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A block placed on a rough inclined plane...

A block placed on a rough inclined plane of inclination `(=30^(@))` can just be pushed upwards by applying a force "F" as shown. If the angle of incrination of the inclined plane is increased to `(theta 60^(@)),` the same block can just be prevented from sliding down by application of a force of same magnitude. The coefficient of friction between the block and the inclined plane `(sqrtn -1)/(sqrtn +1)`where n is

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The minimum force required to move a body up an inclined plane is three times the minimum force required to prevent it from sliding down the plane. If the coefficient of friction between the body and the inclined plane (1)/(2sqrt3) ,is the angle of the inclined plane is