Exam 2 Review

Published on January 2017 | Categories: Documents | Downloads: 85 | Comments: 0 | Views: 818
of 2
Download PDF   Embed   Report

Comments

Content

Phys 135 Exam #2 Review
1. You fire a ball with speed 25 m/s as shown.

20o
20 m
a) How long is the ball in the air before it hits the wall?
b) At what height does it hit?
c) What is its speed when it hits the wall?
2. A 1kg ball rolls off a table that is 1 m high (assume an initial velocity of zero)
a) What is the change in kinetic energy of the ball between the moment it rolls off and the
moment it strikes the floor?
b) How much work is done by gravity on the ball?
c) If the ball undergoes a completely inelastic collision with the floor, stopping in a time
of 0.05 s, what impulse is provides to the ball?
d) What is the average force exerted by the floor on the ball?
3. A Ferris wheel has a 15 m radius and rotates 5 turns every minute.
a) What is the acceleration of a passenger at the highest point?
b) What about the lowest point?
4. A girl whirls a stone in a horizontal circle 2 m above the ground by means of a string
1.5 m long. The string breaks and the stone flies off horizontally, striking the ground 10
m away. What was the centripetal acceleration of the stone while it was in circular
motion?
5. You slide a 1 kg block up an incline at a constant speed:

45o
a) How much work is done by gravity in moving the block 1 m along the slope?
b) How much work is done by friction in moving the block 1 m along the slope? µk=0.2
between the block and surface.
c) How much work is done by you in moving the block 1 m along the slope?
d) If you take 5 minutes to do the work what is your power output?

6. A marksman holds a gun of mass 3kg lightly in his hands. He fires a bullet of mass 5g
horizontally with a velocity of 300m/s relative to the ground. What is the recoil velocity
of the gun? What are the final momentum and kinetic energy of the bullet and rifle?
7. Two cars collide as shown below. After the impact they have stuck together and move
off as a unit. Find the final momentum of the wreckage after the collision.
10 m/s

2000 kg
12 m/s
1000 kg
8. Two gliders move in 1 dimension along a track and undergo an elastic collision. What
are the velocities of the two gliders after the collision?
2 m/s

0.3 kg

2 m/s

0.1 kg

9. An object moves in SHM with a period of 0.5 s. The object’s max acceleration is 6.4
m/s2. What is its max velocity?

Sponsor Documents

Or use your account on DocShare.tips

Hide

Forgot your password?

Or register your new account on DocShare.tips

Hide

Lost your password? Please enter your email address. You will receive a link to create a new password.

Back to log-in

Close