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QUIZ: to turn in

A proton (mass 1 amu) is shot at a speed of 5.0 x10 7 m/s toward a gold target. The nucleus of a gold atom (mass 197 amu) repels the proton and deflects it straight back toward the source with 90% of its initial speed. What is the recoil speed of the gold nucleus?. QUIZ: to turn in

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QUIZ: to turn in

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  1. A proton (mass 1 amu) is shot at a speed of 5.0 x10 7 m/s toward a gold target. The nucleus of a gold atom (mass 197 amu) repels the proton and deflects it straight back toward the source with 90% of its initial speed. What is the recoil speed of the gold nucleus?

  2. QUIZ: to turn in Analyze the motion TennisBallBounce.mov using Logger Pro. Note that this video was filmed at 1200 frames/sec and is played back at 12 frames/sec. This means that each frame is 1/1200th of a second and any velocities will actually be 100x what you measure. Also, because the video is so short you can assume there is very little change in velocity due to gravity. 1. Draw vectors to represent the initial and final momenta and the impulse on the ball. 2. What is the ball’s velocity just before it hits the ground? What is it just after the ball bounces? 3. Is the ball’s momentum conserved? 4. The tennis ball has a mass of 67 grams. What is the impulse from the ground? 5. Assuming the force pulse has the shape shown here, what is the average force the ground exerts on the ball during the impact?

  3. A 30.0 g ball of clay traveling east at 5.50 m/s collides and sticks together with a 60.0 g ball of clay traveling north at 5.50 m/s. What are the speed and direction of the resulting ball of clay?

  4. You pick up a 1.3 kg textbook and raise it up from the desk to over your head (0.9 meters) at a constant speed. How much work does gravity do on the book? How much work does your hand do on the book? Does this agree with the work-kinetic energy principle?

  5. You pick up a 1.3 kg textbook and walk up a 5o inclined, 10 meter long wheelchair ramp at a constant speed. How much work do you do on the book in this case?

  6. Is mechanical energy conserved? If so, for what system? A basketball player slows during a jump.

  7. Is mechanical energy conserved? If so, for what system? A chalk-tipped dart is shot from a spring-loaded gun.

  8. Is mechanical energy conserved? If so, for what system? Two vehicles collide and stick together.

  9. Is mechanical energy conserved? If so, for what system? A bullet hits and is embedded in a pendulum. The pendulum swings up.

  10. Is mechanical energy conserved? If so, for what system? Two billiard balls collide and bounce apart.

  11. Is mechanical energy conserved? If so, for what system? The New Horizons space probe is sling shot around Jupiter to increase its speed.

  12. A cannon tilted up at 30o fires a cannon ball at 80 m/s from atop a 10-m high fortress wall. What’s the ball’s impact speed?

  13. A proton going 2.0x107 m/s collides head-on with a carbon atom at rest in a perfectly elastic collision. What are the speeds and directions of each afterwards?

  14. hi=37 cm diameter=21 cm QUIZ (turn this in) A 25 g ball bearing goes around a loop. If the ball bearing is released from rest and there is negligible friction with the track, 1. What is the ball’s speed at the bottom of the track? 2. What is its speed at the top of the loop? 3. In reality there’s friction. The ball is measured to have v=1.8 m/s when it leaves the loop. How much energy is converted to thermal energy? 4. If it takes 0.9 sec from release to exit, what is the average power dissipated as heat by the track and ball?

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