Answered: A ladder of weight W stands on a rough…

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter6: Momentum And Collisions

Section: Chapter Questions

Problem 3WUE: Math Review (a) Solve the equation 7.20 103 m/s = (4.20 103 m/s) ln (Mi/Mf) for the fraction...

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A ladder of weight W stands on a rough floor and rests against a frictionless wall, illustrated above. It is only stable if the angle between the ladder and the ground is greater than theta (theta > 60 degree).

a. Find the coefficient of static friction between the floor and the ladder.

b. A child of weight 4W places the ladder against the wall at angle 70 degree(theta = 70 degree). Calculate how far up the ladder it is safe for the child to climb.

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If the child climbs too high, then the ladder will slide along the ground.

c. In this situation, is work done by the friction force?

d. Is work done by any force acting when a ball rolls along a horizontal surface?

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