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March 31, 2015

March 31, 2015

Posted by **Nick** on Thursday, April 11, 2013 at 12:01pm.

your derivation. No credit will be awarded for a final answer without a derivation.

As usual, simplify your final answers as much as possible.

A giant Pez dispenser of mass m rests on a ladder of mass M and length L. The

ladder is propped at an angle to the horizontal. The coefficient of static friction

between the ground and the ladder is S and the wall against which the ladder is

resting is frictionless. The Pez is a distance d up from the bottom of the ladder.

A) Draw an extended free-body diagram, showing all the forces acting on the

ladder and where they are acting.

B) What is the maximum mass m of Pez for which the ladder will not slip?

C) At a certain angle your expression for m becomes infinite. What is that

angle?

D) At another angle your expression for m becomes less than zero (negative).

Over what range of angles is the value of m negative?

E) What is the physical significance of these peculiar values of m?

- physics -
**Nick**, Thursday, April 11, 2013 at 12:31pmIf your browser can't load certain text, the box after angle is theta, and the coefficient of static friction is u sub s

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