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Q.

If the terminal speed of a sphere of gold  density =19.5kgm−3 is 0.2ms−1 in a viscous liquid  density =1.5kgm−3, find the terminal speed of a sphere of silver  density =10.5kgm−3 of the same size in the same liquid.

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a

0.133 ms−1

b

0.1 ms−1

c

0.2 ms−1

d

0.4 ms−1

answer is B.

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Detailed Solution

VT gold VT silver =19.5−1.510.5−1.5=2  [ Terminal velocity is proportional to the difference in the densities between the solid and the liquid.]VTS=0.1ms−1
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