JEE Main 2024 Physics question
A spherical ball of radius 1 × 10⁻⁴ m and density 10⁵ kg/m³ falls freely under gravity through a distance h before entering a tank of water, If after entering in water the velocity of the ball does not change, then the value of h is approximately : (The coefficient of viscosity of water is 9.8 × 10⁻⁶ Ns/m²)
Answer: (C)
Solution
The velocity does not change in water, so it equals the terminal velocity: = (2/9)R²g(ρ_B − ρ_L)/η =
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