Answer:
When we immerse an empty plastic bottle in a bucket of
water, the upward force (up thrust or buoyant force) exerted by water on the
bottle is greater than its own weight, therefore it comes above the surface of
water.
To keep the bottle completely immersed, an external force
which is equal to the difference between the upward force and the weight of the
bottle must be applied on the bottle in downward direction. This is because the
up thrust on the bottle due to water must be balanced.
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