2) Momentum and Newton's Second Law: Impulse
(a) A block of wood is struck by a bullet. Is the block morelikely to be knocked over if the bullet embeds itself in the woodor bounces back? Explain why. [Hint: in which case is the change inmomentum of the bullet (and hence the force applied by the bullet)larger?]
(b) A sudden gust of wind exerts a force of 20.0 N for 1.20 s ona bird that had been flying at 5.00 m/s. As a result, the bird endsup moving in the opposite direction at 7.00 m/s. What is the massof the bird?
(c) A 144-g baseball is moving toward home plate with a speed of97mph when it is bunted (hit softly). The bat exerts an averageforce of 6.50 ×103 N on the ball for 1.30 ms (millisecond). Theaverage force is directed toward the pitcher, which we take to bethe positive x direction. What is the final speed of the ball?
