7423

Physics Work,Power & Energy Level: Misc Level

A 0.246 kg puck, initially at rest on a horizon-tal, frictionless surface, is struck by a 0.169 kg puck moving initially along the x axis with a speed of 2.2 m/s.After the collision, the 0.169 kg puck has a speed of 1.2 m/s at an angle of 38 degrees to the positive x axis. Determine the velocity of the 0.246 kg puck after the collision. Answer in units of m/s.


7422

Physics Work,Power & Energy Level: Misc Level

A 2123 kg car moving east at 10.64 m/s col-lides with a 3204 kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 38.1 degrees north of east and at a speed of 5.39 m/s.What was the speed of the 3204 kg  car before the collision? Answer in units of m/s.


7421

Physics Work,Power & Energy Level: Misc Level

Two particles, of masses m and 4 m, are mov-ing toward each other along the xi axis with the same initial speeds of 7. 76 m/s. Mass m is traveling to the left, and mass 4 m is trav- eling to the right. They undergo a head-on elastic collision, and each rebounds along the same line as it approached. Find the final speed of the hevier particle.Answer in units of m/


7385

Physics Work,Power & Energy Level: Misc Level

A. 0.025 kg bullet is fired straight up at a falling wooden block that has a mass of 3.0 kg. The bullet has a speed of 740 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision with the bullet occured. As a result of the collision, the block (with the bullet in it) reverses direction, rises, and comes to a momentary halt at the top of the building. Find the time t.


7383

Physics Work,Power & Energy Level: Misc Level

Consider the two moving boxcars in Example 5.Car1 has a mass of m1=65 x103 kg and moves at a velocity of v01=+0.85 m/s. Car 2, with a mass of m2=92 x103 kg and a velocity of v02=+1.4 m/s, overtakes car 1 and couples to it.Neglect the effects of friction in your answer.

a) Determine the velocity of their center of mass before the collision

b)Determine the velocity of their center of mass after the collision

c) Should your answer in part (b) be less than, greater than , or equal to the common velocity vf of the two coupled cars after the collion?Explain.


7382

Physics Work,Power & Energy Level: Misc Level

The drawing shows a collison between two pucks on an air-hockey table.Puck A has a mass of 0.032 kg and is moving along the x axis with a velocity of +5.5 m/s.It makes a collision with puck B, which has a mass of 0.052 kg and is initially at rest. The collision is not head-on.After the collision, the two pucks fly apart with the angles shown in the drawing.

a) Find the final speed of puck A.

b) Find the final speed of puck B.


7381

Physics Work,Power & Energy Level: Misc Level

A 2.50 g bullet, traveling at a speed of 420 m/s, strikes the wooden block of a ballistic pendulum, as shown. The block has a mass of 265 g.

a) Find the speed of the bullet/block combination immediately after the collision.

b) How high does the combination rise above its initial position?


7380

Physics Work,Power & Energy Level: Misc Level

The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig. As she fires a gun, she is driven back over the edge and into the sea. Suppose the mass of a bullet is 0.009 kg, and its velocity is +712 m/s. Her mass (including the gun) is 45 kg.

a) What recoil velocity does she acquire in response to a single shot from a stationary position, assuming that no external force keeps her in place?

b) Under the same assumption,what would be her recoil velocity if, instead, she shoots a blank cartridge that ejects a mass of 5.0x 10-4 kg at a velocity of +712 m/s?


7379

Physics Work,Power & Energy Level: Misc Level

A 55 kg swimmer is standing on a stationary 230 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +5.2 m/s relative to the shore.Find the recoil velocity that the raft would have if there were no friction and resistance due to the water.


7354

Physics Work,Power & Energy Level: Misc Level

A 40 kg mass rests on one end of a teeter-totter. A 300 kg mass is dropped from a height of 10 meters and strikes the other end of the teeter-totter. If 40% of the larger block,s energy is transferred via the teeter-totter to the small mass, what is the height to which the small mass rises?


7353

Physics Work,Power & Energy Level: Misc Level

How high is a waterfall if 300 kg of water acquires a kinetic energy of 400,000 joules by falling from the top of the waterfall to the ground?


7350

Physics Work,Power & Energy Level: Misc Level

An automobile weighing 2800 Ibs. is traveling 55MPH. What is the kinetic energy and what would be the speed of the atomobile if the kinetic energy were doubled?


7348

Physics Work,Power & Energy Level: Misc Level

A 3.0-kg cart moving to the right with a speed of 1.0 m/s has a head on collision with a 5.0-kg  cart that is initially moving to the left with a speed of 2 m/s.After the collision, 3.0-kg cart is moving to the with a speed of 1 m/s. What is the final velocitty of the 5.0-kg cart?


7347

Physics Work,Power & Energy Level: Misc Level

Two objects of equal mass traveling toward each other with equal speeds undergo a head on collision. wich one of the following statements is necessarily true? They will exchange velocities Their velocities will be reduced Their velocities will be unchanged Their velocities will be zero Their velocities may be zero


7346

Physics Work,Power & Energy Level: Misc Level

Two objects of equal mass traveling toward each other with equal speeds undergo a head on collision. wich one of the following statements is necessarily true? They will exchange velocities Their velocities will be reduced Their velocities will be unchanged Their velocities will be zero Their velocities may be zero


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