Why the water is used in the rubber bag for the fomentation on body ?

A $10\, kW$ drilling machine is used to drill a bore in a small aluminium block of mass $8.0\, kg .$ How much is the rise in temperature of the block in 2.5 minutes, assuming $50\, \%$ of power is used up in heating the machine itself or lost to the surroundings. Specific heat of aluminium $=0.91\,J\,g^{-1}\,K^{-1}$ 

Water falls from height $500\,m$. The rise in temperature of water at bottom if whole of energy remains in water, will be …….. $^oC$  [sp. heat of water $4.2\,KJ/kg$ ]

What is the heat capacity of copper of $40\,g$ and specific heat $0.3\,erg \,g^{-1}\left({ }^{o}\, C \right)^{-1}$ ?

The figure below shows the variation of specific heat capacity $(C)$ of a solid as a function of temperature $(T)$. The temperature is increased continuously from $0$ to $500 \ K$ at a constant rate. Ignoring any volume change, the following statement$(s)$ is (are) correct to a reasonable approximation.$Image$

$(A)$ the rate at which heat is absorbed in the range $0-100 \ K$ varies linearly with temperature $T$.

$(B)$ heat absorbed in increasing the temperature from $0-100 \ K$ is less than the heat required for increasing the temperature from $400-500 \ K$.

$(C)$ there is no change in the rate of heat absorbtion in the range $400-500 \ K$.

$(D)$ the rate of heat absorption increases in the range $200-300 \ K$.