Portable Friction
Statics - Ladder problem.?
Can anyone answer the following problem?
A straight portable ladder of length, L, is needed to climb onto a rooftop 14 ft high. Assume: 1. the ladder weights 40 lbs and the person climbing on it weights 180 pounds; 2. the center of gravity acts 3 ft vertically from the point of contact on the ladder rungs; 3. the coefficient of friction between the ladder feet and surface it rests is 0.4
(a) How long should the ladder be?
(b) How far up the ladder can the worker go before it slides out at the bottom?
(c) If the worker stands on the ladder 2 ft from the rooftop, how much force is required to tip the ladder away from the rooftop, assuming the force acts horizontally against the top of the ladder? Neglect vertical forces at the rooftop.
Did you make up this question or is it actually a question?? Very hard to answer. I will look back so that i see who answers. In the mean time, i will pick up these two points. (not like i need them)
 
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