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when does the upthrust force is greater or smaller in the liquid

Asked by 19th September 2013, 10:27 PM
Answered by Expert
As we know that a liquid contained in a vessel exerts pressure at all points and in all the possible directions and the pressure at a point in the liquid is same in all directions. it increases with depth inside the liquid. when a body, say a block, is immersed in a liquid, the pressure exerted upwards on the lower surface of the block(which is at a greater depth) is more than the pressure exerted downwards on the upper face of the block(which is at a lesser depth). thus there is a pressure difference between the lower and upper face of the block. since force=pressure x area, the difference between the pressures due to liquid on the two faces of the block causes the net upward force(i.e., upthrust) on the body.
Answered by Expert 20th September 2013, 2:41 PM
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