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July 24, 2014

Homework Help: Physics (torque, if possible)

Posted by Anderson on Wednesday, April 18, 2007 at 6:58pm.

An electric motor turns a flywheel through a drive belt that joins a pulley on the motor and a pulley that is rigidly attached to the flywheel. The flywheel is a solid disk with a mass of 80.0kg and a dimaeter of 1.25m. It turns on a frictionless axle. Its pulley has much smaller mass and a radius of 0.230m. If the tension in the upper (taut) segment of the belt is 135 N and the flywheel has a clockwise angular acceleration of 1.67 rad/s^2, find the tension in the lower (slack) segment of the belt.

Sol: This problem seems to involve torque; I think solid disc Icm (moment of intertia) is 1/2MR^2; there are other unknown I'm sure but if someone can walk me through this problem (step by step), I'd be most appreciative. I have a test tomorrow. I tried and tried, but finally gave up as I must move on to other practice problems.

force net= upper force - lower force

But force net* radiuspulley= Itotal*angacceleration.

Now I total is the sum of the flywheel and the pulley.

Solve for lower force.

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