Agas of molecules, each of mass m, is in thermal equilibrium at the absolute temperature t. denote the velocity of a molecule by v, its three cartesian components by vx , vy , vz and its speed by v. what are the following mean values?

(i) bar vx

(ii) bar vx2 note bar means drawing straight line over (mean value)

(iii) bar v2 vx

(iv) bar vx3vy

(v) bar (vx + bvy)2

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.