A shaft is to be designed to transmit 10kW of power at 2000rpm. The shear stress must be kept below 300MPa and the shear modulus is 75GPa. The shaft is 1m long and must have less than 2표of rotation from end to end. Determine the minimum required diameter.

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

In a system, when potential energy decreases, then entropy also decreases. true false

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.