Physics · 2023
JEE Main · 6 April 2023, Shift 1 · Q33
A small ball of mass M and density ρ is dropped in a viscous liquid of density ρ_o. After some time, the ball falls with a constant velocity. What is…
A small ball of mass M and density $\displaystyle \rho$ is dropped in a viscous liquid of density $\displaystyle \rho_{\mathrm{o}}$. After some time, the ball falls with a constant velocity. What is the viscous force on the ball ?
Official answer
From NTA’s final answer key for this paper.
(1)
$\displaystyle \mathrm{F}=\mathrm{Mg}\left(1-\frac{\rho_{\mathrm{o}}}{\rho}\right)$
More from Surface Tension and Viscosity
- Eight mercury drops, each of radius r, coalesce to form a bigger drop. The surface energy released in this process is ____. (S is the surface tension…2026
- Pressure inside a soap bubble is greater than the pressure outside by an amount: (given: R= Radius of bubble, S= Surface tension of bubble)2024
- The terminal velocity of a metallic ball of radius 6 mm in a viscous fluid is 20 cm/s. The terminal velocity of another ball of same material and…2026
- An air bubble of radius 1.0 mm is observed at a depth of 20 cm below the free surface of a liquid having surface tension 0.095 J / m^2 and density…2025
- A Spherical ball of radius 1 mm and density 10.5 g / cc is dropped in glycerine of coefficient of viscosity 9.8 poise and density 1.5 g / cc. Viscous…2023
- The excess pressure inside a soap bubble is thrice the excess pressure inside a second soap bubble. The ratio between the volume of the first and the…2024
- The surface tension of a soap bubble is 0.03 N / m. The work done in increasing the diameter of bubble from 2 cm to 6 cm is α π × 10^-4 J. The value…2026
- If an air bubble of diameter 2 mm rises steadily through a liquid of density 2000 kg / m^3 at a rate of 0.5 cm/s, then the coefficient of viscosity…2026
JEE Main 2023 Physics question, with the answer from NTA’s final answer key. Where our answers come from.