KS

Most popular questions and responses by KS
1. Physics

A girl is sledding down a slope that is inclined at 30º with respect to the horizontal. The wind is aiding the motion by providing a steady force of 131 N that is parallel to the motion of the sled. The combined mass of the girl and the sled is 59.9 kg,

2. Social Studies

I need help under standing this passage"...[The] said Cooper Hughs Freedman with his wife...are to work on said farm and to cultivate forty acres in corn and twenty acres in cotton, to assist in putting that fences on said farm in good order and to keep

3. Language Arts

In "January," what does the speaker mean by the image in the following lines? The sun a spark Hung thin between The dark and dark. Persona of the poem is"John Updike"

4. PHYSICS

How do I solve this? Object A is moving due east, while object B is moving due north. They collide and stick together in a completely inelastic collision. Momentum is conserved. Object A has a mass of mA = 16.6 kg and an initial velocity of nu Overscript

5. PHYSICS

How do I solve this? A mine car (mass=380 kg) rolls at a speed of 0.50 m/s on a horizontal track, as the drawing shows. A 170-kg chunk of coal has a speed of 0.92 m/s when it leaves the chute (at a 25 degree incline). Determine the speed of the car–coal

6. PHYSICS

In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 1.43 m/s. However, this speed is inadequate to compensate for the kinetic friction between the puck and the ice. As a result, the puck travels only one-half the

7. PHYSICS

The drawing shows two frictionless inclines that begin at ground level (h = 0 m) and slope upward at the same angle θ. One track is longer than the other, however. Identical blocks are projected up each track with the same initial speed v0. On the longer

8. algebra

Marcus plotted the points (0,0),(6,2),(18,6), and (21,7) on a graph. He wrote an equation for the relationship. Find another ordered pair that could be a solution of Marcus's equation.

9. PHYSICS

A thermos contains 152 cm3 of coffee at 93.8 °C. To cool the coffee, you drop two 11.6-g ice cubes into the thermos. The ice cubes are initially at 0 °C and melt completely. What is the final temperature of the coffee in degrees Celsius? Treat the coffee

10. Solid State Chemistry

Which molecule ( KI or LiF ) has the higher boiling point? Select the single most important reason below to justify your choice should have the higher melting point Both molecules are nonpolar but the higher melting includes hydrogen bonding Both molecules

11. PHYSICS

Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C. I am stuck on trying to figure out how to solve this. Please help!

A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The

13. stats

How large a sample should be taken if the population mean is to be estimated with 99% confidence to within \$72? The population has a standard deviation of \$800 Please Help, im stuck

14. Chemistry

A hot air balloon is filled with hot air and the hot air forces the volume of the balloon to expand until the density of the gas in the balloon is less than the density of the outside air. The volume must be 20% larger than the balloon would be at STP in

15. Physics

An eagle is flying horizontally at 5.8 m/s with a fish in its claws. It accidentally drops the fish. (a) How much time passes before the fish's speed doubles? (b) How much additional time would be required for the speed to double again?

16. Math

Isaac is packing boxes into a carton that is 12 inches long 18 inches wide and 6 inches high. The boxes are 4 inches long 6 inches wide and 2 inches high. How many boxes will fit inside the carton?

17. PHYSICS(HELP)

A yoyo of mass m=1 kg and moment of inertia ICM=0.045 kg m2 consists of two solid disks of radius R=0.3 m, connected by a central spindle of radius r=0.225 m and negligible mass. A light string is coiled around the central spindle. The yoyo is placed

18. PHYSICS

How do I solve this? A 700-kg race car can drive around an unbanked turn at a maximum speed of 41 m/s without slipping. The turn has a radius of 190 m. Air flowing over the car's wing exerts a downward-pointing force (called the downforce) of 12000 N on

19. PHYSICS

A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The

20. PHYSICS

The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the cylinder is a vacuum. The cross-sectional area of the piston is A = 2.50 × 10-3 m2. The initial pressure, volume, and temperature

When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume

22. Physics

A girl is sledding down a slope that is inclined at 30º with respect to the horizontal. The wind is aiding the motion by providing a steady force of 131 N that is parallel to the motion of the sled. The combined mass of the girl and the sled is 59.9 kg,

A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The

24. PHYSICS

A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The

25. PHYSICS

A 50.5-g golf ball is driven from the tee with an initial speed of 57.4 m/s and rises to a height of 23.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 7.97 m below its

26. physics

2 masses m1 and m2 are connected at ends of in-extensible string that passes over pulley find acceleration and tension in pulley.

27. PHYSICS

A Goodyear blimp typically contains 5040 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. The temperature of the helium is 282 K. What is the mass (in kg) of the helium in the blimp?

28. PHYSICS

How do I solve this? The blade of a windshield wiper moves through an angle of 90.0° in 0.453 s. The tip of the blade moves on the arc of a circle that has a radius of 0.775 m. What is the magnitude of the centripetal acceleration of the tip of the blade?

29. Chemistry

The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of

30. PHYSICS

An ice chest at a beach party contains 12 cans of soda at 2.69 °C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 6.05-kg watermelon at 24.1 °C to the chest. The specific heat capacity of watermelon

31. PHYSICS

How do I solve this? For the normal force in the drawing to have the same magnitude at all points on the vertical track, the stunt driver must adjust the speed to be different at different points. Suppose, for example, that the track has a radius of 2.87 m

32. Physics

Consider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 8 % of its mass in 300 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 150.0 s?

33. math

Given the information: the sampled population is normally distributed, = 10.4, n = 60, and = 81.2. a. Find the 98% confidence interval for b. Interpret the confidence interval in Where do i begin

34. MultiMedia

What is the process of making a web portfolio?

35. Social studies

I want to answer that question but i can't understand it. I'm also not really expecting anyone to reply back butt pleas if you do can you make it very detailed so i can understand it.

36. Finite

One coin is fair and one is weighted so that Pr[H] = [ 1/4]. You randomly select one of the two coins, and flip it 3 times, noting the result of each flip. What is the expected number of heads?

37. PHYSICS

Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C.

38. PHYSICS

Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C.

39. Physics

The drawing shows a circus clown who weighs 750 N. The coefficient of static friction between the clown’s feet and the ground is 0.630. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the

1. Language Arts

Actually it don't listen to me A is right because the trees don't have any leaves cause it's winter so they are looking at the bare branches and that makes them seem like lace and the branches are dark so A is correct.

posted on April 11, 2017
2. Language Arts

is it a or is it c because it says trees black lace so it must be getting dark

posted on April 11, 2017
3. Social Studies

sharecropping

posted on April 7, 2017
4. Physics

Okay, I solved for a and came out with a=4.28m/s^2 (thank you!). However, when I plugged it into the formula to solve for time, my answer is still incorrect. Am I using the wrong formula?

posted on April 8, 2015
5. physics (Urgent)!!!!!!!!!!!!!!!!!!!!!!

for part c the correct answer is the first option

posted on January 13, 2014
6. Classical mechanics

lies!

posted on January 13, 2014
7. PHYSICS(help)

q6)a)x_1=sqrt(2*g*R*m/(m*g*alpha+k)) b) t=pi/(2*sqrt((k+alpha*m*g)/m))) c) The block will move back and get catapulted up the circular track

posted on January 13, 2014
8. physics

vm = 2.213594362 Q = 0.278168471

posted on December 30, 2013
9. Physics Classical Mechanics

23220

posted on December 30, 2013
10. chemistry

its alright your intentions were good i can see that so your apology is accepted. sorry for being harsh when all you did was trying to help. i met up with someone who got 94 in the finals and he was kind enouigh to give me some answers 26)1, 3, 0.57; 27

posted on December 23, 2013
11. chemistry

for Nb correct answer is 6.89 Volts. Thanks alot ZM for posting the wrong answer. Next time please double check before sharing your results. I tried the steps anonymous posted for K surface energy from bananas but its giving me the wrong result. Anyone

posted on December 23, 2013
12. chemistry

Hey !@#\$%^& we are discussing our results here, do tag along. /display.cgi?id=1387456620

posted on December 22, 2013
13. chemistry

Alright i got it 24)0.558 0.000327

posted on December 22, 2013
14. chemistry

Yeah hi. Hil told us that can someone solve the lead solubility and tell us the end result please? Here are the steps: "This is simple Stoichiometry problem Write down PbI2 -> Pb2+ + 2I- Therefore Ksp = [Pb2+][I-]^2 From the stoich you can derive that Ksp

posted on December 22, 2013
15. chemistry

try the stereoisomers one q27, looks pretty straightforward.

posted on December 21, 2013
16. chemistry

I am also telling the answers of those i myself got wrong in my previous tries. 10 a is 2.42e-6 I got it wrong

posted on December 21, 2013
17. chemistry

Thanks man, i am telling you all i know.. don't worry, if you get more than 60 overall you will receive your certificate (like i did in bio despite failing in the final, they don't mention your score in the certificate) I don't know anything about gold or

posted on December 21, 2013
18. chemistry

B and both glasses will be weaker

posted on December 21, 2013
19. Solid State Chemistry

"Both molecules are ionic but the higher melting point has a larger cohesive energy"

posted on December 21, 2013
20. chemistry

Dude its wrong again

posted on December 21, 2013
21. chemistry

0.000258

posted on December 21, 2013
22. chemistry

1.8e-6

posted on December 21, 2013
23. chemistry

tetrahedral,2,1,1,no,no

posted on December 21, 2013
24. chemistry

BN,AlAs, C,GaAs,GaP

posted on December 21, 2013
25. chemistry

yes 3.88e-7

posted on December 21, 2013
26. chemistry

1.04e-3 p type

posted on December 21, 2013
27. chemistry

whoops i am so sorry its B

posted on December 21, 2013
28. chemistry

i think the former CaCl2 is A, not sure about Nacl

posted on December 21, 2013
29. chemistry

posted on December 21, 2013
30. chemistry

thanks for 28 it's correct, as for 12, a is yes and b is 3.88e-7 I got them correct. Thanks again. feel free to brainstorm for other questions.

posted on December 20, 2013
31. classical mechanics

v^2/(2*g)

posted on December 20, 2013
32. chemistry

You are welcome, thanks. I forgot to convert from KJ/mol to J/mol! If you get anything else, pls do share on this page!

posted on December 20, 2013
33. chemistry

Right... I was thinking the same along the lines of light is "quantized". Thanks!

posted on December 20, 2013
34. chemistry

Okay i am going to list down all the answers i got so far, please assist me in those which i left, if you have any: 1)156.675158119 2)5 3)90.1775147929 4)3s,3p,4s,3d,5s,5p,4f 10,2,14,6 5)-777 2.86e-10 6)8.88 dont know what part b is 7)O2, O2-2

posted on December 20, 2013
35. Chemistry

Sn

posted on December 20, 2013
36. chemistry

thanks bob it worked!

posted on December 19, 2013
37. chemistry

even after converting to joules we get the same answer 4.835 which is wrong.

posted on December 19, 2013
38. Physics Classical Mechanics

@jessica b) Find Mu_s first Mu_s= (m_p/3 + m_l/2) *cotan (theta)/(m_p+m_l) a) Force = Mu_s*g(m_p+m_l)

posted on December 12, 2013
39. Classical Mechanics Physics - Urgent help please

can i have the formula atleast? I just need one more percent to earn the certificate , thank you

posted on December 9, 2013
40. Classical Mechanics Physics - Urgent help please

greco can you please solve for my rocket question Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 9 % of its mass in 310 s (assume the burn rate is constant). (a) What is the speed

posted on December 9, 2013
41. Classical Mechanics - Need Help Please

thanks bw your formula worked for both q1 and merry, thanks so much for sharing with us :)

posted on December 9, 2013
42. Physics Classical Mechanics

g*(m_1-mu_k*m_2)/(m_1+ m_2+(I_c/R^2)) g*(m_1-mu_k*m_2)/(m_1+ m_2+(I_c/R^2))*t_1^2/2

posted on November 22, 2013
43. Chemistry

Never mind guys, alphawolfram did it for me :)~ any luck with the last three questions? Today is the deadline!

posted on November 17, 2013
44. Chemistry

The Young's modulus for a material is 17.0 x 1010 N/m2. The material is stretched to a strain of 2.0 x 10-3. How much elastic energy will be expended? (Express your answer in J/m3) answer is 340000

posted on November 17, 2013
45. Chemistry

oops I reset it, new value of T is 1091 K somebody help please :'(

posted on November 16, 2013
46. Chemistry

Thanks Anon and Drew for the formula, I have other exams to prepare for so this was a life saver, I appreciate it truly. I however do not know how to calculate my result using exponents so can someone please solve for T=1373 K? I would be forever grateful.

posted on November 16, 2013
47. Physics Classical Mechanics

R=2 m, Ic=9000 kg•m², r₀=1.2 m, m=20 kg, F=200 N, Δt=18 s. I=Ic+2I₀=Ic+2m r₀² = =9000+2•20•1.2²=9057.6 kg•m². M=Iα α=M/I=FR/I =200•2/9057.6 = 0.044 rad/s² ω=α•Δt =0.044•18=0.792=0.8 rad/s P=Fv=P ωR = 200•0.8•2 = 320 W.

posted on November 11, 2013
48. PHYSICS

q7, the answer is a)2*pi*sqrt(((1/3*m+m)*l^2+1/2*m*R^2)/((1/2*m+m)*g*l)) b)2*pi*sqrt(((1/3*m+m)*l^2)/((1/2*m+m)*g*l)) 4a: (m_2*g)/(m_2+I_c/R^2) b: (I_c*m_2*g)/(m_2*R^2+I_c) c: sqrt((2*h*m_2*g*R^2)/(m_2*R^2+I_c))

posted on November 11, 2013
49. Physics

whoops, bw got here before me. I was wrong there. cheers sasha, hope we can help each other again in times of need.

posted on November 4, 2013
50. Physics

k can either be 40 or 80.Thanks mouse and to all that helped. We worked as a team and we nailed it :D

posted on November 4, 2013
51. Physics

@phy: input your derivated function (it should have an x^3 - x in it. In alphawolfram, write series (then your function, then) point (then x_0 value) and the result will be of the form f=f_0 -k(x-x_0), check your value for f_0 and k in that equation (most

posted on November 3, 2013
52. Physics

mouse how did you get q8.b) x2-x1? i know that for part d the answer is The block will stay at its resting position x2. for q6 d1) h~ is always smaller than h and for d2) t~up

posted on November 3, 2013
53. physics(help)

for second part it is m*g*tan theta

posted on November 3, 2013
54. Physics

Thanks alot mouse! after reading your hints I managed to learn how to use series in wolfram :) There should have been more directions provided with the question, the textbook description was insufficient! I havent got the spring one either but for the

posted on November 3, 2013
55. Physics

a = (v - v0)/t = (1 m/s - 5 m/s)/(1 s) = -4 m/s^2 F = ma N - mg = ma N = m(a+g) N = (w/g)(a+g) N = w(a/g + 1) N = (500 N)(-4 m/s^2 / 10 m/s^2 + 1) = 300 N

posted on November 2, 2013
56. PHYSICS(HELP)

try PE=0 as its at infinity

posted on November 2, 2013
57. PHYSICS (HELP!!!)

try x_0 = 3.75. i used alphawolfram to plot the graph

posted on November 2, 2013
58. Physics

240 for ur values

posted on November 2, 2013
59. world history

I NEED THE SAME ANSWER. For my world history class.

posted on April 5, 2011
60. Accounting

I believe that if a person does not have the answer to the question, he or she should not reply. That is a waste of others time and it is also childish.

posted on June 21, 2009