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In the fig shown below, friction force b...

In the fig shown below, friction force between the bead and the light string is `(mg)/4` if `t=sqrt((nl)/(7g))` where t is the time in which the bead loose contact with the string after the system is released from rest, find n

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The correct Answer is:
8
acceleration of bead `= (3g)/(4)(darr)`
acceleration of thread `=g (uarr)`
relative acceleration `= (7g)/(4)(darr)`
`:. l = (1)/(2) at^(2), t = sqrt((8l)/(7g)` .
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