Tuesday

December 1, 2015
Number of results: 49,281

**Kinetic energy**

steel ball of mass 0.310 kg is fastened to a cord that is 86.0 cm long and fixed at the far end. The ball is then released when the cord is horizontal, as shown in the figure. At the bottom of its path, the ball strikes a 3.10 kg steel block initially at rest on a ...
*April 26, 2015 by Anonymous*

**Physics**

A 6.00 kg ball (ball 1), moving to the right at a velocity of +1.00 m/s on a frictionless table, collides head-on with a stationary 7.50 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 m/s ball 2 m/s...
*November 2, 2008 by Brandon*

**Physics**

A low friction cart of mass m, traveling at speed v, collides (perfectly) elastically with a cart of triple the mass, initially at rest. What is the result of this collision? (What are the final, after-collision velocities?) Do NOT use the derived equations from the textbook. ...
*August 10, 2012 by Chad*

**college physics**

A truck of mass 9M is moving at a speed v = 15 km/h when it collides head on with a parked car of mass M. Spring mounted bumpers ensure that the collision is essentially elastic. Find the final velocities of each vehicle. Repeat for the case of the car moving at speed v= 15 km...
*May 14, 2010 by Adam*

**physics please help**

A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 ball 2 (b) ...
*November 2, 2010 by jason*

**Physics**

A 1000 kg car is moving at a constant speed of 7 m/s when it hits the back bumper of another car with 1200 kg of mass moving in the same direction at a constant speed of 6 m/s. As a result of the collision both bumpers get coupled. Show all work and calculations. 1. What is ...
*January 6, 2012 by Will*

**Science**

A car is moving at a constant velocity when it is involved in a collision.the car comes to rest after 0.45sec with an average acceleration of 65,0 m/s2 in the direction opposite that of the car's velocity. What was the speed ,in km/h, of the car before the collision?
*March 8, 2013 by Gift*

**Physical Science**

Two 125 kg bumper cars are moving toward each other in opposite directions. Car X is moving at 10 m/s and Car Z at –12 m/s when they collide head–on. If the resulting velocity of Car Z after the collision is 10 m/s, what is the velocity of Car X after the collision?
*February 14, 2011 by Helen*

**physics**

a 4.0-kg cart rolling east on a level, frictionless track at 14 m/s collides with a stationary 3.0-kg cart. After the collision, the 4.0-kg cart is still rolling east, now at a speed of 2.0 m/s. Was this collision elastic or inelastic?
*December 1, 2012 by anonymous*

**physics**

A jet airliner moving initially at 300 mi/h due east enters a region where the wind is blowing at 100 mi/h in a direction 26.0° north of east. What is the new velocity of the aircraft relative to the ground? in m/h at degrees North of east.
*June 2, 2008 by Elisa*

**physics**

A 1.0 kg red superball moving at 5.0 m/s collides head-on with stationary blue superball of mass 4.0 kg in an elastic collision. What are the final velocities of the two superballs after the collision?
*November 20, 2009 by anonymous*

**Physics**

Which of the following involves a non-zero net force? I. A hockey-puck sliding at a constant speed on ice. II. The earth revolving around the sun at a constant speed. III. An object falling near the surface of the earth. A) I only B) III only C) Both I and II D) Both II and ...
*October 13, 2011 by Astrogirl*

**Physics**

A 55 kg ice skater, initially at rest on a flat skating rink, requires a 198 N horizontal force to be set in motion. However, after the skater is in motion, a horizontal force of 175 N keeps her moving at a constant velocity. Find the coefficients of static and kinetic ...
*December 5, 2006 by Anonymous*

**Physics **

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 = 17.0 kg and an initial velocity of VoA = 8.15 m/s, due east. Object B, however, has a mass ...
*March 5, 2015 by Jennifer*

**physics**

a mass m1 moves along the x-axis with velocity of magnitude v0 on a frictionless table. it strikes another mass m2 which is initially at rest. the mass m1 goes off along the the y-axis. if half the original kinetic energy is lost in the collision, with what speed and at what ...
*November 30, 2010 by shamrakh*

**physics**

A glider with a mass of 3 kg is moving rightward at a speed of 2 m/s on a frictionless horizontal air track. It collides with a stationary glider whose mass is 18 kg. If the collision is elastic, what is the speed of the gliders after the collision? Use SI units in your answer...
*March 12, 2014 by Anonymous*

**Physics**

A rock (m = 1.5 kg) moving at 4.2 m/s north collides with a ball (m = 0.061 kg) that is initially at rest. What is the velocity of the rock after the collision if the velocity of the ball after the collision was 8.4 m/s north?
*January 15, 2012 by Zach*

**physics**

001 (part 1 of 2) 10.0 points An 86 kg fullback moving east with a speed of 5.5 m/s is tackled by a 97 kg opponent running west at 3.6 m/s, and the collision is perfectly inelastic. a) What is the velocity of the players immediately after the tackle? Answer in units of m/s. ...
*January 5, 2010 by Anonymous*

**physics**

Two cars approach an ice-covered intersection. One car, of mass 1.22 103 kg, is initially traveling north at 10.6 m/s. The other car, of mass 1.69 103 kg, is initially traveling east at 10.6 m/s. The cars reach the intersection at the same instant, collide, and move off ...
*November 29, 2012 by Anthony*

**physics**

Billiard ball A of mass m_A = 0.130 kg moving with speed v_A = 2.50 m/s strikes ball B, initially at rest, of mass m_B = 0.145 kg. As a result of the collision, ball A is deflected off at an angle of 31.0 degree, with a speed v_A1 = 2.05 m/s. Write down the equation expressing...
*April 24, 2012 by Caylee*

**General Physics**

A 0.500 kg sphere moving with a velocity (2.00i - 3.50j + 1.00k) m/s strikes another sphere of mass 1.50 kg moving with a velocity (-1.00i + 2.00j - 2.80k) m/s. (a) If the velocity of the 0.500 kg sphere after the collision is (-1.00i + 3.00j - 8.00k) m/s, find the velocity of...
*December 1, 2011 by LadyJ*

**Physics**

A railroad car with a mass of 12400 kg collides and couples with a second car of mass 18700 kg that is initially at rest. The first car is moving with a speed of 7.7 m/s prior to the collision. (a) What is the initial momentum of the first car? (b) If external forces can be ...
*July 7, 2014 by Anonymous*

**Physics**

Two blocks of masses m1 = 2kg. and m2 = 4kg. are each released from rest at a height of h = 5m. on a frictionless track, and undergo an elastic head-on collision. a)Determine the velocity of each block just before the collision. b) Determine the velocity of each block ...
*April 20, 2013 by Annette*

**physics**

A 66.0 kg man is ice-skating due north with a velocity of 5.70 m/s when he collides with a 36.0 kg child. The man and child stay together hand have a velocity of 2.20 m/s at an angle of 33.0° north of east immediately after the collision. What was the velocity of the child ...
*November 22, 2010 by Please Help!*

**Physical Science-Can someone check my answers?**

1) The kinetic energy of an object depends on which of the following? A. the object’s mass and direction B. the object’s speed and mass---------- C. the object’s work and direction D. the object’s speed and work 2) In the following situations, which one does not have kinetic ...
*February 18, 2014 by dark1*

**physics**

Ball 1, with a mass of 100g and traveling at 12 m/s , collides head on with ball 2, which has a mass of 340g and is initially at rest. What are the final velocities of each ball if the collision is perfectly elastic? What are the final velocities of each ball if the collision ...
*October 18, 2009 by Dan*

**Physics**

A 79.0-kg fullback running east with a speed of 4.00 m/s is tackled by a 93.0-kg opponent running north with a speed of 3.00 m/s. (a) Why does the tackle constitute a perfectly inelastic collision? (b) Calculate the velocity of the players immediately after the tackle. ...
*October 4, 2011 by Allie*

**AP Physics **

Hi! Thank you very much-- I know this is a 2dimensional inelastic collision but i'm not sure how to solve-- "The mass of a blue block is 20% greater than the mass of the green block. Before colliding, the blocks approach each ther with momenta of equal magnitudes and opposite ...
*November 21, 2010 by APpreciative student*

**physics**

A physics student playing with an air hockey table (a frictionless surface) finds that if she gives the puck a velocity of 5.30 m/s along the length (2.80 m) of the table at one end, by the time it has reached the other end the puck has drifted 5.19 cm to the right but still ...
*March 4, 2012 by Nick*

**Physics (Elastic Collision)**

A 0.400 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with half the original speed of the first ball. (a) What is the mass of the second ball? (b) What fraction of the original kinetic energy (KE/KE) gets ...
*October 29, 2006 by Haley*

**Physics**

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 = 17.9 kg and an initial velocity of = 8.82 m/s, due east. Object B, however, has a mass of mB...
*November 4, 2012 by Tim*

**physics**

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 = 17.5 kg and an initial velocity of = 8.50 m/s, due east. Object B, however, has a mass of mB...
*October 10, 2013 by Ray*

**Physics**

A hockey player's arm and stick form a 1.6 m rigid segment. If the angular speed of the player's arm/stick is 1.2 rad/s, determine the resultant velocity of a motionless puck that is hit struck on if: a) the hockey player is stationary during the swing b) the hockey player is ...
*November 7, 2013 by Tori*

**physics**

A 10 kg cart was observed moving north with a speed of 15 m/s before it collided with an identical cart at rest. The collision was observed to cause the carts to couple and move together as one. What is in Joules the kinetic energy of the system of both carts after the collision?
*September 20, 2011 by Elisabeth*

**physics**

A 1 kg mass moving to the right at a speed of 10m/s collides head-on in a perfectly inelastic collision with a stationary 2kg mass. How much KE is lost during the collision? First I found V_f to be 3.3m/s then I found KE_i=1/2m_1v_1i^2 +1/2 m2V_2i^2 =1/2(1)(10)^2 +1/2(2)(0)^2...
*October 24, 2007 by Tammy*

**physics**

A 49-g bullet traveling at 290m/s penetrates a block of ice at 0∘C and comes to rest within the ice.Assuming that the temperature of the bullet doesn't change appreciably, how much ice is melted as a result of the collision? The heat of fusion of water is 333 kJ/kg.
*June 4, 2014 by Anonymous*

**Physics**

Use principles of force and kinematics to answer these: a. A 40 kg skater pushes on the 60 kg skater (initially at rest). As they collide, the 40 kg skater pushes on the 60 kg skater, applying a force 100 Newtons for 1.2 seconds. Find the velocity at which each of them ends up...
*November 1, 2010 by jen*

**physics**

Use principles of force and kinematics to answer these: a. A 40 kg skater pushes on the 60 kg skater (initially at rest). As they collide, the 40 kg skater pushes on the 60 kg skater, applying a force 100 Newtons for 1.2 seconds. Find the velocity at which each of them ends up...
*November 1, 2010 by jen*

**physics**

A block of ice at 0°C whose mass initially is m = 48.4 kg slides along a horizontal surface, starting at a speed vo = 4.91 m/s and finally coming to rest after traveling a distance d = 12.28 m. Compute the mass of ice melted as a result of the friction between the block and ...
*April 15, 2012 by anonymous *

**physics **

A 63-kg ice-skater glides with a speed of 10 m/s toward a 14-kg sled at rest on the ice. The ice-skater reaches the sled and holds on to it. The ice-skater and the sled then continue sliding in the same direction in which the ice-skater was originally skating. What is the ...
*March 30, 2011 by kevin *

**physics**

Two frisky grasshoppers collide in midair at the top of their respective trajectories and grab onto each other, holding tight thereafter. One is a robust 250 g beast initially moving south at 20.0 cm/s, while the other is a svelte 150 g creature initially moving north at 60.0 ...
*October 28, 2009 by physics studentt*

**PHYSICS**

A Few questions- please help!!! also show steps! What magnitude of force, acting for 0.025 s, will change the velocity of a 100 g ball from 30 m/s eastward to 40 m/s westward? A girl holds a 1.7 kg air rifle loosely and fires a bullet of mass 2 g. The muzzle velocity of the ...
*January 4, 2012 by Dyl*

**physics**

65.0-kg person throws a .045kg snowball forward with a ground speed of 30.0 m/s. a second person with a mass of 60.0-kg catches the snowball. both people are on skates. the first person is intially moving forward wit ha speed of 2.50 m/s and the second person is initially at ...
*November 2, 2010 by bailey*

**physics**

Two identical small marbles A and B can be seen. A is at rest while B moves towards A at uniform velocity. The track is smooth towards left of P while it offers a resistance of 0.1 m/s2 towards its right. After some time, the marbles are seen at rest 25cms apart. After ...
*September 20, 2014 by rahul*

**physics**

A glider of mass m1 = 10.0 kg initially moving towards the right at a speed of v1i = 2.00 m/s on a frictionless airtrack collides with a spring attached to a second glider of mass m2 = 4.0 kg initially moving toward the left with a speed of v2i = 5.00 m/s. The spring constant ...
*November 26, 2006 by nicole*

**physics please help **

One lump of clay traveling at 14.98 m/s overtakes a second lump traveling at 4.98 m/s. After collision they are stuck together. To the nearest tenth of a m/s what is their common velocity? -------------------------------------------------------------------------------- 4 If ...
*May 22, 2013 by blah physics*

**PHYSICS**

An automobile accident investigator needs to determine the initial westerly velocity of jeep (m=1720 kg) that may have been speeding before colliding head-on with a Volkswagen (m=1510 kg) that was moving with a velocity of 75.7 km/h east. The speed limit on this road is 90 km/...
*December 27, 2014 by Tony*

**Math 8R - HW Qs. Check**

Fill in the numbers to continued the pattern. 1000, 900, 700, 400, ____, -500, _____ My Answer - 1000, 900, 700, 400, 0 , -500, 1000 1000 - 100 = 900 900 - 200 = 700 700 - 300 - 400 400 - 400 = 0 0 - 500 = -500 -500 - 600 = -1,100 Is my answer is correct???
*September 6, 2012 by Laruen *

**Physics**

1. A 0.50 kg ball is moving with a velocity of 8.0 m/s along a horizontal floor. It hits another ball with a mass of 0.80 kg and moving at 10.0 m/s in the opposite direction. If the first ball bounces back with a velocity of 12 m/s, with what velocity and in what direction ...
*September 17, 2014 by Ryzza*

**@damon physics**

I was wondering if you can help me with these two questions. Thank you Question # 1 A horse is pulling a heavy cart up a hill. The cart has 400 kg of mass inside it. The horse is pulling the cart with 10 N of force. What is the magnitude of the force on the horse due to the ...
*April 22, 2012 by Teal*

**Physical Science**

a player uses a hockey stick to increase the speed of a 0.200 kg hockey puck by 6 m/s in 2 seconds is the acceleration 3 m/s2?
*April 14, 2010 by Derek*

**blue bells model school **

Science physics A ball A moving with kinetic energy E makes a head on elastic collision with a stationary ball with mass n times that as A . What is the potential enery stored during collision ?
*July 19, 2015 by kanika*

**Physics**

I need help with part b... I found in part a that delta L is .29568m and I think I might be doing something wrong with the units because I can't get the right answer. A 156 g hockey puck is attached to a rubber band and rotated with an angular speed of 12.8 rad/s on ...
*December 5, 2010 by Anonymous*

**physics**

A cue ball initially moving at 2.6 m/s strikes a stationary eight ball of the same size and mass. After the collision, the cue ball’s ﬁnal speed is 1.3 m/s.Find the cue ball’s angle θ with respect to its original line of motion. Consider this to be an elastic ...
*February 9, 2014 by Anonymous*

**physics**

A small, 300g cart is moving at 1.60m/s on an air track when it collides with a larger, 2.00kg cart at rest. After the collision, the small cart recoils at 0.820m/s. What is the speed of the large cart after the collision?
*October 8, 2010 by mike*

**physics **

A small, 250\g cart is moving at 1.50m/s on a frictionless track when it collides with a larger, 4.00kg cart at rest. After the collision, the small cart recoils at 0.890m/s . What is the speed of the large cart after the collision?
*November 5, 2014 by sam NEED HELP!*

**physics**

A collision in Phystown is being analyzed by the O.P.P. accident analysis team. A 1000 kg Toyota known to be moving at 65 km/h [W] collided at an intersection with a 3000 kg SUV moving [N]. After the collision, the two vehicles "stuck" together and the police estimate that ...
*June 4, 2014 by grey*

**physics please help**

a 10.0-g marble rolls to the left with a velocity of magnitude 0.400 m.s^-1 on a smooth, level surface and makes a head-on collision with a larger 30.0-g marble rolling to right with a velocity of magnitude 0.100 m.s^-1. If the collision is perfectly elastic,find the velocity ...
*April 12, 2012 by taylor*

**physics**

A small, 300 g cart is moving at 1.90 m/s on an air track when it collides with a larger, 2.00 g cart at rest. After the collision, the small cart recoils at 0.820 m/s. What is the speed of the large cart after the collision?
*November 4, 2010 by Danielle*

**physics**

A 50g ice cube is added to 110g of water in a 62g aluminum cup. The water and cup initially have a temperature of 23°C. Find the initial temperature of the ice cube such that all of the water is just turned to ice. Use the following specific heats: water = 4186 J/(kg•K), ice...
*June 29, 2010 by sandhya*

**physics**

Find the position and velocity of a particle at t = 1.92 s if the particle is initially moving east at a speed of 18.4 m/s and experiences an acceleration of magnitude 3.96 m/s2, directed west.
*January 31, 2013 by Meg*

**Physics**

please can u check my answer Here are the questions: 1. A 0.45 kg book is resting on a dessktop 0.64 m high. Calculate the book's potential energy relative to a)the desktop? b)the floor. 2. A 0.636 kg basketball has a potential energy of 19J at teh basket. How high is teh ball...
*April 9, 2011 by Anonymous*

**physics**

a glider with a mass of 5 kg is moving to the right on a horizontal frictionless surface at 6 m/s when it collides with a 8 kg glider that is at rest. After the collision, the 8kg glider is moving to the right at 6 m/s. what are the speed and direction of the 5 kg glider ?
*December 3, 2014 by Alex*

**Physics**

A cue ball (mass = 0.150 kg) is at rest on a frictionless pool table. The ball is hit dead center by a pool stick which applies an impulse of +1.45 N·s to the ball. The ball then slides along the table and makes an elastic head-on collision with a second ball of equal mass ...
*October 24, 2010 by Xavier*

**physics**

A cue ball (mass = 0.140 kg) is at rest on a frictionless pool table. The ball is hit dead center by a pool stick which applies an impulse of +1.60 N·s to the ball. The ball then slides along the table and makes an elastic head-on collision with a second ball of equal mass ...
*December 7, 2011 by s*

**physics**

A cue ball (mass = 0.140 kg) is at rest on a frictionless pool table. The ball is hit dead center by a pool stick which applies an impulse of +1.60 N·s to the ball. The ball then slides along the table and makes an elastic head-on collision with a second ball of equal mass ...
*December 7, 2011 by Anonymous*

**math**

IF HOCKEYPUCK TOOK 0.8 SEC TO TRAVEL 89 FEET TO THE GOAL LINE,FIND THE AVERAGE SPEED OF THE PUCK IN FEET PER SECOND
*December 29, 2011 by SAHIL*

**physics**

Ann, a 59.2 kg person throws a 0.0435 kg snowball forward with a ground speed of 39.5 m/s. Billy, with a mass of 63.5 kg, catches the snowball. Both people are on skates. Ann is initially moving forward with a speed of 2.22 m/s, and Billy is initially at rest. After the ...
*October 21, 2012 by Anonymous*

**Physics**

In a demonstration in physics class, a 1.2 kg dynamics cart starts from rest at the top of a ramp. the ramp is 2.4 m above the ground. the cart then rolls down to the bottom of the ramp, where it collides with a stationary 1.4 kg dynamics cart. Assume that an elastic head-on ...
*November 18, 2013 by LENA*

**physics**

A cart of mass 340 g moving on a frictionless linear air track at an initial speed of 1.2 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision the first cart continues in its original direction at .66m/s. a) what is the mass...
*March 3, 2007 by Chris*

**Physics**

A 0.500 kg sphere moving with a velocity (2.00i - 3.50j + 1.00k) m/s strikes another sphere of mass 1.50 kg moving with a velocity (-1.00i + 2.00j - 2.80k) m/s. (a) If the velocity of the 0.500 kg sphere after the collision is (-1.00i + 3.00j - 8.00k) m/s, find the velocity of...
*December 1, 2011 by LadyJ*

**physics**

A neutron in a reactor makes an elastic head-on collision with a nitrogen atom that is initially at rest. (The mass of the nitrogen nucleus is about 14 times that of the neutron.) (a) What fraction of the neutron's kinetic energy is transferred to the nitrogen nucleus? (b) If ...
*October 28, 2012 by heather*

**PHYSICS**

Two cars collide at an intersection. Car A, with a mass of 2000kg, is going from west to east, while car B, of mass 1300kg, is going from north to south at 15.0m/s. As a result of this collision, the two cars become enmeshed and move as one afterwards. In your role as an ...
*March 30, 2012 by char*

**Physics**

A cue ball traveling at 4.0 m/s makes a glancing, elastic collision with a target ball of equal mass that is initially at rest. The cue ball is deflected so that it makes an angle of 30° with its original direction of travel. (a) Find the angle between the velocity vectors of ...
*November 7, 2010 by Amy*

**science**

A cue ball traveling at 4.0 m/s makes a glancing, elastic collision with a target ball of equal mass that is initially at rest. The cue ball is deflected so that it makes an angle of 30° with its original direction of travel. (a) Find the angle between the velocity vectors of ...
*November 7, 2010 by Amy*

**Physics HELP HELP**

A cue ball traveling at 4.0 m/s makes a glancing, elastic collision with a target ball of equal mass that is initially at rest. The cue ball is deflected so that it makes an angle of 30° with its original direction of travel. (a) Find the angle between the velocity vectors of ...
*November 8, 2010 by matt*

**Ice Hockey**

i know some things about ice hockey i know that it is canada's national game and is a significant addition to world sport. It is played seriously by men and women in 20 countries. it is a fast paced antipathetic sport in which 2 teams of six players compete to push a hard ...
*February 21, 2010 by Anonymous*

**Physics**

Two ice skaters, Daniel (mass 70.0kg ) and Rebecca (mass 45.0kg ), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at 14.0m/s before she collides with him. After the collision, Rebecca has a velocity of magnitude 6.00m/s...
*October 17, 2013 by Andrew*

**Physics**

A line of identical train cars collide inelastically. (They couple.) Three carts are initially coupled and moving at speed v: the rest are stationary. The three moving cars hit a fourth, then those four hit a fth, and so on. This continues until the speed of the "collection" ...
*November 1, 2012 by NIck*

**Physics**

Which of the following events does not involve a change in angular momentum? 1. A spinning ice skater drawing in her arms to increase her rotational speed. 2. A child walking along the perimeter of a merry-go-round as it rotates. 3. A child walking towards the center of a ...
*April 6, 2011 by Anonymous*

**Physics**

A 0.03-kg bullet is fired vertically at 200m/s into a 0.15-kg baseball that is initially at rest. The bullet lodges in the baseball and, after the collision, the baseball/bullet rise to a height of 37m. (a). What was the speed of the baseball/bullet right after the collision...
*February 14, 2013 by Annie*

**physics**

A 50.0 kg soccer player jumps vertically upwards and heads the 0.45 kg ball as it is descending vertically with a speed of 27.0 m/s. If the player was moving upward with a speed of 2.80 m/s just before impact. (a) What will be the speed of the ball immediately after the ...
*October 23, 2012 by Anonymous*

**physics**

A 50.0 kg soccer player jumps vertically upwards and heads the 0.45 kg ball as it is descending vertically with a speed of 27.0 m/s. If the player was moving upward with a speed of 2.80 m/s just before impact. (a) What will be the speed of the ball immediately after the ...
*October 23, 2012 by Anonymous*

**Physics**

Two blocks move along a linear path on a nearly frictionless air track. One block, of mass 0.120 kg, initially moves to the right at a speed of 4.90 m/s, while the second block, of mass 0.240 kg, is initially to the left of the first block and moving to the right at 7.40 m/s. ...
*October 18, 2012 by Pat*

**physics**

Two blocks move along a linear path on a nearly frictionless air track. One block, of mass 0.104 kg, initially moves to the right at a speed of 4.70 m/s, while the second block, of mass 0.208 kg, is initially to the left of the first block and moving to the right at 6.50 m/s. ...
*November 29, 2012 by Anthony*

**Physics**

Two blocks of masses m1 = 2.00 kg and m2 = 3.70 kg are each released from rest at a height of h = 5.60 m on a frictionless track, as shown in the figure below, and undergo an elastic head-on collision. (Let the positive direction point to the right. Indicate the direction with...
*October 29, 2012 by Jessica*

**Physics**

Two blocks of masses m1 = 2.00 kg and m2 = 3.70 kg are each released from rest at a height of h = 5.60 m on a frictionless track, as shown in the figure below, and undergo an elastic head-on collision. (Let the positive direction point to the right. Indicate the direction with...
*October 29, 2012 by Jessica*

**physics**

A 68 kg man is ice-skating due north with a velocity of 5.6 m/s when he collides with a 42 kg child. The man and child stay together and have a velocity of 3.0 m/s at an angle of 35° north of due east immediately after the collision. What are (a) the magnitude and (b) the ...
*November 13, 2013 by kristy*

**physics-HELPP**

A 50.0 kg soccer player jumps vertically upwards and heads the 0.45 kg ball as it is descending vertically with a speed of 27.0 m/s. If the player was moving upward with a speed of 2.80 m/s just before impact. (a) What will be the speed of the ball immediately after the ...
*October 23, 2012 by Anonymous*

**calculus**

A moving dot P departs from O at an initial speed of 6 m/s in the east direction and accelerates at 2 m/s^2 in the east direction. 2 seconds after P's departure, dot Q departs from O to chase down P at a constant speed of k m/s in the east direction. What is the minimum speed...
*March 21, 2013 by rohit*

**physics**

A stationary billiard ball, mass 0.17 kg, is struck by an identical ball moving at 4.8 m/s. After the collision, the second ball moves off at 60° to the left of its original direction. The stationary ball moves off at 30° to the right of the moving ball's original direction. ...
*January 24, 2013 by Anonymous*

**physics**

A block of ice at 0°C whose mass initially is m = 12.5 kg slides along a horizontal surface, starting at a speed vo = 4.10 m/s and finally coming to rest after traveling a distance d = 10.07 m. Compute the mass of ice melted as a result of the friction between the block and ...
*December 8, 2009 by AK*

**Physics - Momentum**

A ball of mass m makes a head-on elastic collision with a second ball (at rest) and rebounds with a speed equal to one-third its original speed. What is the mass of the second ball?
*December 10, 2009 by DJ*

**physics**

A(n) 3.91 kg sphere makes a perfectly inelastic collision with a second sphere that is initially at rest. The composite system moves with a speed equal to one-third the original speed of the 3.91 kg sphere. What is the mass of the second sphere? Answer in units of kg
*January 30, 2012 by david*

**Physics**

A ball of mass m makes a head-on elastic collision with a second ball (at rest) and rebounds with a speed equal to one-fourth its original speed. What is the mass of the second ball?
*December 10, 2009 by Eric*

**physics**

A car moves along an x axis through a distance of 900 m, starting at rest (at x = 0) and ending at rest (at x = 900 m). Through the first ¼ of that distance, its acceleration is +2.25 m/s2 . Through the rest of that distance, its acceleration is – 0.750 m/s2 . Find its maximum...
*May 11, 2014 by Anonymous*

**Physics**

Initially, mass one (2.10 kg) has a velocity of 5.90 m/s and mass two (2.80 kg) is at rest. After they collide, mass one emerges at an angle theta = 33.0 degrees. What is the speed of mass one after the collision if the collision is completely elastic? (Note, there are ...
*March 27, 2011 by Mary*

**Physics**

Initially, mass one (2.10 kg) has a velocity of 5.90 m/s and mass two (2.80 kg) is at rest. After they collide, mass one emerges at an angle theta = 33.0 degrees. What is the speed of mass one after the collision if the collision is completely elastic? (Note, there are ...
*March 27, 2011 by Mary*

**Physics**

Ice-hockey star Wayne Gretzky is skating at 12.7 m/s toward a defender, who in turn is skating at 5.39 m/s toward Gretzky. Gretzky’s weight is 677 N; that of the defender is 869 N. Immediately after the collision, Gretzky is moving at 2.21 m/s in his original direction. You ...
*March 13, 2008 by Charlie*

**college physics**

two billiard balls of equal mass undergo a perfectly elastic collision. if the speed of one ball was initially 5.72 m/s and the other 1.64 m/s. what will their speeds be after the collision
*October 16, 2014 by Anonymous*