TESC – winter 2003 Week 4

Please answer all of the following questions, and submit them no later than Monday, February 3^rd.
 
 

Which shot would a hockey goalie have a better chance of blocking – a shot from 5 m away at 10m/s or a shot from 10 m away at 40m/s? Explain why.

The horizontal velocity of a baseball pitcher’s fastball is 40 m/s at the instant it’s released from the pitcher’s hand. If the horizontal distance from the pitcher’s hand to homeplate is 17.5 m at the instant of release, how much time does the batter have to react to the pitch and swing the bat?

Please include an equation to show how you worked your solution.

Sammy is running a 200-m race. When the starter’s pistol fires, he leaves the starting block and continues speeding up until he reaches top speed of 13 m/s 9 seconds into the race. He holds this for 7 seconds and then gradually slows down until he crosses the finish line 24 seconds after he started the race.

1. What was Sammy’s average acceleration during the first 9 seconds of the race?
2. What was Sammy’s average acceleration from 9 – 16 seconds into the race?
3. In which direction was Sammy’s acceleration during the last 8 seconds of the race?

Why does a heavy parachutist fall faster than a lighter parachutist who wears the same size parachute?

Why is a punch more forceful with a bare fist than with a boxing glove?