- 1(current)
Q. No.The viscous drag acting on a metal sphere of diameter \(1\) mm, falling through a fluid of viscosity \(0.8\) Pa-s with a velocity of \(2\) m s–1 is nearly equal to:
| 1. | \(15\times 10^{-3}~\text{N}\) | 2. | \(30\times 10^{-3}~\text{N}\) |
| 3. | \(1.5\times 10^{-3}~\text{N}\) | 4. | \(20\times 10^{-3}~\text{N}\) |
Subtopic: Stokes' Law |
63%
Level 2: 60%+
NEET - 2023
Hints
The terminal velocity of a copper ball of radius \(5~\text{mm}\) falling through a tank of oil at room temperature is \(10~\text{cm}~\text{s}^{-1}\) . If the viscosity of oil at room temperature is \(0.9~\text{kg}~\text{m}^{-1}~\text{s}^{-1}\), the viscous drag force is:
| 1. | \(8.48 \times10^{-3}\) N | 2. | \(8.48 \times10^{-5}\) N |
| 3. | \(4.23 \times10^{-3}\)N | 4. | \(4.23 \times10^{-6}\) N |
Subtopic: Stokes' Law |
69%
Level 2: 60%+
NEET - 2022
Hints
A small sphere of radius \(r\) falls from rest in a viscous liquid. As a result, heat is produced due to the viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to:
| 1. | \(r^3\) | 2. | \(r^2\) |
| 3. | \(r^5\) | 4. | \(r^4\) |
Subtopic: Stokes' Law |
56%
Level 3: 35%-60%
NEET - 2018
Hints
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- 1(current)
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