$80\ g$ of water at $30^o C$ is poured on large block of ice at $0^{\circ}$C. The mass of ice that melts is

Given, Latent heat = $334\ J/g$

Specific heat of water $= 4.2 Jg^{-1}C^{o-1}$

A gas expands isthermally an reversibly.The work done by the gas is ______.

Two spheres $A$ and $B$ with masses in the ratio $2 : 3$ and specific heat $2 : 3$ fall freely rest. If the rest in their temperatures on reaching the ground in the ratio $1 : 2$ the ratio of their heights of fall is:-

An ideal gas $A$ and a real gas $B$ have their volumes increased from $V$ to $2V$ under isothermal conditions.The increase in internal energy

An ideal monoatomic gas undergoes expansion according to $P=bV$,Where 'b' is a constant.Molar heat capacity of gas in the process is