Answer to Question #285477 in Physics for Kaidi

Question

1. A golf ball of mass 0.04kg hit off the tree at a speed of 40.5 m/s. The golf club was in contact with the ball for 0.003s. Find the average force exerted on the ball by the golf club.
2. A golf ball of mass 0.08kg hit off the tree at a speed of 38m/s. The golf club was in contact with the ball for 0.003s. Find the impulse imparted to the golf ball.
3. A flywheel is initially rotating at 5.9 rad/s and has a constant angular acceleration. After 3s it has rotated through 30 rad. The magnitude of its angular acceleration in rad/s² is:

Answer 1

1. $F=mv/t=540\text{ N}.$

2. $I=mv=3.04\text{ kg m/s}.$

3. $30=5.9·3+\alpha·3^2/2→\alpha=2.73\text{ rad/s}^2.$