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Unformatted text preview: MAE 101: Statics and Strength of Materials Fall 2011 Due Wednesday, Nov 9 th , 2011 Problem 37. (Problem 8.28 from Bedford et al) The coefficient of static friction between the ladder and the floor is μ s = 0 . 6 , and α = 35 ◦ . The center of mass of the 4m ladder is at its midpoint, and its mass is 18 kg. (a) If a football player with a mass of 140 kg attempts to climb the ladder, what maximum value of x will he reach? Neglect friction between the ladder and the wall. (b) What minimum friction coefficient would be required for him to reach the top of the ladder? x α Answer (a) x = 2 . 07 m, (b) μ s = 0 . 66 Problem 38. (Problem 8.74 from Bedford et al). The car jack is operated by turning the threaded shaft at A . The threaded shaft fits into a mating groove in the collar at B , causing the collar to move relative to the shaft as the shaft turns. As a result, points B and D move closer together or farther apart, causing point C (where the jack is in contact with the car) to move up or down. The pitch of the threaded shaft is(where the jack is in contact with the car) to move up or down....
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 Spring '08
 ORIENT
 Statics, Force, Mass, Bedford

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