Examples Solutions
A. What is the
magnitude of the momentum of a 28-g sparrow flying with a speed of
B. A constant friction force of 25 N
acts on a 65-kg skier for 20 s. What is the skier’s change in velocity?
C. A 0.145-kg baseball pitched at 39.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s.
If the
contact time between bat and ball is 3.00 x 10-3 s,
calculate the average force between the ball and bat during contact.
D. Calculate the force exerted on a rocket, given that the propelling gases are expelled at a rate of 1500 kg/s with a speed of 4.0 x 104
m/s (at the moment of
takeoff).