Question 4 b)

If

the ball accelerates uniformly when it hits the floor, calculate its

acceleration as it comes to rest before rebounding. Give your answer to the

nearest whole number in units of m/s

Question 4 a)

As

a tennis ball bounces on a hard surface, it undergoes deformation, compressing

and then rebounding. A tennis ball of mass 57.0 g is dropped from a height of

2.4 m onto a concrete surface and rebounds to a height of 1.35 m. During

impact, the ball compresses by approximately 5 mm. Ignore the effects of air

resistance.

How

fast is the ball moving when it hits the concrete surface?

Question 3 c)

The

batters’ muscles must provide the energy taken to swing the bat from rest. If

we model the batter’s swing as having an average speed of 18 m/s over a swing time

period of 200 ms, what is the power output required by the batters’ muscles to

achieve this swing? (Assume 100% of the energy from her muscles is transferred

to the bat.)

Question 3 b)

If

the softball and bat are in contact for 10 ms, what is the average force that

the bat exerts on the ball?

Question 3 a)

A

fastpitch softball player swings her 600 g bat with a speed of 25 m/s at the

time of impact with the ball. She hits a 170 g softball that was approaching

her at a speed of 30 m/s. The ball rebounds at 41 m/s.

How

fast is her bat moving immediately after the impact? (Ignore the interaction

with her hand for the duration of the collision.)

Question 2 d)

Question 2 c)

Question 2 b)

The

sweepers in a curling competition adjust the

Question 2 a)

Question 1 d)

The

change in the ball’s position from