A bullet of mass 20 gm is fired in the horizontal direction with a velocity 150 m from a pistol of mass 1 kg. Recoil velocity of the pistol is

 
The plot given above represents displacement ‘x’ of a particle with time ‘t’. The particle is

Motion, of a particle can be described in x-direction by x = a sin ωt, and y-direction by y = b cos ωt. The particle is moving on

During sunrise and sunset, sun appears reddish-orange because

A piece of paper and a coin both having the same mass are dropped from the 10th floor of a building. The piece of paper would take more time to reach the ground because

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The figure given above shows the temperature (T) – Time (t) plot when we start heating a piece of naphthalene. The temperature (T*) at the plateau of the curve signifies