Explanation
Effective weight W’ = m(g – a) which is less than actual weight mg, so the length of spring decreases.
Pressure = hρg i.e., pressure at the bottom is independent of the area of the bottom of the tank. It depends on the height of water upto which the tank is filled with water. As in both the tanks, the levels of water are the same, pressure at the bottom is also the same.
As according to Bernoulli’s principle, an ideal fluid has streamline flow in a tube of non uniform cross-section, then the sum of pressure energy, kinetic energy and potential energy at any cross-section per unit volume is constant.
Since, the fluid move from higher pressure to lower pressure and in a fluid, the pressure increase with increase of depth. Hence, the pressure Po will be lesser at the top than that at the bottom (Po + hpg) So, the air bubble moves from the bottom to the top and does not move sideways, since the pressure is same at the same level. Further in coming from bottom to top the pressure decreases. According to Boyle’s law pV = Constant.
Therefore, if pressure decreases the volume increases, it means radius increases.
Smaller the area, larger the pressure exerted by a force.
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