A drum A, of mass 200 kg, external diameter 380 mm and radius of gyration 150 mm, rotates on frictionless bearings at 250 rev/min. A stationary drum, B, of mass 50 kg, external diameter 200 mm and radius of gyration 80 mm, mounted on a frictionless axis parallel to that of A, is pressed into contact with A with a force of 90 N. The coefficient of friction is 0·25. Determine: The final speeds of A and B.  (b) The time of slipping.  (c) The time of slipping if a torque is applied to A, to maintain the speed of A as a constant 250 rev/min.

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.