Figure shows a wheel pivoted at its centre in a water tank containing 1 kg water. A light string is wound on the shaft of the wheel and its other end is connected to a hainging block of mass 12 kg as shown. It is observed that the block falls slowly by a distance 0.7 m. Find the rise in temperature of the water. Also find the amount of theat supplied to the water. Give that the specific heat fo water is `4200J//kg^(@)C` and that of wheel is negligible.

Answer

`0.02^(@)C`,0