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Most popular questions and responses by question
1. ## chemistry

Some liquids have enough attractions between molecules to form dimers. (Dimers are molecules formed from the combination of identical molecules, A + A --> A2.) What effect would this have on the experimental molar mass? This was a molar mass lab. Alcohol

2. ## math

Find the volume of a square pyramid with a base length of 9 cm and a height of 4 cm. 324 cm3 108 cm3 36 cm3 152 cm3 i think it could be d or b im kinda leaning towards d though

3. ## Physics

A 4.0 kg block is stacked on top of a 12.0 kg block, whcih is accelerating along a horizontal table at a = 5.2 s^-2 m. Let Mu k = Mu s = Mu. (a) What mininum coefficent of friction Mu between the two blocks will prevent the 4.0 kg block from sliding off?

4. ## math

Find the volume of a rectangular prism with the following dimensions: Length = 5 mm Base = 7 mm Height = 3 mm 142 mm2 105 mm2 126 mm2 130 mm2

5. ## math

please help me check!! James rents a car for x days. the rate is 19.95 per day, which includes 20 miles of driving and .40 per mile for each additional mile. If James drives 30 miles per day for the duration of this period, which of the following

6. ## Physics

this one is kind of hard A bicyclist can coast down a 7.0 degree hill at a steady 9.5 h^-1 km. If the drag force is proportional to the square fo the speed v, so that Fd = cv^2, calculate (a) the value fo the constant c and (b) the average force that must

7. ## Physics

ok part (b) A 4.0 kg block is stacked on top of a 12.0 kg block, whcih is accelerating along a horizontal table at a = 5.2 s^-2 m. Let Mu k = Mu s = Mu. (a) What mininum coefficent of friction Mu between the two blocks will prevent the 4.0 kg block from

8. ## Math

James has a square piece of paper. He wants to cut it into strips of equal width. He says, This piece of paper is about 48 cm wide. How can he find the width of each strip without measuring? Is this width accurate?

9. ## Math

Marcy paid \$35 for 10 kg of raisins. She divided raisins equally into two containers. Then she sold raisins in the first container at \$4.50 per kg and those in second container at \$5.50 per kg. How much money did Marcy earn after selling all the raisins?

10. ## Probability and Statistics

In a toy manufacturing company three machines A,B and C are employed to manufactures toys. Machines A, B and C manufacture 20%, 30% and 50% of the total toys respectively. A quality control officer examined the machines and found that A,B and C produce 2%,

11. ## physics

A piston of cross sectional area 100cm2 is used in hydraulic to exert a force of 10000000dyne find the cross area of another having weight 2000kg

12. ## Chemistry

What is the molarity of a phosphoric acid solution if 32.3 mL of the phosphoric acid solution is titrated to the final equivalence point with 20.6 mL of 0.581 M sodium hydroxide acid solution? H3PO4 + 3NaOH ==> Na3PO4 + 3H2O mols NaOH = 0.0206L*0.581 M= ??

13. ## Chemistry

During reaction mechanism... A. catalyst does not change the reaction mechanism. B. catalyst changes the reaction mechanism. C. catalyst always makes a reaction mechanim more complicated. Catalysts lower the activation energy and provide alternative

14. ## physics

a cube of side 6cm is placed in graduated measuring cylinder 20 ml of watercis then added and the cubes remains at the bottom of the cylinder what will be calculated amount

15. ## math

Find the volume of a rectangular prism with the following dimensions: Length = 5 mm Base = 7 mm Height = 3 mm 142 mm2 105 mm2 126 mm2 130 mm2

16. ## physics

The flywheel of a steam engine runs with a constant angular speed of 164 rev/min. When steam is shut off, the friction of the bearings and the air brings the wheel to rest in 1.6 h. I figured out the constant angular acceleration=1.71 rev/min2 but im not

17. ## Physics

ok I'll be using a home work problem to ask the question. I'm not asking for help on the question I got the correct answer just need to understand this concept better. Calculate the acceelration due to gravity on the Moon. The moon's radius is about 1.74 E

18. ## Chemistry

During activation energy... A. A catalyst lowers the activation energy by changing the reaction mechanism. B. A catalyst does not change the activation energy. C. A catalyst lowers the activation energy by changing the rate. D. A catalyst raises the

19. ## Biology

why does proline stain yellow in ninhydrin?

20. ## biology

Why are the subclavian vein and subclavian artery positioned where they are relative to each other?

21. ## math

Posted by question on Wednesday, July 22, 2009 at 4:56pm. solve 5/8x + 1/16x=7/16+= the solution is x=___ Responses math - Mr. L, Wednesday, July 22, 2009 at 7:23pm 5/8x is the same as 10/16x That should help my final answer would be 7/27 do i have it

22. ## off-topic question for tutors

how do you manage to donate your time to tutor everyone on this site for so many years? thank you so much

23. ## physics

Advantageous of 3pin plug over 2 pin plug

24. ## History

Presidential communications are: • Presumptively privileged from compelled disclosure. • Completely confidential. • Absolutely privileged from compelled disclosure. • Not privileged from compelled disclosure whatsoever

25. ## Chemistry

Question 2: Use your balanced equation to calculate the volume of 0.12 M Na3PO4 to stoichiometrically react with the 3.0 mL of Co (NO3)2. Show your work. 3) Discuss how your supernatant color in the 6 different test tubes supports your calculated result in

26. ## Physics

ok Boxes are moved on a converyor blet from where they are filled to the packing station 10m away. The belt is initially stationary and must finish with zero speed. The most rapid transit is accomplished if the belt accerlates for half the distance, then

27. ## Physics

ok were doing a lab h t t p: / /i m g2 0 0. i m a ge s h a c k. u s / im g 2 0 0 / 30 3 8 /s k e t c h 2 p q g. j p g the timer in the picture makes a mark on the tape at a set interval... my question is well what is actually is happening is that I'm

28. ## math

solve 5/8x + 1/16x=7/16+= the solution is x=___

30. ## career

People, who want to become a president or politician, take what courses in highschool and University, like Harvard has Law + Business or Law + Govt. so which is a president or politician most likely to take?

31. ## english

My teacher is giving our classroom books and our assignment is to the find the time period of the book. My book is Death of the Sales man and it was created on 1949, so the time period would be that it was created during World War 2, Berlin Airlift?

32. ## confidentiality of health information

Joe researcher asks for access to patient records as part of a research project. What should the health information manager do? A. Say yes-access for research is permitted. B. Say no. C. Tell Joe to submit his request to an institutional review board if he

33. ## Physics

when resolving gravity into components Fg (x component) = Fg sin theta when you get the units you get Newton times a degree how come we just ignore the degree for example if it was 9 N you wouldnt say 9 N (degrees) why not? How do the degrees just

34. ## Physics

I'm trying to prove Kepler's equations the proof is in my book but I don't understand it (T1/T2)^2 = (s1/s2)^3 ok first what allows us to rewrite that formula as so??? (s1^3/T1^2)=(s2^3/T2^2) my book goes about the proof as m1 ((4 pi^2 r1)/T1^2) which I

35. ## Chemistry

During rate of reverse step... A. A catalyst decreases the reverse rate of reaction. B. A catalyst does not change the reverse rate of reaction. C. A catalyst increases the reverse rate of reaction. A catalyst hastens the time for equilibrium to be

36. ## Math

the volume of fort peck dam is 96,000 X 1,000 m3. Suppose the state of Montana decides to increase the volume of the dam. After the improvements, fort peck will hold 10 times as many cubic meters will fort peck hold after the improvemts?

37. ## Physics

I just need to know how to start this equation because it makes no sense The position of a particle is given by r = (6.0 cos 3.0 t i + 6.0 sin 3.0 t j) meters. Determine (a) the velocity vector, v, and (b) the acceleartion vector, a. (c) What is the parth

38. ## Physics (Algebra Bit)

I still need help on my other question as well... A runner hopes to complete the 10,000 m run in less than 30.0 min. AFter running at constant speed exactly 27.0 min there are still 1100 m to go. The runner must then accelerate at .20 s^-2 m for how many

39. ## physics

ok Boxes are moved on a converyor blet from where they are filled to the packing station 10m away. The belt is initially stationary and must finish with zero speed. The most rapid transit is accomplished if the belt accerlates for half the distance, then

40. ## Math

The graph in the xy plane of the quadratic function f contains the points (0,0),(1,5),(5,5) What is the maximum value of f(x)?

41. ## Math

Help me , what is y if y=2x+10

42. ## math

f i have a 100 in a class and i get a 0 on something that is worth 23% what will my grade be ?

43. ## math

a playground has sides 17 m, 19 m and 18m. is 60 m of fencing enough to fence the 3 sides?

44. ## sarah

is fate choice or chance? explain both sides

45. ## Math

Whats the midpoint for 2500-7000? Whats the steps?

46. ## Phyics

In an historical movie, two knights on horseback start from rest 94.3 m apart and ride directly toward each other to do battle. Sir George's acceleration has a magnitude of 0.273 m/s2, while Sir Alfred's has a magnitude of 0.280 m/s2. Relative to Sir

47. ## phyics

In an historical movie, two knights on horseback start from rest 94.3 m apart and ride directly toward each other to do battle. Sir George's acceleration has a magnitude of 0.273 m/s2, while Sir Alfred's has a magnitude of 0.280 m/s2. Relative to Sir

48. ## Chemistry

What are the raw materials for polyethene and polystyrene?

49. ## math

the width of a rectangle is fixed at 27 cm. what lengths will make the perimeter greater than 70cm? the length must be greater than _70_ cm please check if this is correct. thank you!!

50. ## fin 200

considering investing in a company. Which financial ratios would you find most useful? Why?

51. ## question

what is garbologist. What they do. A garbologist is a scientist who studies garbage to learn about societies and cultures. Check this site for more information. http://environmentalchemistry.com/yogi/environmental/wastehistory.html

52. ## Biology

What structures make up the fibers of the mitotic spindle? Since this is not my area of expertise, I searched Google under the key words "mitotic spindle fiber structure" to get these possible sources: http://www.springerlink.com/content/n1545188147w90l7/

53. ## Social Studies

Discuss the validity of the following quotation: "The British imperial economic system, including mercantilism, exploited the American colonists and offered them few benefits. As such it represented a valid reason for revolution."

54. ## Biology

How many types of amino acids are there in milk? I believe there are either 8 or 9, all of which are essential to humans because humans cannot create these proteins.

1. ## math

is any of this right?

posted on April 18, 2019
2. ## English

So what the real answers are?

posted on March 28, 2018
3. ## english

thanks for the help

posted on December 31, 2017
4. ## english

oh OK. i didn't see them thank you for the help. so it would be 1946-1949 ?

posted on December 31, 2017
5. ## english

It was written in 1948, and the main characters were in the Great Depression.

posted on December 31, 2017
6. ## english

I honestly don't understand.

posted on December 31, 2017
7. ## Math

24/41

posted on December 4, 2017
8. ## math

Why is 5.626 divided by 7.5

posted on November 7, 2017
9. ## Social Studies

Raven is this for CCA the online school??

posted on April 15, 2016
10. ## Probability and Statistics

0.1

posted on October 29, 2015
11. ## Chemistry

Those are the instructions but I just need help with this question. I balanced the reaction between cobalt ii nitrate with sodium phosphate. And I wanted to know why they supernatant liquid color was important when I mixed these two solutions together. I

posted on March 1, 2015
12. ## sarah

it can prob be by choice but wut exactly does it mean by chance ?

posted on December 14, 2014
13. ## Physics

how did you get the 9.81?

posted on February 12, 2014
14. ## math

miss sue?

posted on March 6, 2013
15. ## math

posted on March 6, 2013
16. ## math

I think its 105

posted on March 6, 2013
17. ## math

5--4 x B can have no carryover to 4 x 2 so B must be 1 as A is already 2. why can't B be 0 at step 5? At this point, B can be 0,1,2, and you can eliminate 2 per your reason, but you can't eliminate 0 yet--which makes the rest of your steps invalid.

posted on May 3, 2012
18. ## HCA 270 Approaches to Valuation

To the people that are bashing students looking for help: Why are you on here if you were not looking for help yourself?? A person can have mutiple degrees and if you really do this site showing the kind of statements you make shows how extremely ignorant

posted on May 22, 2011
19. ## Calculus

ya i realized that but I still have no idea how you get 2 - [(x-2)^2sgn(2-x)]/2 by hand...

posted on March 19, 2011
20. ## math

Would the fact 1 (american) gallon = 3.785L and 1 (canadian) gallon = 4.55L come into affect for # 5?

posted on October 28, 2009
21. ## Physics Fluids

Fg on object = (it's density)(it's volume)g Fb = (density of water)(volume of water underneath object pushing it up)gravity your suppose to divide the two gravity is suppose to cancel out and the volume but the volumes are two different objects why are

posted on October 23, 2009
22. ## Physics Fluids

why are the volumes the same

posted on October 23, 2009
23. ## physics

ok so I got down to this x = sqrt( ((m1 + m2)(3.84 E 8))/m2 ) which gave me the wrong answer

posted on September 13, 2009
24. ## physics

m3 = mass of satalite (G m3 m2)/x^2 = (G m3 m1)/(3.84 E 8 m - x)^2 I can cancel out the m3 and the G right?

posted on September 13, 2009
25. ## TO BOBPURSLEY

ok i get it see new question

posted on September 12, 2009
26. ## TO BOBPURSLEY

Fg exerted by whatever it's orbiting onto moon = r^-2 G (mass of moon) M = to the gravitional force exerted by moon onto M = Mg ok then you can divide by M but why is it the force of gravity exerted by the moon onto whatever it's orbiting mass M just equal

posted on September 12, 2009
27. ## TO BOBPURSLEY

ok net force = m a only force present force of gravity Fg = mg = r^-2 G m M were m is the mass of the moon and the M is the mass of what ever it's orbiting... correct? Fg = mg = r^-2 G m M divide both sides by the mass of the moon g = r^-2 G M so I guess I

posted on September 12, 2009
28. ## physics

Us = (rg)^-1 V^2 Us = (.12 m (9.80 kg^-1 N))^-1 (22.35 s^-1 m)^2 Us = 420 back of book says .34

posted on September 5, 2009
29. ## physics

50 mph is in the question in the book

posted on September 5, 2009
30. ## very easy algebra one

which expression is correct from this 180 s(a t3) THIS ONE??? (180 s)a + (180 s)t3 or this ONE??? 180 s * a * t3

posted on August 21, 2009
31. ## Physics (Algebra Bit)

Is the answer to (c) correct by the way for the other problem I didn't know how fast it would be accelerating realtive to the larger block because the larger block would be accelerating more at 5.2 s^-1 m and the smaller block accelerates at 3.2 s^-1 m so

posted on August 20, 2009
32. ## Physics (Algebra Bit)

thanks for help on other question =]

posted on August 20, 2009
33. ## Physics

ok for the applied force for (a) on the bottom block I got 83 N not sure if it's right... for the applied force in (b) wouldn't it be the same... I'm confused... Can you check my answer for (c)

posted on August 20, 2009
34. ## Physics

can you check my answer for (c)

posted on August 20, 2009
35. ## Physics

Sense this problem 32 the answer isn't in the back =[

posted on August 20, 2009
36. ## Physics

also is the talbe frictionless or not I couldn't understand by the way it was worded

posted on August 20, 2009
37. ## Physics

hmmmmmm interesting THANKS YOU

posted on August 20, 2009
38. ## Physics

wouldn't it have a zero acceleration sense it's suppose to not be moving

posted on August 20, 2009
39. ## Physics

Were did 4.5 s^-2 m come from???

posted on August 20, 2009
40. ## Physics

Isn't net force x direction = -Ffr sense it's in the left direction then I would get a negative Mu???

posted on August 20, 2009
41. ## Physics

i don't see how to apply Newtons second law to the top block there's a force pointing left the force of static friction is there a force opposing this force pointin in the right direction? How do I find the mininum coefficent of friction

posted on August 20, 2009
42. ## Physics

ok for drag force c = v^-2 Fgx = (2.639 s^-1 m)^-2 95.5 N Fgx = mg sin theta

posted on August 20, 2009
43. ## Physics

ok for b i got 565 N which was correct with book answer in back

posted on August 20, 2009
44. ## Physics

ok I know this is right I redid it (a) 13.7 m^-1 kg

posted on August 20, 2009
45. ## Physics

for (b) i got -.4172 N ;[

posted on August 20, 2009