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Q.

Sand is to be piled up on a horizontal ground in the form of a regular cone of a fixed base of radius R. Coefficient of static friction between the sand layers is  μ . Maximum volume of the sand that can be piled up in the form of cone without slipping on the ground is

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a

μR33π

b

μR33

c

πR33μ

d

μπR33

answer is D.

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Detailed Solution

μ=Tanθ=hR                  v=13πR2h

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Sand is to be piled up on a horizontal ground in the form of a regular cone of a fixed base of radius R. Coefficient of static friction between the sand layers is  μ . Maximum volume of the sand that can be piled up in the form of cone without slipping on the ground is