How do you know if a problem is worth spending the time and effort to try to solve?

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

What are the major differences between injection molding and extrusion?

When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?