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Block A of weight 100 N rests on a frict...

Block A of weight 100 N rests on a frictionless inclined plane of slope angle `30^(@)`. A flexible cord attached to A passes over a frictionless pulley and is connected to block B of weight w. Find the weight w for which the system is in equilibrium

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When system is in equilibrium
mg sin `theta = T`
and for block B weight
Comparing ( 1 ) and (2)
W = mg sin `theta`
`=100 sin 30^(@)`
`100 xx (1)/(2)`
`=50 N`
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