How much energy is produced in the burning of $1\, kg$ of coal?

Why are the winds coming from the sea cool in summer?

At which temperature is the specific heat of water minimum (in $^\circ C$)?

Three bodies $A, B$ and $C$ of masses $m, m$ and $\sqrt{3}m$ respectively are supplied heat at a constant rate. The change in temperature $\theta$ versus time $t$ graph for $A, B$ and $C$ are shown by $I, II$ and $III$ respectively. If their specific heat capacities are $S_A, S_B$ and $S_C$ respectively,then which of the following relations is correct? (Initial temperature of body is $0\,^{\circ}C$)

$4200\, J$ of work is required for:

Explain the heat capacity of a substance and write its equation and unit.