Figure shows a laptop made of two identical uniform plates, each of mass m=1 kg connected by a hinge and placed on a rough horizontal surface as shown. The hinge is locked when the screen makes an angle of 120° from the keypad of the laptop. Assume that the laptop does not slide on the horizontal surface, then what is the minimum force (in newton) that can be applied on the top of the laptop, in the plane of the page to cause the bottom of the laptop to lift off the ground?
$(Take g = 10 m / s^{2})$

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Detailed Solution

From torque equilibrium about O
$F l + mg \frac{l}{2} \frac{1}{2} = mg \frac{l}{2} F = \frac{mg}{4}$
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