Bouncing Ball - 9.40
December-22-12
5:13 PM
A 200g ball is dropped from a height of 2.0m and bounces on
a hard floor. The force on the ball from the floor is shown
below. How high does the ball rebound?
Chapter 9 Page 1
Inelastic collision 9.28
December-23-12
12:11 PM
A 20g ball of clay traveling east at 2.0 m/s collides with a 30 g
ball of clay traveling 30 o south of west at 1.0 m/s. What are
the speed and the direction of the resulting 50 g blob of clay?
Chapter 9 Page 2
Bullet thru block 9.59
December-27-12
4:20 PM
A 10 g bullet is fired into a10 kg wood block that is at
rest on a wood table. The block, with the bullet
embedded, slides 5.0 cm across the table. What was
the speed of the bullet?
Chapter 9 Page 3
Rocket 9.61
January-01-13
11:58 AM
A 1500 kg weather rocket accelerates upward at 10.0 m/s 2.
It explodes 2.00 s after liftoff and breaks into two fragments,
one twice as massive as the other. Photos reveal that the
lighter fragment traveled straight up and reached a
maximum height of 530 m. What were the speed and
direction of the heavier fragment just after the explosion?
Chapter 9 Page 4
Merry go round 9.74
January-01-13
3:35 PM
A 3.0 m diameter merry-go-round with a mass of 250kg
is spinning at 20rpm. John runs around the merry-goround at 5.0m/s, in the same direction that it is turning,
and jumps onto the outer edge. John's mass is 30kg.
What is the merry-go-round's angular speed, in rpm,
after John jumps on?
Chapter 9 Page 5