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When an empty bottle is closed air tight and pushed inside water it bounces back when it is released. This is because _________.
water does not exert force on an empty bottle
gravitational force on a bottle is equal to the buoyant force of the water
upthrust of water on a bottle is greater than the gravitational force acting on the bottle
gravitational force acting on the bottle is greater than the upthrust of water
upthrust of water on a bottle is greater than the gravitational force acting on the bottle
When an airtight empty bottle is pushed underwater, it experiences an upward buoyant force (upthrust) due to the displaced water. Since the weight of the air-filled bottle is much less than the weight of the water it displaces, the upthrust is greater than the downward gravitational force, causing the bottle to bounce back to the surface when released.
When an airtight empty bottle is pushed underwater, it experiences an upward buoyant force (upthrust) due to the displaced water. Since the weight of the air-filled bottle is much less than the weight of the water it displaces, the upthrust is greater than the downward gravitational force, causing the bottle to bounce back to the surface when released.
Trying to push a floating plastic ball or an empty sealed water bottle to the bottom of a bucket of water requires continuous muscular force; the moment you let go, it rapidly shoots back up to the surface.
UP for Upthrust: Less density than water means UP you go!
FbтАЛ=╧БтЛЕVтЛЕg тАФ Archimedes' Buoyant Force formula
FnetтАЛ=FbтАЛтИТW тАФ Net upward force causing the bottle to bounce back
According to Archimedes' principle, any object immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced by it (FbтАЛ=VтЛЕ╧БтЛЕg). An empty airtight bottle encloses a large volume of low-density air, making its average density significantly less than that of water. When submerged, the upward upthrust exerted by the surrounding water easily overcomes the gravitational force (weight) acting on the bottle, creating a net upward force that accelerates it to the surface.
An airtight empty bottle contains air, making its overall density much smaller than water.
When pushed underwater, it displaces a volume of water whose weight is greater than the total weight of the bottle.
The upward thrust (buoyancy) exerted by water exceeds the downward gravitational pull.
Upon release, the net upward force rapidly accelerates the bottle to the water surface.
Demonstrates Archimedes' Principle clearly in daily life
Explains floating and sinking behavior of hollow objects
Working of submarines (adjusting ballast tanks to control buoyancy)
Life jackets and floating buoys
Hot air balloons operating on similar buoyancy principles in gases
Density of water is approximately 1000┬аkg/m3, whereas the average density of an empty sealed plastic bottle is substantially lower.
Option A is incorrect because water exerts considerable hydrostatic force on all submerged objects.
Option B is incorrect because if gravitational force equaled buoyant force, the bottle would remain suspended neutrally at any depth instead of bouncing back.
C is correct тАФ upthrust of water on a bottle is greater than the gravitational force acting on the bottle
Remember that floating occurs when average density is less than fluid density (dobjectтАЛ<dfluidтАЛ), meaning upthrust exceeds weight (FbтАЛ>W).
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