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# ps7a17 - Physics 111.01 PS 7a(17 Problem 1 = Walker P 9-09...

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Physics 111.01 October 13, 2008 PS 7a (17) Problem 1 = Walker P. 9-09. In a typical golf swing, the club is in contact with the ball for about 0.0010 s. If the 45 g ball acquires a speed of 70 m/s, estimate the magnitude of the force exerted by the club on the ball. kN m v Solution. The momentum imparted to the golf ball is () ( ) kg 70 m/s 3.15 kg m/s = 0.045 pm v == The average force is equal to the rate of transfer of momentum. In this case the change in momentum p is equal to the momentum of the ball after being struck: ( ) average 3.15 kg m/s 3150 N 0.001 s p F t = Problem 2 = Walker P. 9-17. Two ice skaters stand at rest in the center of an ice rink. When they push off against one another the 45 kg skater acquires a speed of 0.74 m/s. If the speed of the other skater is 0.81 m/s, what is this skater's mass? kg m 1 v 2 v 1 Solution. The idea here is simple: The momenta of the two skaters must be equal and opposite. This gives 11 2 2 mv = Solving for m 2 (the "other skater") we get ( ) 2 45 kg 0.74 m/s 41.1 kg m = = 2 0.81 m/s v Problem 3.

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ps7a17 - Physics 111.01 PS 7a(17 Problem 1 = Walker P 9-09...

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