Homework Help: physics

Posted by anonymous on Thursday, February 1, 2007 at 2:37am.

If a pulley is 57% efficient and you lift a 35kg box 5m how much work do you do?

1716.75 N*m

A crane that is 13m long and is at a 20 degree angle to the ground can hold a load of 296N. What is the torque on the crane?

1,316.10 N*m

A cylinder with a radius of 1.3m has a mass hanging from it with a weight on 13 N. When the weight is released it causes an angular acceleration of 9rad/s^2. What is the moment of inertia for the cylinder?

10.985 kg*m^2

work done by you * .57=35*g*5

solve.

Torque= 13*sin20*296

Torque= I * angular acceleration
use this to solve the third.

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