The total K.E. of all the molecules of helium having a volume V exerting a pressure P is $1500 J$ . The total K.E. in joules of all the molecules of 2 having the same volume v and exerting a pressure 2p is

A block rests on an inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between block and the plane is 0.8. If the frictional force on the block is 10 N, then mass of block (in kg) (Take g = 10 m/s² )

In a container, 1 g of hydrogen and 1 g of oxygen are taken. Find the ratio of hydrogen pressure to oxygen pressure,

Find the temperature of H₂ gas at which its rms speed is equal to that of O₂ at 47°C.

In an isobaric process, the absolute temperature is doubled. The mean free path (l) and the  relaxation time (t) will become respectively

At which of the following temperatures does any gas have average molecular kinetic energy double that of at ${20}^{0}C$ ?