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
The pressure inside the cabin of the aircraft flying at an altitude is
A. The same as that outside.
B. Less than that outside.
C. More than that outside.
D. Normal atmospheric pressure at sea level.- How many Pascals are equivalent to $0.25$ bar?
A camel can walk/run in deserts very easily as compared to horse, donkey etc, because is-
What is the thrust on unit area called?
Calculate the pressure (in Pa) if a thrust of 1000 N is applied to an area of 5 m 2.
