College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Chapter 3, Problem 11P
A placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal. Half the crowd hopes the ball will clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 20.0 m/s at an angle of 53.0° to the horizontal, (a) By how much does the ball clear or fall short of clearing the crossbar? (b) Does the ball approach the crossbar while still rising or while falling?
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A placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal. Half the crowd hopes the ball will clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 23.8 m/s at an angle of 52.0° to the horizontal. By how much does the ball clear or fall short of clearing the crossbar? (Enter a negative answer if it falls short.)
A placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal. Half the crowd hopes the ball will clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 23.2 m/s at an angle of 47.0° to the horizontal.
By how much does the ball clear or fall short of clearing the crossbar? (Enter a negative answer if it falls short.
Does the ball approach the crossbar while still rising or while falling?
A placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal. Half the crowd hopes the ball will clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 23.7 m/s at an angle of 52.5° to the
horizontal.
(a) By how much does the ball clear or fall short of clearing the crossbar?
(b) Does the ball approach the crossbar while still rising or while falling?
Part 1 of 6 - Conceptualize
We might guess that a ball kicked at such a high angle might fall short of the crossbar and that an angle closer to 45° would be preferable for scoring a goal. If the football does clear the crossbar, it will probably be on the way down from its flight.
Part 2 of 6 - Categorize
The football is a projectile moving with constant horizontal velocity and constant vertical acceleration. We will find the height of the ball when its horizontal displacement component is 36.0 m, and compare this height to 3.05 m. Then we will find the time
interval for…
Chapter 3 Solutions
College Physics
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