Answer in Brief

Suppose the glass of the previous problem is covered by a jar and the air inside the jar is completely pumped out. (a) What will be the answers to the problem? (b) Show that the answers do not change if a glass of different shape is used provided the height, the bottom area and the volume are unchanged.

Advertisement Remove all ads

#### Solution

When the glass is covered by a jar and the air is pumped out of the jar, atmospheric pressure has no effect on the glass.

(a) Force exerted on the bottom:

(hρ_{w}g) × A

=(20 × 10^{-2} × 10^{3} × 10)20 × 10^{-4}

= 4N

(b) mg = h × ρ_{w }× g × A + F_{s}

⇒ Fs = 5 - 4 =1N

c) If we use a glass of different shape with same volume, height and area, then there will not be any change in the answer.

Is there an error in this question or solution?

Advertisement Remove all ads

#### APPEARS IN

Advertisement Remove all ads

Advertisement Remove all ads