Homework Help: physics

Posted by Samuel on Monday, October 13, 2008 at 2:32am.

A pendulum consists of an object of mass 1.07 kg that hangs at the end of a massless bar, a distance 1.14 m from the pivot point. Calculate the magnitude of the torque due to gravity about the pivot point if the bar makes an angle of 22° with the vertical.

torque = weightpendulum*cos22*1.14
= 1.07 kg x cos22 x 1.14
= -1.22 kg
= 1.22 kg

Why am I getting this answer incorrect?

physics - drwls, Monday, October 13, 2008 at 2:38am
I don't see g = 9,8 m/s^2 in your calculations. Torque is caused by GRAVITY in this case.

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