Thursday

April 17, 2014

April 17, 2014

Number of results: 75

**physicsss**

while driving his sports car at 20.0 m/s down a four-lane highway, eddie comes up behind a slow-moving dump truck and decides to pass it in the left lane. If eddie can accelerate at 5.00 m/s2) (squared) how long will it take for him to reach a speed of 30.0 m/s? i know its ...
*Tuesday, September 11, 2007 at 8:15pm by confusedd!HELPP!!!*

**physicsss**

It is now 10:29a.m, but when the bell rings at 10:30a.m. Suzete will be late for french class for the third time this week. She must get from one side of the school to the other by hurring down three different hallways. She runs down the first hallway, a distance of 35.0m at a...
*Tuesday, September 11, 2007 at 8:27pm by confusedd!HELPP!!!*

**physicsss**

distance = rate*time time for first hallway is time = distance/rate = 35.0/3.50 = ?? Do time for second hallway and third hallway the same, add the times together, and see if the total adds to more than 1 minute (the difference between 10:29 and 10:30).
*Tuesday, September 11, 2007 at 8:27pm by DrBob222*

**physicsss**

5.00 m/s^2 is the acceleration rate of the passing car. Multiply it by the time interval for the velocity change/ You havew already written the correct equation. Solve if for t. t = (10 m/s)/(5 m/s^2) Your answer will be in seconds
*Tuesday, September 11, 2007 at 8:15pm by drwls*

**physicsss**

5.00 m/s^2 is the acceleration rate of the passing car. Multiply it by the time interval for the velocity change/ You havew already written the correct equation. Solve if for t. t = (10 m/s)/(5 m/s^2) Your answer will be in seconds
*Tuesday, September 11, 2007 at 8:15pm by drwls*

**PHYSICSSS**

Small rockets are used to make tiny adjustments in the speeds of satellites. One such rocket has a thrust of 35 N. If it is fired to change the velocity of a 71500 kg spacecraft by 64 cm/s, how long should it be fired?
*Monday, December 3, 2007 at 8:46pm by oliphia*

**PHYSICSSS**

Thrust x time, also known as "impulse", must equal the momentum change desired. In your case the momentum change required is 7.15*10^4 kg * 0.64 m/s = 4.58*10^4 kg m/s Set this equal to 35 Newtons * T and solve for T. It will be in seconds
*Monday, December 3, 2007 at 8:46pm by drwls*

**physicsss**

given (young's double slit experiment the slit separation is 0.08mm and the slits distance to the screen is 1.6 m. the central maxima has intensity Imax and the light has a wavelength of 6nm. the separation of the fringes was found to be 12mm near the center of the screen. ...
*Thursday, November 13, 2008 at 8:04pm by Kimora*

**physicsss**

A cable attached to a block of mass 11 kg pulls the block along a horizontal floor at a constant velocity. If the tension in the cable is 5.3 N, what is the coefficient of kinetic friction between the block and the floor?
*Saturday, February 14, 2009 at 12:42am by kj*

**physicsss**

Phobos is the larger and closer of Marsâ€™s two moons. It has no atmosphere, a mean radius of 11 km, an albedo of 0.07, and an emissivity of 1.0. (i) Assuming that the radiative temperature of Phobos is 222 K and that it is spherical, what is its mean distance from the sun? (ii...
*Sunday, January 24, 2010 at 4:50pm by physics help!*

**physicsss**

sorry but i dont understand wat is R^2 wat does that represent? and wat is Hsun?
*Sunday, January 24, 2010 at 4:50pm by physics help!*

**PHYSICSSS!**

A brass lid screws tightly onto a glass jar at 20 oC. To help open the jar, it can be placed into a bath of hot water. After this treatment, the temperature of the lid and the jar are both 60 oC. The inside diameter of the lid is 8.0 cm at 20 oC. Find the size of the gap (...
*Tuesday, September 21, 2010 at 8:39am by JT*

**PHYSICSSS!**

I am not going to do it for you. I will be happy to critique your work. I am getting the idea that you are answer grazing.
*Tuesday, September 21, 2010 at 8:39am by bobpursley*

**physicsss**

A Thompsonâ€™s gazelle can reach a speed of 13 m/s in 3.0 s. A lion can reach a speed of 9.5 m/s in 1.0 s. A trout can reach a speed of 2.8 m/s in 0.12 s. Which animal has the greatest acceleration?
*Thursday, October 28, 2010 at 3:56pm by Jay*

**physicsss**

A heavy freight train has a mass of 11800 metric tons. If the locomotive can pull with a force of 691000 N, how long does it take to increase it's speed from 0 to 70.3 km/h? 20.36=V0+5.9x10^-3 =349.1 s is this correct?
*Sunday, October 31, 2010 at 5:32pm by Jay- just need help!*

**physicsss**

A heavy freight train has a mass of 11800 metric tons. If the locomotive can pull with a force of 691000 N, how long does it take to increase it's speed from 0 to 70.3 km/h? 20.36=V0+5.9x10^-3 =349.1 s is this correct?
*Sunday, October 31, 2010 at 5:32pm by Jay- just need help!*

**physicsss**

No, not correct. Your work is nonsense. F=ma find a knowing a, a=(Vf-Vo)/time solve for time, but change Vf to m/s first.
*Sunday, October 31, 2010 at 5:32pm by bobpursley*

**physicsss**

see other post.
*Sunday, October 31, 2010 at 5:32pm by bobpursley*

**physicsss**

oook but would that not be the same answer? a=(20.36-0)/ t t=20.36/.059 probably not how you rearrange it but all the other ways lead to numbers that are much too small
*Sunday, October 31, 2010 at 5:32pm by Jay- just need help!*

**PHYSICSSS!**

why say such a useless comment bob? why dont you give him hint or pointers on how to start off the problem...you dont have to write out the full answers per se but dont be such an ass about it..geez
*Tuesday, September 21, 2010 at 8:39am by bobpursleysa!@#$%^&*

**physics20**

DYNAMICS: A 54kg fireman slides down a pole of a distance of 3m. if the man hits the groung at 4.4m/s than what will the force of friction acting on the man due to the pole?
*Wednesday, April 6, 2011 at 8:09pm by Ty*

**Physicsss**

A typical virus is a packet of protein and DNA (or RNA) and can be spherical in shape. The influenza A virus is a spherical virus that has a diameter of 85 nm. If the volume of saliva coughed onto you by your friend with the flu is 0.023 cm3 and 10−9 of that volume ...
*Saturday, September 10, 2011 at 6:49pm by Unknown*

**Physicsss**

numbervirus=volume coughed*E-9/(4PI(d/2)^3
*Saturday, September 10, 2011 at 6:49pm by bobpursley*

**Physicsss**

can you please explain that answer a little bit more because i really need to get this question right
*Saturday, September 10, 2011 at 6:49pm by Unknown*

**physics31**

1.A man in a hot-air balloon drops an apple at a height of 150m. If the balloon is rising at 15 m/s, find the highest point reached by the apple.
*Saturday, October 1, 2011 at 1:33am by cedric*

**physics31**

The height is 150 + 15t - 4.9t^2 The vertex of a parabola is achieved when x = -b/2a = 15/9.8 = 1.53 seconds so, at t=1.53 seconds, s = 161.48m
*Saturday, October 1, 2011 at 1:33am by Steve*

**physics10**

A sled of mass 51 kg is pulled along snow-covered, flat ground. The static friction coefficient is 0.30, and the sliding friction coefficient is 0.10. (a) What does the sled weigh? (b) What force will be needed to start the sled moving? (c) What force is needed to keep the ...
*Sunday, December 11, 2011 at 9:08pm by Hannah*

**physics12**

The instruments attached to a weather balloon have a mass of 5.1 kg. (a) The balloon is released and exerts an upward force of 102 N on the instruments. What is the acceleration of the balloon and instruments? (b) After the balloon has accelerated for 13 seconds, the ...
*Sunday, December 11, 2011 at 9:09pm by Hannah*

**physics13**

Find the mass of each of these weights in kg (a) 97 N (b) 83 N (c) 1.03 N
*Sunday, December 11, 2011 at 9:10pm by Hannah*

**physics13 - Homework Dumping**

You have a better chance of getting help if you post what you know about these answers. If you're looking for someone to cheat for you, you've come to the wrong place.
*Sunday, December 11, 2011 at 9:10pm by Ms. Sue*

**physics13**

amen
*Sunday, December 11, 2011 at 9:10pm by drwls*

**physicsss ;o**

a 12 V car battery is found to be capable of storing 2.0 kW*h of eletrical energy. for a certain eletric car, it is necessary to develop 10 kW of power to drive at 20 km/h. a)suppose that the car has 10 such batteries. how long(hours)could it run if all 10 of them released all...
*Tuesday, December 13, 2011 at 7:25pm by monee'*

**PhysicsIn what direction relative to north must ca**

Two canoeists start paddling at the same time and head toward a small island in a lake, as shown in the figure . Canoeist 1 paddles with a speed of 1.60 at an angle of 45 north of east. Canoeist 2 starts on the opposite shore of the lake, a distance of 1.5 due east of canoeist...
*Thursday, February 9, 2012 at 6:08pm by Alyssa*

**PhysicsIn what direction relative to north must ca**

An astronaut on the planet Zircon tosses a rock horizontally with a speed of 6.65 . The rock falls through a vertical distance of 1.50 and lands a horizontal distance of 8.90 from the astronaut. What is the acceleration of gravity on Zircon?
*Thursday, February 9, 2012 at 6:09pm by Alyssa*

**PHYSICSSS**

While an elevator of mass 2681 kg moves upward, the tension in the cable is 29.4 kN. (a) What is the acceleration of the elevator? (b) If at some point in the motion the velocity of the elevator is 1.04 m/s upward, what is the elevator's velocity 3.96 s later?
*Saturday, February 11, 2012 at 11:35pm by Anonymous*

**PHYSICSSS**

A train engine pulls out of a station along a straight horizontal track with five identical freight cars behind it, each of which weighs 88.0 kN. The train reaches a speed of 13.0 m/s within 6.50 min of starting out. Assuming the engine pulls with a constant force during this ...
*Saturday, February 11, 2012 at 11:36pm by Anonymous*

**PHYSICSSS**

Two boxes with different masses M1 = 1.8 kg and M2 = 2.6 kg are tied together on a frictionless ramp surface which makes an angle θ = 21° with the horizontal (see the figure below). What is the tension in the rope connecting the two boxes? N What is the tension in the ...
*Saturday, February 11, 2012 at 11:37pm by Anonymous*

**PHYSICSSS**

Two boxes with different masses M1 = 1.8 kg and M2 = 2.6 kg are tied together on a frictionless ramp surface which makes an angle θ = 21° with the horizontal (see the figure below). What is the tension in the rope connecting the two boxes? N What is the tension in the ...
*Sunday, February 12, 2012 at 12:59am by Anonymous*

**PHYSICSSS**

No figure or description was provided
*Sunday, February 12, 2012 at 12:59am by drwls*

**PHYSICSSS**

There was a ramp the two box where sliding toward to left seems like a 45 degree angle n first is m1 thn m2 does this helppp
*Sunday, February 12, 2012 at 12:59am by Anonymous*

**Physicsss helppp pleaseee**

A helicopter is lifting two crates simultaneously. One crate with a mass of 151 kg is attached to the helicopter by cable A. The second crate with a mass of 79 kg is hanging below the first crate and attached to the first crate by cable B. As the helicopter accelerates upward ...
*Sunday, February 12, 2012 at 3:26pm by Anonymous*

**PHYSICSSS please helppp ASAP**

A 9.5-kg watermelon and a 7.2-kg pumpkin are attached to each other via a cord that wraps over a pulley, as shown. Friction is negligible everywhere in this system. (a) Find the accelerations of the pumpkin and the watermelon. Specify magnitude and direction. magnitude ...
*Sunday, February 12, 2012 at 6:23pm by Anonymous*

**PHYSICSSS please helppp ASAP**

I will be happy to critique your thinking.
*Sunday, February 12, 2012 at 6:23pm by bobpursley*

**PHYSICSSS please helppp ASAP**

I am confused if I had a think I wudnt be here askin I need to put a set up n i cud solve it myself...thnk you
*Sunday, February 12, 2012 at 6:23pm by Anonymous*

**PHYSICSSS PLEASE HELP ANYONE**

A 9.5-kg watermelon and a 7.2-kg pumpkin are attached to each other via a cord that wraps over a pulley, as shown. Friction is negligible everywhere in this system. Pumpkin is at left of angle n is 53 degrees and watermelon is on right and at 30 degrees calculate acceleration ...
*Sunday, February 12, 2012 at 8:50pm by Anonymous*

**PHYSICSSS HELP PLEASE**

A crate of potatoes of mass 9.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.69 and μk = 0.41. Find the frictional force (magnitude and direction) on the crate if the crate is at rest. magnitude N direction
*Monday, February 13, 2012 at 12:02am by Anonymous*

**PHYSICSSS HELP PLEASE**

Wc = mg = 9kg * 9.8N/kg = 88.2 N. = Wt. of crate. Fc = 88.2 N. @ 30 Deg.=Force of crate. Fp = 88.2*sin30 = 44.1 N. = Force parallel to ramp. Fv = 88.2*cos30 = 76.4 N. = Force perpendicular to ramp. Fs = 0.69*76.4 = 52.7 N.,up. = Force of static friction. Fk = 0.41*76.4 = 31.3 ...
*Monday, February 13, 2012 at 12:02am by Henry*

**physics14**

In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.2 multiplied by 10-17 N during the first 2.2 cm of the tube's length; then they move at essentially constant velocity another 43 cm before hitting the screen. (a) Find the ...
*Thursday, February 16, 2012 at 8:07pm by jm*

**Physicsss**

A planet has two satellite moons. Moon X has an orbital period of 2.13 days. Moon Y has an orbital period of about 3.53 days. Both moons have nearly circular orbits. Use Kepler's third law to find the distance of each satellite from the planet's center. The planet's mass is 2....
*Friday, February 17, 2012 at 4:36pm by Angelina*

**physics14**

A uniform disk with a mass of 900 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz when Jill drops a 180-g clod of clay on a point 8.70 cm from the center of the disk, where it sticks. What is the new rotational speed of the disk?
*Thursday, March 22, 2012 at 2:37pm by opp*

**physics14**

According to the law of conservation of the angular momentum Iâ€¢ω1 = (I +Io) â€¢ ω2 Mâ€¢R^2/2 â€¢ 2â€¢πâ€¢n1 = (Mâ€¢R^2/2 + mr^2) â€¢ 2â€¢πâ€¢n2 n2= (Mâ€¢R^2/2 â€¢ n1)/ (Mâ€¢R^2/2 + mr^2) (Hz) where M =0.9 kg, R=0.17 m, n1=18 Hz, m =0.18 kg, r =0.087 m
*Thursday, March 22, 2012 at 2:37pm by Elena*

**physics12**

51
*Sunday, December 11, 2011 at 9:09pm by Anonymous*

**PHYSICS'S**

How much heat would it take to change 1.0kg of water at 20°C to steam at 110°C. I can't get the right answer that is 2.6×10^6J. Please tell me how can I solve this problem, I want to learn how to solve These problem plz help me.
*Sunday, March 31, 2013 at 6:28pm by Riana*

**PHYSICS'S**

you have three parts: a. Heat the water to 100C b. vaporize the water at 100C c. heat the steam to 110C a. heat=m*cwater*(100-20) b. heat=m*Hv c. heat=m*csteam*(110-100) cwater is specific heat capacity of water Hv is the heat of vaporization of water. Csteam is specific heat ...
*Sunday, March 31, 2013 at 6:28pm by bobpursley*

**PHYSICS'S**

For (a)336000J (B) 2255j (C) 20000j I added them and the answer is 358255j Which is totally different from the correct answer ....am I doing it right ?
*Sunday, March 31, 2013 at 6:28pm by Riana*

**PHYSICS'S**

No. You have to use units here. What units of mass, specific heat did you use? Notice the units in the table for specific heat, and heat vaporization. That is where You erred.
*Sunday, March 31, 2013 at 6:28pm by bobpursley*

**PHYSICS'S**

OK I converted °C to K but the answer now is 4304530J
*Sunday, March 31, 2013 at 6:28pm by Riana*

**PHYSICS'S**

Did you solved the problem? Is it 2.6×10^6J? I don't know where I am doing it wrong...I checked my work thrice but still the answer is wrong.
*Sunday, March 31, 2013 at 6:28pm by Riana*

**PHYSICS'S**

You did not convert celcius to kelvins. They have the same unit. I will do a) for you heat=1kg*cw*(80C) in my table, cw is is in J/gram*C heat=1000g*4.186J/gC*80C== 334880J b) heat=mass*Hv my table has Hv as 2260 J /g, again mass units is grams Heat=1000*2260=2,260,000 J See ...
*Sunday, March 31, 2013 at 6:28pm by bobpursley*

**PHYSICS'S**

But my table have specific heat in J/kg.k And latent heat in kJ/kg That's why I only converted °c to k and kJ into J
*Sunday, March 31, 2013 at 6:28pm by Riana*

**PHYSICS'S**

Can you please tell me what value of specific heat did you used for q3?
*Sunday, March 31, 2013 at 6:28pm by Riana*

**PHYSICS'S**

Can you please tell me what value of specific heat did you used for q3?
*Sunday, March 31, 2013 at 6:28pm by Riana*

**Physics30**

Changing Momentum The illustrations show two ways of providing impulse to change the momentum of a vehicle. In the top illustration, the vehicle collides with a massive concrete barrier. In the bottom illustration, the vehicle collides with water-filled barrels. *two ...
*Thursday, April 11, 2013 at 2:32pm by alejandro*

**physics30**

A spring is compressed a distance of x. When the spring is released, it shoots a marble of mass m vertically upward from ground level. The maximum height reached by the marble is h. The magnitude of the marbleâ€™s momentum at the highest point of the marbleâ€™s trajectory is ...
*Monday, March 10, 2014 at 2:22am by alejandro*

**physics30**

After performing a trick above the rim of a skateboard ramp, a 56 kg skateboarder lands on the ramp 3.5 m above ground level with a downward velocity of 4.0 m/s. Ep = 0.0 J Ground level. Friction in the wheels of the skateboard and air resistance cause a loss of 9.0 × 10^2 J ...
*Monday, March 10, 2014 at 2:24am by alejandro*

**physics30**

potential energy = m g h = 56*9.81 * 3.5 kinetic energy = (1/2) m v^2 = 28*16 sum to get total energy at top kinetic energy at bottom = (1/2)m v^2 = total energy at top - 900
*Monday, March 10, 2014 at 2:24am by Damon*

**physics30**

not moving so zero
*Monday, March 10, 2014 at 2:22am by Damon*

**AP Physics B**

http://www.collegeboard.com/student/testing/ap/physics_b/samp.html?physicsb If you go to the nearest college bookstore, or BarnesNoble, the study guides are most excellent. http://www.google.com/search?q=barnes+noble+physics+B+study+guide&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla...
*Wednesday, December 16, 2009 at 2:01pm by bobpursley*

**PHYSICSSSSS helpppp please**

Two boxes with different masses M1 = 1.8 kg and M2 = 2.6 kg are tied together on a frictionless ramp surface which makes an angle θ = 21° with the horizontal (see the figure below). What is the tension in the rope connecting the two boxes? N What is the tension in the ...
*Sunday, February 12, 2012 at 2:03pm by Anonymous*

**physics**

A figure with the missing dimensions that you need, and the method of solution, can be found on page 142 of this web site: http://physics.ucsd.edu/students/courses/summer2009/session1/managed/session1/physics1a/documents/ch_8_solutions.pdf
*Sunday, November 11, 2012 at 4:31am by drwls*

**Physics**

http://physics.ucsd.edu/students/courses/summer2009/session1/physics2b/CH29.pdf Problem 6
*Tuesday, October 8, 2013 at 11:20pm by Elena*

**magnets**

Prob. 9 http://www-physics.ucsd.edu/students/courses/winter2010/physics2b/hw/hw8.pdf
*Wednesday, December 18, 2013 at 6:57am by Elena*

**physics**

A bat flying at 5.5 m/s emits a chirp at 35 kHz. If this sound pulse is reflected by a wall, what is the frequency of the echo received by the bat? ______ kHz (Assume the speed of sound is 345 m/s.) thanks for any help
*Monday, August 6, 2007 at 11:42am by physics22*

**PHY**

well, i dont know what angles you've got in your figure, but to find FB use: FBsin(thetaB)=FAsin(thetaA) and solve for FB: FB=FAsin(thetaA) / sin(thetaB) and for the magnitude of FA + FB: FAcos(thetaA) + FBcos(thetaB) hope that helps.
*Monday, September 13, 2010 at 8:23am by physics3a*

**PHY**

If the total force is along the line L (in the figure) then the two x components cancel out and you use that property to find FB by setting the components equal to each other. And since the x components canceled out, the total force is just the sum of the y components, going ...
*Monday, September 13, 2010 at 8:23am by physics3a*

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