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Unformatted text preview: 1 of 4 [ Print View ] Class PH1110A2007 Assignment 13 Due at 5:00pm on Monday, October 1, 2007 View Grading Details A Person Standing on a Leaning Ladder A uniform ladder with mass and length rests against a smooth wall. A do-it-yourself enthusiast of mass stands on the ladder a distance from the bottom (measured along the ladder). The ladder makes an angle with the ground. There is no friction between the wall and the ladder, but there is a frictional force of magnitude between the floor and the ladder. is the magnitude of the normal force exerted by the wall on the ladder, and is the magnitude of the normal force exerted by the ground on the ladder. Throughout the problem, consider counterclockwise torques to be positive. None of your answers should involve (i.e., simplify your trig functions). Part A What is the minimum coeffecient of static friction required between the ladder and the ground so that the ladder does not slip? Hint A.1 Method for finding Hint not displayed Part A.2 Expression for Part not displayed Hint A.3 Choice of origin of torque Hint not displayed Part A.4 Sum the torques Part not displayed Hint A.5 Putting it all together Hint not displayed Express in terms of , , , , and ....
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This note was uploaded on 04/29/2008 for the course PH 1110 taught by Professor Kiel during the Fall '08 term at WPI.
- Fall '08