BIO Human Biomechanics. The fastest pitched baseball was measured at 46 m/s. A typical baseball has a mass of 145 g. If the pitcher exerted his force (assumed to be horizontal and constant) over a distance of 1.0 m, (a) what force did he produce on the ball during this record-setting pitch? (b) Draw free-body diagrams of the ball during the pitch and just after it left the pitcher’s hand.
BIO Human Biomechanics. The fastest pitched baseball was measured at 46 m/s. A typical baseball has a mass of 145 g. If the pitcher exerted his force (assumed to be horizontal and constant) over a distance of 1.0 m, (a) what force did he produce on the ball during this record-setting pitch? (b) Draw free-body diagrams of the ball during the pitch and just after it left the pitcher’s hand.
BIO Human Biomechanics. The fastest pitched baseball was measured at 46 m/s. A typical baseball has a mass of 145 g. If the pitcher exerted his force (assumed to be horizontal and constant) over a distance of 1.0 m, (a) what force did he produce on the ball during this record-setting pitch? (b) Draw free-body diagrams of the ball during the pitch and just after it left the pitcher’s hand.
A man ( mass = 100 kg) fall freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of .2s. The average force exerted on her by the ground is + 2000 N, where the upward direction is taken to be the positive direction.
A) from what height did he just fall? Assume the only force acting on him during the collision is that of the ground.
B) suppose instead of the man, a 5 kg rubber ball was dropped from the same vertical distance and the ball bounced back conserving the linear momentum. What would be the velocity of the ball just when it bounced back?
A 1370 kg jeep traveling at 19 m/s can be stopped in 24.0 s by gently applying the brakes. a) What is the average force exerted on the jeep in this case? b) If the driver slams on the brakes, the jeep stops in 2.10 s. What is the average force exerted on the jeep in this case? c) How much time will it take it stop if the driver coasts and lets a 300 N friction force stop the car?
4.42 • BIO Human Biomechanics.
ball, served by "Big Bill" Tilden in 1931, was measured at
73.14 m/s. The mass of a tennis ball is 57 g, and the ball is typi-
cally in contact with the tennis racquet for 30.0 ms, with the ball
starting from rest. Assuming constant acceleration, (a) what force
did Big Bill's tennis racquet exert on the tennis ball if he hit it
essentially horizontally? (b) Draw free-body diagrams of the tennis
ball during the serve and just after it moved free of the racquet.
The fastest served tennis
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