A lead ball moving with a velocity $V$ strikes a wall and stops. If $50\%$ of its energy is converted into heat, then what will be the increase in temperature (Specific heat of lead is $S$)

By what the temperature difference can be determined if the state of substance is not changed for the absorption of given heat ?

The height of victoria falls is $63\, {m}$. What is the difference in temperature of water at the top and at the bottom of fall ? (In $^{\circ} {C}$)

[Given $1\, {cal}=4.2\, {J}$ and specific heat of water $\left.=1 \,{cal} \,{g}^{-1}\;{ }^{\circ}\, {C}^{-1}\right]$

Why water is used as coolant in automobile radiator ?

Water falls from a height of $210\,m.$ Assuming whole of energy due to fall is converted into heat the rise in temperature of water would be   ………. $^oC$  $(J = 4.3 \,Joule/cal)$