9th Edition

ISBN: 8220100454899

Author: Jewett

Publisher: Cengage Learning US

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Chapter 4, Problem 4.23P

A placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal. Hall the crowd hopes he 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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Chapter 4, Problem 4.22P

Chapter 4, Problem 4.24P

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3.63 • Leaping the River II. A physics professor did daredevil stunts in his spare time. His last stunt was an attempt to jump across a river on a motorcycle (Fig. P3.63). The takeoff ramp was inclined at 53.0°, the river was 40.0 m wide, and the far bank was 15.0 m lower than the top of the ramp. The river itself was 100 m below the ramp. Ignore air resistance. (a) What should his speed have been at the top of the ramp to have just made it to the edge of the far bank? (b) If his speed was only half the value found in part (a), where did he land? Figure P3.63 53.0° 100 m 40.0 m→ 15.0 m

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Chapter 4 Solutions

EBK PHYSICS FOR SCIENTISTS AND ENGINEER

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Solution Summary: The author explains the distance by which the ball clears the cross bar and the angle made by the football with the horizontal is 53.0°.

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