Question

A bottle with narrow neck rests on its base.If it is placed upside down ,how does the i.)thrust ii)pressure change .

Answer 1

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All the thrust on the bottle will be due to the weight of the bottle.

It does not matter how the bottle is kept, the thrust will always be the same as the weight of the bottle does not change with its position.

However, when the bottle is kept upside-down, the pressure on the bottle will increase as compared to the bottle upright.

This is due to the fact that the area of contact for the upright bottle is its base, which is larger than the area of contact for the upside-down bottle, which is the narrow neck.

Since pressure is inversely proportional to the area in contact, the upside-down bottle will experience greater pressure than the upright bottle.

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