Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11

# Suppose the Glass of the Previous Problem is Covered by a Jar and the Air Inside the Jar is Completely Pumped Out. - Physics

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.

#### 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:

(hρwg) × A

=(20 × 10-2 × 103 × 10)20 × 10-4

= 4N

(b) mg = h × ρw × g × A + Fs

⇒ 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.

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#### APPEARS IN

HC Verma Class 11, 12 Concepts of Physics 1
Chapter 13 Fluid Mechanics
Q 5 | Page 273