Why is the wind coming from the sea cool at the shores?

$50 \text{ g}$ of copper is heated to increase its temperature by $10^{\circ} \text{C}$. If the same quantity of heat is given to $10 \text{ g}$ of water,the rise in temperature is (specific heat of $\text{Cu} = 420 \text{ J kg}^{-1} {}^{\circ} \text{C}^{-1}$ and specific heat of water is $4200 \text{ J kg}^{-1} {}^{\circ} \text{C}^{-1}$) (in $^{\circ} \text{C}$)

The specific heat $C$ of a solid at low temperature shows temperature dependence according to the relation $C = D T^{3}$,where $D$ is a constant and $T$ is the temperature in Kelvin. $A$ piece of this solid of mass $m \ kg$ is taken and its temperature is raised from $20 \ K$ to $30 \ K$. The amount of heat required in the process in energy units is

$A$ metal cube absorbs $2100.0 \ J$ of heat when its temperature is raised by $2^{\circ} C$. If the specific heat of the metal is $900 \ J \ kg^{-1} K^{-1}$,then the mass of the cube is (in $kg$)

$A$ solid of $2 \,kg$ mass absorbs $50 \,kJ$ when its temperature is raised from $20^{\circ} C$ to $70^{\circ} C$. The specific heat capacity of this solid in units of $J / kg^{\circ} C$ is

How many $sec$ are required to raise the temperature of $1\, litre$ of water from $20\,^oC$ to $40\,^oC$ using an $836\, W$ heater?