Your body is pushing down on a chair because it is being attracted by gravity, the reason that your body is not moving down because there is a normal force acting on your body; together the net force of weight (m*g) and normal force is equal to zero
Answer:
if the frequency of the wave if tripled then period of wave gets tripled
Well, those are good ones. Now how about a <u><em>thermometer</em></u> to <em>measure the temperature</em> ?
Mass= density x volume
1.3 kg/m^3 x ( 2.5x4x10) m^3
= 130 kg
