Sunday

November 23, 2014

November 23, 2014

Number of results: 1,458

**project physicis**

Hi, I need example of momentum,conservation of momentum and impluse momentum in cricket. Thanks
*May 8, 2011 by nick*

**Please help with Physics Quickly**

1. How are impulse and momentum related? (Points : 1) Impulse is the change in momentum of an object. Momentum is the change in impulse acting on an object. Impulse and momentum are always equal in magnitude. Impulse and momentum are the same thing. Question 2. 2. Which of ...
*January 27, 2014 by Anna*

**Physics ~MOMENTUM~**

a) what is the momentum of a 4.6 kg baseball moving at 1.4 m/s? b) a child is running with a velocity of 4.5 m/s and has a momentum of 120 kgm/s. What is the child's mass? ~formula~ P=mv help please!!!
*February 16, 2013 by Isis*

**Physics - drwls?**

A 2000 kg truck traveling north at 38 km/hr turns east and accelerates to 55 km/hr. What is the change in the truck's kinetic energy? What is the magnitude of the change in the linear momentum of the truck? What is the direction of the change in linear momentum of the truck? (...
*March 19, 2007 by winterWX*

**Physics**

A billiard ball of mass m = 0.250 kg hits the cushion of a billiard table at an angle of θ1 = 56.2 and a speed of v1 = 24.8 m/s. It bounces off at an angle of θ2 = 71.0 and a speed of v2 = 10.0 m/s. (a) What is the magnitude of the change in momentum of the ...
*October 28, 2014 by Anonymous*

**Physics - Angular Momentum**

When the angular momentum changes, the 'change' in the angular momentum vector (ie. dL) is ____. [a.] perpendicular to the torque vector. [b.] parallel to the angular momentum vector. [c.] parallel to the torque vector. .. im confused on this one.. i think it's [A]. am i right...
*April 8, 2007 by COFFEE*

**physics**

Car 1 approaches an intersection with a momentum of p1i=(11,000 kg*m/s)x + (-370 kg*m/s)y. Car 2 approaches the same intersection with momentum p2i= (4,000 kg*m/s)x + (2470 kg*m/s)y. The cars collide and immediately the momentum of Car2 is p2f= (2100 kg*m/s)y. What is the ...
*October 13, 2010 by Anonymous*

**Science**

We are studying energy my questions What happens to the momentum of a car when it comes to a stop? The momentum is transfered to the Earth. Momentum is always conserved. What happens to the momentum of a car when it comes to a stop?
*January 9, 2007 by Mae*

**physics conservation of momentum**

A 0.5 kg ball is thrown horizontally towards a wall with a speed of 10 m/s. The initial velocity is chosen to be the positive x-direction for this question. The ball horizontally rebounds back from the wall with a speed of 10 m/s in the negative x-direction. What is momentum ...
*November 8, 2008 by rachel*

**Physics**

Two rollerbladers throw a frisbie back and forth on a frictionless surface. Which does not change? a. Momentum of an individual rollerblader b. Momentum of the frisbie c. Momentum of the system consisting of the frisbie and rollerbladers throwing the ball d. Momentum of the ...
*April 12, 2009 by Jacob*

**Physics - Momentum**

Define momentum qualitatively and quanititatively. (qualitatively - a measure of an object's mass to resist changes in its velocity or acceleration. Is this correct? How do I define momentum quantitatively)
*August 25, 2010 by Shaila*

**conservation of momentum**

If you have two pucks elastically collide on an air table, and then analyze the momentum vector diagram of the situation, you encounter an increase in momentum. What are possible reasons as to why there was a gain of momentum. Note: Both pucks were pushed from the end of the ...
*November 30, 2008 by Melanie*

**physics**

Suppose a ball of putty moving horizontally with 1kg.m/s of momentum collides and sticks to an identical ball of puffy moving vertically with 1 kg.m/s of momentum. Why is their combined momentum not simply the arithmetic sum, 2 kg.m/s?
*November 8, 2013 by Anonymous*

**science**

Arrange the amount of momentum of these objects from the most momentum to the least momentum. When placing the objects in the correct order, record the value of their momentum. 1. A 0.4 kg baseball thrown by a major league pitcher at 120 m/s. 48kg*m/s 2. A 0.04 kg bullet ...
*October 28, 2009 by please help(:*

**physics intro**

A ball of mass 0.50 kg is thrown straight up at 6.0 m/s. (a)What is the initial momentum of the ball? (b) What is the momentum of the ball at its peak? (c)What is the momentum of the ball as it hits the ground
*October 7, 2014 by ben green*

**Physics**

According to conservation of momentum, when two objects collide, the momentum lost by one object equals the momentum gained by the other. Give a common-sense, non-mathematical explanation of the connection between Newtons 3rd law and momentum conservation. In other words,make...
*March 28, 2011 by Tammy*

**Physics**

According to conservation of momentum, when two objects collide, the momentum lost by one object equals the momentum gained by the other. Give a common-sense, non-mathematical explanation of the connection between Newtons 3rd law and momentum conservation. In other words,make...
*March 26, 2011 by Tammy*

**Physics Momentum**

1) Two 1 kg balls move away from each other, one traveling 5 m/s to the right, the other 5 m/s to the left. What is the magnitude of the total momentum of the system? 2) Two 1000 kg cars drive east; the first moving at 20 m/s, the second at 40 m/s. What is the magnitude of the...
*February 20, 2013 by Isis*

**Physics**

I think I chose the correct answer. In a closed system, two carts have a compressed spring between them. One of the carts has a total mass, including its contents, of 2.0 kg, and the other has total mass of 1.0 kg. Which cart experiences the momentum change of greater ...
*February 3, 2014 by Laura Khoshaba (Me and I)*

**Physics**

A nucleus, initially at rest, decays radioactivly, leaving a residual nucleus. In the process, it emits two paricles horizontally: an electron with momentum 9.0 x 10^-21 kg m/s [E] and a neutrino with momentum 4.8 x 10^-21 kg m/s [S]. In what direction does the residual ...
*November 5, 2010 by Jordge*

**Astronomy**

Black holes can be completely described by which three parameters? -angular momentum, spin, and electric charge -angular momentum, density, and radius -mass, angular momentum, and electric charge -mass, angular momentum, and radius
*March 16, 2013 by qwerty*

**physics**

Using that velocity, and the information from above, compare the total momentum just before the collision with the total momentum after the collision. (again let the masses of the balls be m) , it is a lab question , i was just wondering what formula to use for the momentum
*June 7, 2014 by grey*

**physics**

A ball attached to the end of a string is whirled on a horizontal circle at constant speed. Consider the linear momentum, total energy, and kinetic energy of the ball throughout its motion. Which of the following statements is true? Both linear momentum and kinetic energy are...
*January 6, 2010 by hilary*

**physics**

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) larger than the change in momentum of the larger mass. C) zero. D) equal to the ...
*December 2, 2006 by tyler*

**physics**

A small ball with a mass of 0.05 kg moves along a circular orbit with a radius of 0.9 m at a speed of 9.0 m/s. What is the angular momentum of the ball? If the angular momentum of this ball were quantized in the same manner as the angular momentum of electrons in the Bohr ...
*April 22, 2014 by Anonymous*

**Physics - Momentum**

Under what circumstances is the change in momentum of a system equal to zero?
*September 1, 2010 by Shaila*

**Science**

Explain how a parachutist's loss of momentum on landing is consistent with the principle of conservation of momentum?
*September 2, 2012 by Mariam*

**physics**

Explain how a parachutist's loss of momentum on landing is consistent with the principle of conservation of momentum?
*September 5, 2012 by Mariam*

**Physics-Momentum**

Baseball 0.14 kg moving at 35 m/s. Momentum of the ball? this should be easy b/c i know p=m*v but i get 4.9 kgm/s and it's wrong.....
*January 7, 2013 by Sierra*

**science**

how is this equation derived from the momentum principle? In the near-Earth orbit the rate of change of momentum is (v/R)p = (v/R)mv
*July 11, 2014 by sally*

**Physics.**

What is the transfer mechanism of energy, momentum, and angular momentum?
*November 27, 2011 by Kristin*

**science**

Which way is the momentum occuring if a child is riding a merry go round at a constant speed. So for example at each 4 "sides" of the merry go round which direction is momentum . I know the velocity is always tangent to the circle at a specific point. does the momentum go in ...
*July 2, 2014 by sara*

**Physics**

A 1.1 kg particle-like object moves in a plane with velocity components Vx = 30 m/s and Vy = 90 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the origin at this moment? _____ kg*m^2/s k (b) What is its...
*March 30, 2007 by COFFEE*

**physical**

What is the electrons velocity that made its momentum equal to the momentum of photon whose wave length 5200A?
*December 28, 2011 by dany*

**physics**

a 2.5 kg rifle fires a 20 g bullet at 400 m/s. What is the magnitude of the recoil velocity of the rifle? I still don't understand. Could you please help with a formula? Thank you. physics - drwls, Monday, February 7, 2011 at 6:38pm Try using conservation of momentum. recoil ...
*February 7, 2011 by Sejul*

**science**

Explain why a bullet with a mass of 15 grams and a velocity of 400 m/s has more momentum than you at rest. Calculate the momentum for both.
*September 28, 2010 by Ashley*

**Physics**

What is the momentum (in kg m/s) of a 131- kg football player running at a top speed of 9.9 m/s? What is the momentum of a 9.32- g rifle bullet traveling at 618 m/s
*November 4, 2014 by Laura*

**Physics: Collison/Momentum Problem**

A 15 kg mass, moving east at 5 m/s, collides elastically with another 10 kg mass, moving west at 1 m/s. After the collision, the larger mass moves off with a velocity of 3 m/s. What is the final velocity of the smaller mass? Is it 4m/s? Or would it be 2m/s? Do you add the ...
*January 25, 2012 by Cicilia*

**Angular Momentum**

2.0 kg particle-like object moves in a plane with velocity components vx = 30 m/s and vy = 35 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the origin at this moment? kgm2/s k (b) What is its angular...
*November 9, 2010 by Xavier Hernandez*

**momentum**

do gamma rays carry momentum? i thought they dont because they dont have mass so mv=0 but my frend says even tho they dont have mass they still carry momentum. how does this make sense? please help.
*June 2, 2009 by Tiffany*

**Physics**

Two masses, m1 = 2.0 kg and m2 = 3.3 kg, are moving in the xy-plane. The velocity of their center of mass and the velocity of mass 1 relative to mass 2 are given by the vectors vcm = (−1,+2.2) m/s and vrel = (+4.5, +1.0) m/s. (a) Determine the total momentum of the ...
*October 11, 2011 by mymi*

**Momentum Physics**

The fastest helicopter, the Westland Lynx, has a mass of 3.343 x 103 kg and a maximum momentum of 3.723 x 105 kg.m/s. What is its top speed?
*March 19, 2012 by Anonymous*

**physics**

A body of mass 4 kg is dropped from a height of 20m .calculate the initial momentum and the momentum just before it strikes the ground (g=10m/s*s)
*October 18, 2014 by mariya*

**physics**

Particle 1 with a momentum of 126.2 kgm/s along the x axis, strikes particle 2, which is initially motionless. After the collision, particle 1 has an x component of momentum, p1x = 82.0 kgm/s and a y component, p1y = 46.8 kgm/s. What are p2x and p2y, the x and y momentum ...
*October 16, 2013 by Anonymous*

**physics**

a 2 kilogram rifle initially at rest fires a 0.002 kilogram bullet. as the bullet leaves the rifle with a velocity of 500 meters per second, what is the momentum of the rifle bullet system? isn't the answer one because final momentum minus initial momentum is 1-0 which is one
*January 6, 2011 by john*

**physics**

A pole-vaulter runs toward the launch point with horizontal momentum. Where does the vertical momentum come from as the athlete vaults over the crossbar?
*February 12, 2010 by Teri*

**physics # 2**

2. A particle of mass m and speed v collides at right angles with a very massive wall in a perfectly elastic collision. The magnitude of the change of momentum of the particle is a.) zero b.) mv/2 c.) mv d.) (2) mv e.) 2mv Hint: the final momentum is equal in magnitude and ...
*August 7, 2007 by gomez*

**Physics**

Please Help ! A child throws a snowball at a tree and it sticks to the tree. Does this motion defy the Law of Conservation of Momentum? Explain. The Law of Conservation of Energy states: "If there is no net force acting on a system of objects, the total momentum in that system...
*November 9, 2009 by Rachel *

**physics**

Q A man throws a ball weighing 500g vertically upwards witha speed of 10m/s. 1) what will be its initial momentum? 2) What would be its momentum at the highest point of his flight?
*November 11, 2011 by asd*

**physics**

Q A man throws a ball weighing 500g vertically upwards witha speed of 10m/s. 1) what will be its initial momentum? 2) What would be its momentum at the highest point of his flight?
*November 11, 2011 by asd*

**Physics**

A ball traveling with an initial momentum of 2.5 kg*m/s bounces off a wall and comes back in the opposite direction with a momentum of -2.5 kg*m/s. What impulse would be required to produce this change?
*March 10, 2014 by Amanda*

**physics**

A 1000 kg car in neutral gear slow from 15 m/s to a stop in 5.0 s due to the force of friction. A. What was the acceleration of the car. B. What was the cars initial momentum? C. What was its final momentum? D. What was the change in momentum of the car? E. What was the ...
*October 23, 2011 by Anonymous*

**Physics**

A 2.1 kg particle-like object moves in a plane with velocity components vx = 30 m/s and vy = 55 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the origin at this moment? kg m2/s (b) What is its ...
*July 30, 2010 by Andre*

**physics**

The speed of a basketball as it is dribbled is the same when the ball os going toward tthe floor as it is when the ball rises from the floor. A. Is the basketball's change in momentum equal to zero when it hits the floor? B. If not, in which direction is the change in momentum...
*February 12, 2010 by Teri*

**PHYSICS (most is worked)**

A glass ball, ball A, of mass 6.0 g moves at a velocity of 18.0 cm/s. It collides with a second ball, ball B, of mass 8.0 g, moving along the same line of velocity of 11.0 cm/s. After the collision, ball A is still moving, but with a velocity of 10.0 cm/s. Ball A's original ...
*January 28, 2013 by Jessica*

**Physics**

A 4 kg mass is sliding on a fricitonless surface and explodes into two, 2 kg parts. One moving at 3 m/s due north and the other at 5 m/s 30 degrees north of east. What is the original speed of the mass? Can you please verify if my answer is correct? I used mV_0 = 2(3) =[cos30(...
*February 9, 2007 by sarah*

**Physics**

A child throws a snowball at a tree and it sticks to the tree. Does this motion defy the Law of Conservation of Momentum? Explain. I'm thinking yes. Given that p(momentum)= mass x velocity, even though the tree is stationary, it would have a much greater momentum due to it's ...
*November 9, 2009 by Jon*

**momentum/impulse**

The following data concerns a tennis ball at a given instant before it is struck by a tennis racket; horizontal momentum of tennis ball= 2.4Ns kinetic energy of ball= 45J a) why is correct to give the direction of the momentum but not the kinetic energy b) write down in terms ...
*October 15, 2006 by Kim*

**Re: Physics**

Posted by COFFEE on Friday, March 30, 2007 at 4:25am. A 1.1 kg particle-like object moves in a plane with velocity components Vx = 30 m/s and Vy = 90 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the ...
*March 31, 2007 by COFFEE*

**physics**

Starting at = 0 , a horizontal net force 0.265 (-0.445 is applied to a box that has an initial momentum -2.95 3.85 . What is the momentum of the box at = 2.15 ?
*November 29, 2011 by Hasan*

**physics**

If a 2kg car with a momentum of 12kg m/s collides with a stationary 4kg car, the total momentum after the collision will be?
*September 18, 2014 by Jean*

**physics**

A cart has a momentum of 10. kilogram meters per second east before a collision and a momentum of 5.0 kilogram meters per second west after the collision. The net charge in momentum of this cart is ? I am not sure how to solve.
*January 5, 2013 by Sunny *

**10 grade**

A 80 slug car runs into a wall while moving at 10ft/s. If the car bounces off the wall with the same speed it struck it with as a result of having been in contact with the wall for .8 second, then find... a)... The initial momentum of the car b)... The final momentum of the ...
*February 10, 2011 by sravya*

**physics**

A 5.0 N force directed to the west acts on an object for 2.0 seconds. What is the change in momentum of the object? Do I have to divide 5.0 by 2.0 in order to get the momentum or multiply?
*April 21, 2010 by Samantha*

**physics**

a ball falls vertically onto a floor , with momentum p,and then bounces repeatedly.the co-efficient of restitution is e.the total momentum imparted by the ball is
*April 11, 2012 by srikala*

**physics**

A compact car, mass 705 kg, is moving at 1.00 102 km/h toward the east. Sketch the moving car. Do this on paper. Your instructor may ask you to turn in this work.. (a) Find the magnitude and direction of its momentum. Draw an arrow on your sketch showing the momentum. kg m/s...
*December 6, 2010 by max*

**physics**

A compact car, mass 705 kg, is moving at 1.00 102 km/h toward the east. Sketch the moving car. Do this on paper. Your instructor may ask you to turn in this work.. (a) Find the magnitude and direction of its momentum. Draw an arrow on your sketch showing the momentum. kg m/s...
*December 6, 2010 by max*

**physics**

what's the area under a force-vs-time curve: momentum, impulse, or velocity? Impulse. (It happens to equal the change in momentum, as well) i thought so.. thanks for the clarification.
*March 21, 2007 by terrence*

**Physics**

A glass ball, ball A, of mass 6.0 g moves at a velocity of 19.0 cm/s. It collides with a second ball, ball B, of mass 9.0 g, moving along the same line of velocity of 11.0 cm/s. After the collison, ball A is still moving, but with a velocity of 8.0 cm/s. a) What was ball A's ...
*November 7, 2007 by Jessica*

**Physics**

momentum equals = mass (velocity) yet for problems I end up using this P = m (delta v) what allows us to simply put the delta infront of the v to find the momentum?
*October 3, 2009 by Physics*

**special relativity **

A projectile of rest mass M1, total energy E1, and momentum p1, is directed at a stationary target of mass m2. Find the the velocity of the centre-of-momentum frame .
*June 7, 2011 by Deforest *

**science**

a bullet has a momentum of 20kg*m/s -How fast would a car weighing 1200 kg should be moving to have the same momentum as the bullet expressed in miles/hr?
*October 28, 2011 by ann*

**Angular momentum**

What is the angular momentum if the force is 72 N, the time is 1.5seconds and the lever arm is 3.2 meters?
*April 13, 2013 by Shelly*

**Physics**

You drop an egg from rest with no air resistance. As it falls, a. only its momentum is conserved. b. only its kinetic energy is conserved. c. both its momentum and its mechanical energy are conserved. d. its mechanical energy is conserved, but its momentum is not conserved
*March 5, 2011 by Joe *

**Physics**

A 0.28 kg softball has a velocity of 16 m/s at an angle of 34 below the horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball while it is in contact with the bat if the ball leaves the bat with a velocity of (a) 21 m/s...
*May 13, 2014 by John*

**Physics**

A 3.00 kg object with an intial velocity of + 5.00 m/s in the postive X direction collides with and sticks to a 2.00 kg object with an intial velocity of -3.00 m/s in the negative Y direction. Find the final componet of velocity of the composite object. Use the conservation of...
*December 11, 2006 by Harry*

**physics**

A person is driving an automobile at 95 km/h and throws a bottle of mass .600 kg straight out the window. a) With what momentum does the bottle hit the roadway sign? b) With what momentum does the bottle hit an oncoming automobile traveling in the opposite direction at 85 km/h...
*July 16, 2012 by Oja*

**physics**

It is possible for the velocity of a rocket to be greater than the exhaust velocity of the gases it ejects. When that is the case, the gas velocity and momentum are in the same direction as the rocket's. How does the rocket still obtain thrust by ejecting the gases? Before the...
*August 18, 2007 by manny*

**physics**

Which one of the following statements is true for two bodies having same kinetic energy but different masses? a. they have same velocity b. they have same momentum c. the momentum of smaller mass body is smaller than the other d. the momentum of smaller mass body is larger ...
*June 14, 2012 by Jeremy *

**Physics**

What does it mean to say that angular momentum is conserved? Give an example you might see on Earth. How could conservaton of angular momentum help astronomers understand the development of the solar system?
*October 14, 2009 by Riley*

**Physics**

What does it mean to say that angular momentum is conserved? Give an example of what you might see on Earth. How could conservation of angular momentum help astronomers understand the development of the solar system?
*October 14, 2009 by Kayla*

**physics**

12. Which of the following statements is correct for a particle moving in a horizontal circle with constant angular velocity? A. The linear momentum is constant but the kinetic energy varies. B. The kinetic energy is constant but the linear momentum varies. C. Both kinetic ...
*November 1, 2013 by shanza*

**Physic 30**

INFORMATION: Kathy and Bill collided at an intersection. The police learned the mass of the truck is 3200 kg and the mass of the car is 2800 kg. Based on the length of the skid marks at the scene and the mass of the vehicles, police estimate that the combined mass was moving ...
*April 3, 2013 by Tori*

**1**

A 3.00-kg particle has a velocity of (3.00 - 4.00 ) m/s. (a) Find its x and y components of momentum. (b) Find the magnitude and direction of its momentum.
*November 13, 2010 by moh*

**Physics**

A woman with a mass of 50kg is standing on the rim of a large disk that is rotating at an angular velocity of .50 rev/s about an axis through its center. The disk has a mass of 110kg and a radius of 4.0m. Calculate the magnitude of the total angular momentum of the woman-plus-...
*March 27, 2007 by Karla*

**physics**

A 1200.0kg car is moving east at 30.0 m/s and collides with a 3600.0 kg truck moving at 20 m/s in a direction 60 degrees north of east.The vehicles interlock and move off together.Find their common velocity. Use the law of conservation of momentum. The resultant momentum of ...
*September 23, 2006 by fluffy*

**Science **

A spinning star begins to collapse under its own gravitational pull. Which one of the following occurs as the star becomes smaller? 1.Its angular velocity decreases. 2.Its angular momentum increases. 3.Its angular velocity remains constant. 4. Its angular momentum remains ...
*October 4, 2010 by Franco Krause*

**PHYSICS**

A truck has a momentum of 5.8x10^4 Ns [S]. An average force of 2.2x10^3 N [S] increases the truck's momentum for the next 8.8s. What is the impulse and final speed of the truck?
*April 5, 2013 by R*

**Physics**

two objects collide when sliding on a fricitonless horizontal surface. Which quantity is conserved during their collision? a) velocity b) momentum of both objects c)energy d) momentum of each object isn't c) or b) correct? I really think it's c)
*November 14, 2007 by Andrea*

**physics**

Two objects are approaching an intersection. One is a 50 kg traveling at 8 m/s from east to west and the other is a 40 kg going from south to north at 12 m/s. (a) Find the x and y components of the net momentum of this system. (b) What are the magnitude and direction of the ...
*January 14, 2013 by tami*

**Physics**

Two balls undergo inelastic collision. The y-momentum after the collision is 98 kilogram meters/second, and the x-momentum after the collision is 100 kilogram meters/second. What is the magnitude of the resultant momentum after the collision?
*June 15, 2012 by Christine*

**physics**

pls explain this to me ? "momentum is inertia....but inertia is NOT momentum" :S confused
*December 9, 2012 by Anya *

**physics**

What is an example of an object with great momentum? Why does it have great momentum?
*January 26, 2013 by Anonymous*

**POP**

2. A truck moves with a certain momentum. If both its speed and its mass are doubled, how much greater is its momentum? A) Two times. B) Four times. C) Eight times. D) Unchanged, the same.
*February 19, 2012 by Anonymous*

**principles of physics**

A truck moves with a certain momentum. If both its speed and its mass are doubled, how much greater is its momentum? A) Two times. B) Four times. C) Eight times. D) Unchanged, the same.
*February 19, 2012 by britches*

**PHYSICS PLEASE HELP!!**

A radioactive nucleus at rest decays into a second nucleus, an electron, and a neutrino. The electron and neutrino are emitted at right angles and have momenta of 9.1510−23 kg . m/s and 5.1910−23 kg . m/s, respectively. 1.)What is the magnitude of the momentum of...
*November 20, 2011 by paul*

**physics**

Determine for each of the following statements whether it is always true or can be false. In a perfectly inelastic collision, the kinetic energy is conserved. Kinetic energy is conserved in an elastic collision. Two objects of different masses but moving at the same velocity ...
*March 2, 2012 by Katie*

**U. Phys**

What is the angular momentum of a 3.7kg uniform cylindrical grinding wheel of radius 25cm when rotating at 1500rpm? How much torque(in magnitude) is required to stop it in 5.0s? Could you explain this in detail, I don't really understand torque and momentum well.
*November 2, 2009 by Taylor*

**Physics**

A disk with a rotational inertia of 7 kgm^2 rotates like a merry-go-round while undergoing a torque given by (5+2t)Nm. At time 1s, its angular momentum is 5kg m^2/s. what is its angular momentum at 3s? I can't figure out how to start this problem.
*April 27, 2011 by Zack*

**Physics (Momentum)**

Can anyone please help me with this question? I don't understand why the speed is v m/s. A sport utility vehicle is travelling at a speed of v m/s. If its momentum has a magnitude of 32,800 kgm/s, what is the SUV's mass? Thanks I know that I have to use the formula p= m*v and...
*May 2, 2013 by Kathy*

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