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Q.

The velocity of a small ball of mass 0.3g and density 8g/cc when dropped in a container filled with glycerine becomes constant after some time. if the density of glycerine is 1.3g/cc , then the value of viscous force acting on the ball will be 
X x 10-4N, the value of x is ____. (use g =10 m / s2 )

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answer is 25.

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Detailed Solution

FV+FB=mg(V= constant )Fv=mgFB=ρBVgρlVg=ρBρLVg=(81.3)×10+30.3×1038×103×10=25×104N
Hence the value of viscous force acting on ball will be 25×104N
Compare with X×104, we get X=25

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