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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
An 8 ft long ladder has seven rungs. The rungs are spaced 1 ft apart, and the top and bottom rungs are 1 ft from their respective ends of the ladder. The top of the ladder has a roller. Neglect the weight of the ladder and assume the worker’s hand applies no force to the ladder.
(a) If the worker weighs 140 lb and stands on the middle rung, determine the minimum value of the coefficient of friction so that the ladder does not slide.
(b) If the worker weighs 140 lb and stands on a different rung, does your answer to Part (a) change? Explain.
(c) If the worker weighs more than 140 lb and stands on the middle rung, does your answer to Part (a) change? Explain.

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