College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Chapter 3, Problem 43AP
A home run is hit in such a way that the baseball just clears a wall 21 m high, located 130 m from home plate. The ball is hit at an angle of 35° to the horizontal, and air resistance is negligible. Find (a) the initial speed of the ball, (b) the time it takes the ball to reach the wall, and (c) the velocity components and the speed of the ball when it reaches the wall. (Assume the ball is hit at a height of 1.0 m above the ground.)
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A home run is hit in such a way that the baseball just clears a wall 20 m high, located 124 m from home plate. The ball is hit at an angle of 33° to the horizontal, and air resistance is negligible.
(Assume that the ball is hit at a height of 1.0 m above the ground.)
(a) Find the initial speed of the ball.
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(b) Find the time it takes the ball to reach the wall.
(c) Find the velocity components of the ball when it reaches the wall.
x-component
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y-component
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An outfielder throws a baseball to his catcher in an attempt to throw out a runner at home plate. The ball bounces once before reaching the catcher. Assume the angle at which the bounced ball leaves the ground is the same as the angle at which the outfielder threw it as shown, but that the ball’s speed after the bounce is one-half of what it was before the bounce. (a) Assume the ball is always thrown with the same initial speed and ignore air resistance. At what angle θ should the fielder throw the ball to make it gothe same distance D with one bounce (blue path) as a ball thrown upward at 45.0° with no bounce (green path)? (b) Determine the ratio of the time interval for the one-bounce throw to the flight time for the no-bounce throw.
A boy wishes to throw a ball over a flat roofed school house that stands 12 m wide and 7.5 m high on level ground. Assuming that the ball will leave his hand at a height of 5 m above the ground,determine how far from the wall he should take his hand in order to make the ball clear the roof with least effort, that is, with minimum velocity.
Chapter 3 Solutions
College Physics
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