What is the power developed by a motor running at 30 rev/s and developing a torque of 4 kN m? A steel pin of length 100 mm and cross-sectional area 500 mm2 is subject to an axial load of 10 kN. What...

What is the power developed by a motor running at 30 rev/s and developing a torque of 4 kN m?

A steel pin of length 100 mm and cross-sectional area 500 mm2 is subject to an axial load of 10 kN. What is the extension of the pin and the strain energy stored in it? The steel has an elastic modulus of 210 GPa.