Question

An axle of a mass of 10 kg, length 10 cm and radius .1 m is free to rotate about the axis which runs the length of the axle, throuhh it's center. A chain of mass 4kg is fastened to the axle at one end, wound exactly 6 times around the axle, and a rock of mass 1.8 kg attached to the open end of the chain. If the axle is released, and ignoring friction, what is the rotational speed of the axle when the entire chain first becomes vertical?
A 1.32 kg sample of some material increases in temperature from 13.5°C to 39.2°C when 1.98×104 J of heat energy is transferred to it. What is the specific heat of the material?

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