Homework Help: Physics

Posted by Natasha on Wednesday, April 18, 2012 at 1:49pm.

A 9.67-m ladder with a mass of 25.0 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 242 N. At the instant the top of the ladder leaves the ground, the ladder experiences an angular acceleration of 1.94 rad/s2 about an axis passing through the bottom end of the ladder. The ladder's center of gravity lies halfway between the top and bottom ends.
A.What is the net torque acting on the ladder?
B.What is the ladder's moment of inertia?

Physics - Elena, Wednesday, April 18, 2012 at 6:02pm
M =M1 –M2 = F1•L -mg•(L/2)=
242•9.67 - 25•9.8•(9.67/2) = 1155 N•m,
M = I•ε
I =M/ ε = 1155/1.94 = 595.6 kg•m^2

Answer this Question

Related Questions

Physics - A 8.49-m ladder with a mass of 24.2 kg lies flat on the ground. A ...
physics - A painter climbs a ladder leaning against a smooth wall. At a certain ...
Physics- PLEASE HELP - A painter climbs a ladder leaning against a smooth wall. ...
physcis - A painter climbs a ladder leaning against a smooth wall. At a certain ...
physics - A painter climbs a ladder leaning against a smooth wall. At a certain ...
Physics- PLEASE HELP - A painter climbs a ladder leaning against a smooth wall...
Math - A painter leans a ladder against a vertical wall. The top of the ladder ...
math - A painter leans a ladder against a vertical wall. The top of the ladder ...
math - A painter leans a ladder against a vertical wall. The top of the ladder ...
Physics - Romeo takes a uniform 15.0-m ladder and leans it against the smooth (...

For Further Reading

First Name:
School Subject:
Answer: