The terminal velocity of a copper ball of radius \(5\) mm falling through a tank of oil at room temperature is \(10\) cm s-1. If the viscosity of oil at room temperature is \(0.9\) kg m-1 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 |
 60%
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A tall cylinder is filled with viscous oil. A round pebble is dropped from the top with zero initial velocity. From the plot shown in the figure, indicate the one that represents the velocity \((v)\) of the pebble as a function of time \((t).\)
 

1. 2.
3. 4.
Subtopic:  Stokes' Law |
 84%
From NCERT
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