Let h be a solid hemisphere of radius a where the density at any point is proportional to the distance from the center of the base.
(a) find the mass of h.
(b) find the center of mass of h.
(c) find the moment of inertia of h about its axis.

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas

it's a b and

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.