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Physics - Fluid Question with Solution | TestHub

PhysicsFluidViscosityHard2 minPYQ_2021

PhysicsHardsingle choice

A body of density $ρ$ is dropped from (at rest) height ' $h$ ' into a lake of density ' $δ$ ' $(δ > ρ)$ . The maximum depth to which the body sinks before returning to float on the surface is [Neglect all dissipative forces]

Options:

Answer:

Solution:

The velocity of the body when it reaches the surface of the lake is
$\frac{a}{g} = \frac{δ - ρ}{ρ} ∴ a = (\frac{δ - ρ}{ρ}) g$ If $a$ is the acceleration and retardation in the liquid then $v^{2} = 2 ad$ by eq. (1) and (4) $2 ad = 2 gh ∴ d = \frac{g}{a} h ∴ d = \frac{ρ}{δ - ρ} h$

Stream:MHT_CETSubject:PhysicsTopic:FluidSubtopic:Viscosity

⏱ 2mℹ️ Source: PYQ_2021

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