Physics
The upthrust is maximum (= FB) when the body is:
- floating in the liquid
- completely immersed inside the liquid
- partially immersed inside the liquid
- None of these
Fluids Upthrust
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Answer
completely immersed inside the liquid
Reason — As FB = volume of submerged part of body x density of liquid x g
Hence, FB will be maximum when the body is completely immersed inside the liquid.
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Related Questions
A piece of stone of mass 15.1 g is first immersed in a liquid and it weighs 10.9 gf. Then on immersing the piece of stone in water, it weighs 9.7 gf. Calculate —
(a) the weight of the piece of stone in air,
(b) the volume of the piece of stone,
(c) the relative density of stone,
(d) the relative density of the liquid.
For a floating body, its weight W and upthrust FB on it are related as:
- W > FB
- W < FB
- W = FB
- nothing can be said
When the weight of a body is greater than the weight of the liquid displaced, the body will
- float
- sink
- float partially outside
- first go down then come up
A body weighing W floats partially above and partially below the liquid when (F'B denotes maximum upthrust) :
- W > F'B
- W = F'B
- W < F'B
- none of these