Homework Help: physics

Posted by PHYSICS HELP!!!! on Monday, November 7, 2011 at 9:29pm.

A uniform 7.1 m tall aluminum ladder is leaning against a frictionless vertical wall. The ladder has a weight of 272 N. The ladder slips when it makes a 57.0degrees angle with the horizontal floor.
Determine the coefficient of static friction between the ladder and the floor.

physics - drwls, Monday, November 7, 2011 at 11:08pm
The frictional torque is barely able to keep it from slipping at 57 degrees from horizontal. Set the net torque about the point of contact with the vertical wall equal to zero.

Wladder*(L/2)*cos57 = Wladder*mus*Lsin57

0.5 cot57 = mus = 0.325

"mus" is the static friction coefficient

Answer this Question

Related Questions

physics101 - A uniform 7.1 m tall aluminum ladder is leaning against a ...
physics - A uniform ladder 10.0 m long is leaning against a frictionless wall at...
physics - A uniform ladder 10.0 m long is leaning against a frictionless wall at...
Math - If a wall is 6th tall and a ladder is leaning against it. The ladder is ...
physics - A 16.0-m uniform ladder weighing 490 N rests against a frictionless ...
Physics - A uniform ladder of length L and mass m leans against a frictionless ...
Physics - A ladder, mass 40 kg, 5 m long, is leaning against a vertical ...
physics - Bill the firefighter stands on an 8 meter ladder of weight 355 Newtons...
physics - A ladder of length 5m has mass of 25 Kg. the ladder is leaned against ...
physics - A ladder of length 5m has mass of 25 Kg. the ladder is leaned against ...

For Further Reading

First Name:
School Subject:
Answer: