Suppose you swing a ball of mass m in a vertical circle on a string of length L. As you probably know from experience, there is a minimum angular welocity wmin you must maintain if you want the ball to complete the full circle without the string going slack at the top. ▼ Part A Find an expression for wmin in terms of g and L. Express your answer in terms of the variable L and the free-fall acceleration g. Wmin= Submit √E Part B Previous Answers Correct Evaluate wmin in rpm for a 65 g ball tied to a 1.8-m-long string. Express your answer in revolutions per minute.

Suppose you swing a ball of mass m in a vertical circle on a string of length L. As you probably know from experience, there is a minimum angular welocity wmin you must maintain if you want the ball to complete the full circle without the string going slack at the top. ▼ Part A Find an expression for wmin in terms of g and L. Express your answer in terms of the variable L and the free-fall acceleration g. Wmin= Submit √E Part B Previous Answers Correct Evaluate wmin in rpm for a 65 g ball tied to a 1.8-m-long string. Express your answer in revolutions per minute.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter6: Uniform Circular Motion And Gravitation

Section: Chapter Questions

Problem 16PE: Olympic ice skaters are able to spin at about 5 rev/s. (a) What is their angular velocity in radians...

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Olympic ice skaters are able to spin at about 5 rev/s. (a) What is their angular velocity in radians per second? (b) What is the centripetal acceleration of the skater's nose if it is 0.120 m from the axis of rotation? (c) An exceptional skater named Dick Button was able to spin much faster in the 1950s than anyone since—at about 9 rev/s. What was the centripetal acceleration of the tip of his nose, assuming it is at 0.120 m radius? (d) Comment on the magnitudes of the accelerations found. It is reputed that Button ruptured small blood vessels during his spins.
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