When an empty bottle is closed air-tight and pushed inside water it bounces back when it is released. This is because ________.
Upthrust of water on a bottle is greater than the gravitational force acting on the bottle
The correct answer is option 1, i.e., Upthrust of water on a bottle is greater than the gravitational force acting on the bottle.
The bottle bounces back when released underwater because the upthrust (buoyant force) of water on the bottle is greater than the gravitational force acting on it.
Here's why:
An empty, airtight bottle contains air, making it less dense than water.
When submerged, water exerts an upward buoyant force on the bottle.
Since this upthrust > weight of the bottle, the bottle experiences a net upward force and rises back up.
This is an example of Archimedes’ principle in action.
Important Questions from Pressure
Deep-sea diving vessels have to withstand pressure from the crushing effect of seawater acting-
The pressure increases with-
- At high altitudes, the air pressure is _______ than at sea level.
The atmospheric pressure at sea level is ________, and is taken as the normal atmospheric pressure.
The standard atmospheric pressure can not be expressed as
