Homework Help: College Physics

Posted by Ree on Wednesday, November 24, 2010 at 1:29am.

A string that passes over a pulley has a 0.331g mass attached to one end and a 0.625g mass attached to the other end. The pulley, which is a disk of radius 9.50cm , has friction in its axle.
What is the magnitude of the frictional torque that must be exerted by the axle if the system is to be in static equilibrium?

College Physics - MathMate, Wednesday, November 24, 2010 at 9:46am
Difference in mass, Δm
= 0.625-0.331 g
= 0.294/1000 kg
= 0.000294 kg

Radius, r
= 9.5 cm
= 0.095 m

Torque required
=Δm * r Nm

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