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Question

A cubical block (side 2 m) of mass 20 kg slides on inclined plane lubricated with the oil of viscosity η=101 Poise with constant velocity of 10 m/s. Find out the thickness of the layer of liquid. (g=10m/s2)



A
4×103 m
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B
3×103 m
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C
2×103 m
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D
1×103 m
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Solution

The correct option is A 4×103 m
We know that , Fv=ηAdvdz=ηAvh


Balancing forces along inlined plane,
mgsinθ=Fv=ηAvh
20×10×sin30=102×4×10h
h=4×103 m=4 mm

Physics

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