Question
A spherical ballof radius 3.0×10−4m and density 104 kg/m3 falls freely under gravity through a distance h it before entering a tank of water (coefficient of viscosity = η = 9.8×10−6Nsm−2 and density = 103kg/m3. If after entering the water, the velocity of the ball does not change, find~h.(Take g =9.8 ms−2)
Answer: Option B
:
B
Terminal velocity,
u=√2gh=2r2(ρ−σ)g9η⇒h=2gr4(ρ−r)281η2=1.65km
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:
B
Terminal velocity,
u=√2gh=2r2(ρ−σ)g9η⇒h=2gr4(ρ−r)281η2=1.65km
Was this answer helpful ?
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