Upthrust on a body immersed in a fluid is equal to
Correct answer: B. the weight of the fluid displaced by the body
- A. the weight of the body
- B. the weight of the fluid displaced by the body
- C. the volume of the body
- D. the density of the fluid
Explanation
This is Archimedes's principle, and the upthrust arises because pressure increases with depth, so the upward force on the bottom of the body exceeds the downward force on the top. A body floats when the upthrust at partial immersion already equals its weight. The principle also explains why a body appears lighter when weighed in water.
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About Fluid Flow
Fluid flow covers pressure, density, viscosity and the motion of liquids and gases through pipes or open channels. It includes the continuity equation, Bernoulli equation, streamline and turbulent flow, and the effects of changing area, height and speed. Viscosity and ideal fluid assumptions must not be confused with pressure effects.
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