1.

The greatest height h of the sand pile that can be erected without spilling the sand onto the surrounding circular area of radius R (If mu is the coefficient of friction between sand particles) is

Answer»

R
`(R )/(mu)`
`muR`
`mu^(2)R`

Solution :Retardation is given to be half of acceleration. So distance covered during this time will be 2S. Thus the distance covered during uniform motion is 12S.
`THEREFORE ""12S =VT =SQRT(2dS)t`
`144S^(2)=2dS t^(2)`
`S=(1)/(72)dt^(2)`


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