas CANNOT be what?
asked by Anonymous 
math
How would I write 2 inequalities that describe in basketball that 2 points = field goal and 1 point = free throw and I have scored at least 3 points in every game this season and 15 points for the most points in one game? Please Explain! I don't
asked by Katie 
English
I am reading an article about Britney Spears leaving the XFactor. On of the lines says "she wasn't a great judge, but she didn't shave her hair off or anything, so she proved herself capable of keeping together." I feel like this might be a logical
asked by Jackie 
Discrete Math
Find z so that 5% of the area under the standard normal curve lies to the right of z. the answer according to the book is 1.645, anyone got any ideas on how to get this?
asked by Jessica 
social studies
In what ways are a KNights code of chivalry similar to an oath of allegience?
asked by bethany 
math
income 1000 2000 3000 taxes 200 350 450 what percentage of income is paid in taxes at each level?
asked by karen 
physics
What is the apparent weight of a lead brick 2.0 in x 2.0 in x 8.0 in if placed in oil with density p=0.93 g/cm^3 (Ppb=11.4 g/cm^3)(1 in. = 2.54 cm)
asked by Shane 
English (APA)
How do I cite APA style when you don't have the author or when you don't have the date? I need help with this I don't feel like the citation machine I am working is doing it right and I want to know how to do it. Thanks!
asked by Amy 
Math
Chas used 3 1/4 cups more cranberry juice than grape juice to make a fruit drink. He planned to make a total of 9 1/4 cups of the drink. How much did Chas use of each juice?
asked by Anonymous 
Math
Explain how to find 14 x 19 by breaking apart the factors in tens and ones and finding the sum of the four parts
asked by Prince 
Chemistry
The nuclide 96Nb decays by a firstorder process with a rate constant of 2.96 × 102 h1. How long will it take for 85% of the initial amount of 96Nb to be consumed? I believe it is 5.07 hrs...
asked by Jeremy 
Chemistry
Thyroxine, an important hormone that controls the rate of metabolism in the body can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution could be measured as 5.144°C. Pure
asked by Emma 
Physics
A 250 g object attached to a spring oscillates on a frictionless horizontal table with the frequency of 4 Hz and an amplitude of 20 cm. Calculate a) maximum potential energy of the system b) the displacement of the object when the potential energy is
asked by Rose 
Physics
Two springs are attached side by side to a green box of mass M. Determine an expression that describes the period of motion of the box attached to this combination of springs. The two individual springs have spring constants K1 and K2 respectively.
asked by Rose 
social studies
what are craft guilds similar to today?
asked by bethany 
Math
Erika eat 1/3 of a chocolate bar and gave the remaining 2/3 of the chocolate bar to her 8 friends to share equally. How much chocolate bar will each friend get?
asked by Cherl 
Physics
A simple pendulum of the length 0.350 m starts from rest at a max displacement of 10 degrees. from equilibrium position. a) At what time will the pendulum be located at an angle of displacement of 8 degrees? b) When will the pendulum return to its starting
asked by Derrick M. 
Physics
A thin rectangular piece of aluminum (density is 2700 kg/m3) is designed to pivot about a pin that smoothly slides into a small hole. Where should the hole be drilled in order to minimize the period of harmonic motion? The aluminum has dimensions of 2 cm x
asked by Derrick M. 
physics
An aircraft flying at a steady velocity of 70m/s eastwards at height of 800m drops a package of supplies a)express the initial velocity of the package as vector. B)how long will it take for the package to reach the ground? C)how fast will it be going as it
asked by Minte 
chemistry
Determine the mass of CO2 gas that has a volume of 7.10 L at a pressure of 1.11 atm and a temperature of 31.0°C.
asked by Abi 
Science
Could mechanical energy be when you throw something? Pleaseeee help me.
asked by Angie Please Help Me! 
social studies
Whatsocial changes came as a result of increased trade?  I already have a few like towns, new powers, new freedoms, and weakening of feuldalism. Is there anything else I missed?
asked by bethany 
Spanish
Les vas a dar muchos regalos a tus padres. Quiero comprarles unos guantes a mis sobrinos Clara va a venderle sus libros de literatura francesa a su amiga. Los clientes nos pueden pagar con tarjeta de crédito
asked by Anna 
College Algebra
The load L a horizontal beam can safely support varies jointly as the width w and the square of the depth d and inversely as the length l. If a 12foot beam with width 6 inches and depth 8 inches safely supports 600 pounds, how many pounds can a 14foot
asked by Audrey 
math
48 alegators if 5/6 were asleep how many wera awake
asked by Anonymous 
Chemistry/Normal Distributions/Math
I'm confused on how to calculate the standard deviation for this... The 95% confidence limit for calcium in control sera is reported as 9.210.2 mg/dl. Calculate the value for one standard deviation and the coefficient of variation for this data.
asked by Maranda 
Finance
A trust has the purpose of:
asked by Raymond 
math
Express Courier Service has found that the delivery time for packages is normally distributed with mean 14 hours and standard deviation 2 hours. What should be the guaranteed delivery time on all packages in order to be 95% sure that the package will be
asked by Jessica 
Chem
If a 930cm3 piston compresses the air in the cylinder to 1/8 its total volume, what is the pressure after the gas is compressed?
asked by Ashley 
ENGLISH !(:
Which of the following is an independent clause? Where Juan lived. Because Juan was brave. Juan's favorite adventure. Juan explored the cave. Which of the following groups of words is a clause? to learn a new language around the corner waiting for the bell
asked by Anonymous 
chemistryredox
Can two elements both be oxidized in a reaction? 2FeS + 4.5O2 +2H2O==> Fe2O3 + 2H2SO4 I see Fe is oxidized, going from Fe+2 to Fe+3 However, Isn't S going from S2 to S+6? making sulfur ixidized too, and not reduced?
asked by Sushmitha 
Math
If it snowed 7 days in the month of December in Wisconsin, what percent of the days in December did Wisconsin get snow?
asked by Wade 
Physics
A GPS satellite orbits at an altitude of 2.0 x 10^7 m and a speed of 3.9 x 10^3 m/s, Earth’s radius is 6.4 x 10^6 m, and a point at its equator has tangential speed of 460 m/s, By approximately what fraction must the time be adjusted to account for both
asked by Katie 
Statistics
does some one mind checking my work? it's real simple Stats vocab. thank you! Determine whether the given description corresponds to an observational study or an experiment: (just as a refresher, observational means passive and experiment means active)
asked by Gavin 
Math
Compute the following special functions. Keep the correct number of significant figures. 10^5.4 Can somewhere help me with this? Is it as simple as putting it into my calculator just like that? if so, how do I know what the correct number of sig figs are
asked by carl 
Math
For a binomial distribution with n=20 trials and probability of success p=.05, we let r= number of successes out of 20 trials. Use the normal approximation to estimate P(6
asked by Leanne 
alg/trig
9/x + 9/x2= 12
asked by christina 
chemistry
An analysis for copper was performed on two pure solids. One solid was found to contain 43.0% copper; the other contained 32.0% copper. Could these solids be samples of the same coppercontaining compound? Please help.
asked by Anonymous 
Statistics
I have a question about one of my Stats vocab questions. any help is great. thanks! Identify the type of observational study as either Crosssectional or retrospective (just a reminder, Crosssectional is data measured at one point in time, retrospective
asked by Gavin 
chemistry
Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 19.9 g of biphenyl in 34.3 g of benzene?
asked by Brianna 
RE: Math Urgent
I posted this earlier but I think I phrased it in a confusing way Find g(x) + g(x) if g(x) = {(4,5), (2,3), (0,5), (1,3), (3,1), (5,5)} and g(x) = {(3,2), (2,6), (1,0), (1,0), (2,6), (3,5), (4,0), (6,2)}. I don't need the whole thing done i'm
asked by Anonymous 
american government
judicial review is the power of the american courts to:
asked by melissa 
Statistics
I have another Stats question i'm confuesed on. classify the sample as random, systematic, covenience, stratified, or cluster. A marketing executive fo General Motors finds that its public department has just printed envelopes with the names and addresses
asked by Gavin 
Physical Science
The distance from earth to the sun is 1.5x10 to the 11th power minutes and light travels at a speed of 3.0x10 to the 8th power m/s. How long does it take sunlight to reach the earth? Give answer in minutes and seconds.
asked by Belaune 
chemistry
You have 37.0 mL of a 3.00 M stock solution that must be diluted to 0.500 M. How much water should you add?
asked by Brianna 
math
mary is x years old. it is her birthday today. her sister, sherry is 4 years older than she is. after 7 years their combined age will be 24 years write a liner=ar equation for their combined age after 7 years
asked by Anonymous 
Anatomy
why is enzymatic catalysis essential for life? Describe in detail the mechanism for enzyme mediated anabolic and catabolic reactions. include in your answer various modes of inhibition.
asked by Ally 
matH
casper bought some pencils at .50 cents each. he had $3.00 left after purchase. if he wanted to buy the same number of notep[ads at .80 cents each he would be short $1.50 write a linear equation for the number of pencils he purchased. Solve
asked by Anonymous 
Math
Kathy drove from Dry Creek to Cactus, a distance of 250km. She increased her speed by 10km/h for the 360km trip from Cactus to spur. If the total trip took 1 hours, what was her speed from Dry creek to Cactus.
asked by Emme 
Physics
A football punter accelerates a football from rest to a speed of 9.1 m/s during the time in which his toe is in contact with the ball (about 0.247 s). If the football has a mass of 484 g, what average force does the punter exert on the ball?
asked by Lindsey 
Physics
A ball thrown horizontally at 22.76 m/s travels a horizontal distance of 46.81 m before hitting the ground. From what height was the ball thrown?
asked by Student 
Math
The algebraic relation d= 0.0056s2 +0.14s models the relation between a vehicle's stopping distance d, in metres and its speed s, in km/h. a) What is the fastest you could drive and still be able to stop within 80m? b) What is the stopping distance for a
asked by Emme 
Math 7A
Use the function rule, y = 2x + 5, to find the values of y when x = 1, 2, 3, and 4. Write the answers as ordered pairs that would be used to graph the function. can someone help me i'm stuck on this question
asked by katie 
Science
Please compare and contrast the electrochemical events involved in the initiation and propagation of an action potential with the electrochemical events involved with the initiation of muscle contraction in skeletal muscle. Be sure to describe the
asked by Jack 
math
translate and simplify"six less than twice the sum of a number and three" choices are A)2x b)2x c)2x+9 d)2x3 I set it up 2(x+3)6 2x+66 answer=2x Is this correct Thanks
asked by ES 
Physics
A sailor climbs to the top of the mast, 12.55 m above the deck, to look for land while his ship moves steadily forward through calm waters at 4.63 m/s. Unfortunately, he drops his spyglass to the deck below. Where does it land with respect to the base of
asked by Student 
ANTHROPOLOGY
Both reciprocal and redistributive exchanges exist in modern industrial society.
asked by Anonymous 
English
I have to do a paragraph due Wednesday. Could someone please read it and point out any unclear, vague, or wordy points? Throughout Langston Hughes' poem "Mother to Son," the speaker sympathizes with the reader regarding the difficulty of life. For example,
asked by Anonymous 
Math
I need to translate to an algebraic expression. The product of two numbers multiplied by 3.
asked by Irene 
MATHEMATICS
Suppose you won a contest at 9th grade start that deposited $3,000 in an account that pays 5% annual interest compounded continuously. You go to college for four years (four years later). How much will you have then?
asked by Chencho el chancho choncho 
probability
suppose that the times taken to complete an online test are normally distributed with a mean of 45 minutes and a standard deviation of 12 minutes. find the probability a. that for a randomly selected test, the time taken was more than 1 hour. b. that the
asked by Jennifer 
Physics
During 200 meter and 400 meter races, runners must stay in lanes as they go around a curved part of the track. If runners in two different lanes have exactly the same speed, will they also have exactly the same centripetal acceleration as they go around a
asked by Kayla 
Physics
A chartered airplane flies 100 km east, then 350 km northwest, and then 150 km at 30° west of south. After an additional displacement, the plane is back where it started. Find the magnitude and the direction of the last leg of the journey.
asked by Spike 
Physics
Two particles are fixed along a straight line, separated by a distance 6.0 cm. The left one has a charge +2.0 nC and the right one has a charge of +6.0 nC. You must try to locate a point where the electric field is zero. (a) What is the location of the
asked by John 
science
When can the constellation puppis be seen in the night sky?:) i really need the answer to this ?:) thanks
asked by korrine 
lpu collage
An urn contains 7 red and 3 white marbles. Three marbles are drawn from the urn one after another. Find the probability that first two are red and third is white if, a) Marbles drawn are replaced after every draw. b) Marbles drawn are not replaced after
asked by sunil 
College Algebra
How would figure out the slope and intercepts: 1.4x= 14y
asked by Anonymous 
Physics
How far above the surface of the earth would you have to be before your weight is reduced by 12.89%? Please Help !
asked by Mike 
Physics
(a) Find the speed of a satellite moving around the earth in a circular orbit that has a radius equal to five times the earth's radius of 6.38 106 m. (b) Find the satellite's orbital period. Please Help!
asked by Mike 
Physics
A body of mass m is attracted toward a 10.7 kg mass, 29.7 cm away, with a force of magnitude 6.54 108 N. Find m. Please Help!
asked by Mike 
Physics
How close would the masses 0.545 kg and 0.109 kg have to be in order for the gravitational force between them to have a magnitude of 1.03 N? Please Help!
asked by Mike 
Religion
Debate topic: "Virtue is only beneficial to the one being virtuous." Me and my group members are on the Affirmative side, therefore must agree that this resolution is true and must stand. I've done some brainstorming with my group and researched online
asked by Myu 
Physics.
A rollercoaster car speeds down a hill past point A where R1 = 8.6 m and then rolls up a hill past point B where R2 = 16.0 m. (a) The car has a speed of 18.4 m/s at point A. if the track exerts a normal force on the car of 2.21 104 N at this point, what
asked by A rollercoaster car 
math
the length of a rectangle is 100 inches more than the width. if the perimeter of the rectangle is 1320 inches, find the dimensions
asked by lori 
2 Stats Questions
Which of the following statements is not true about samples that can be treated as matched pairs data? I. Data collected on these samples is analyzed by calculating the differences between paired observations and using that data in one sample tests. II.
asked by Meep. 
Physics
A car rounds a 1.35km radius circular track at 93 km/h. Find the magnitude of the car's average acceleration after it has completed onefourth of the circle.
asked by Hillary 
chemistry
calculate the wavelength (in nm) of the red light emitted by a neon sign with a frequency of 4.74 x 10^14 Hz. i have no idea how to even set this up. please someone help.
asked by savannah 
College Chemistry
a mixture contains two crystalline solid X and Y. Decide if pure X can be obtained by a proper recrystallization using solvent A. Include the exact volumes of solvent used and the amount of pure X obtained. GIVEN: Solubility of X in boiling A :200mg/ml
asked by Anonymous