A fireman of mass m slides a distance d down a pole. He starts from rest. He moves as fast at the bottom as if he had stepped off a platform a distance h≤dh \leq dh≤dabove the ground and descended with negligible air resistance. (a) What average friction force did the fireman exert on the pole? Does your answer make sense in the special cases of h = d and h = 0. (b) Find a numerical value for the average friction force a 75-kg fireman exerts, for d = 2.5 m and h = 1.0 m. (c) In terms of g, h, and d, what is the speed of the fireman when he is a distance y above the bottom of the pole?

A fireman of mass m slides a distance d down a pole. He starts from rest. He moves as fast at the bottom as if he had stepped off a platform a distance h≤dh \leq dh≤dabove the ground and descended with negligible air resistance. (a) What average friction force did the fireman exert on the pole? Does your answer make sense in the special cases of h = d and h = 0. (b) Find a numerical value for the average friction force a 75-kg fireman exerts, for d = 2.5 m and h = 1.0 m. (c) In terms of g, h, and d, what is the speed of the fireman when he is a distance y above the bottom of the pole?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter5: Displacement And Force In Two Dimensions

Section: Chapter Questions

Problem 8STP

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