A rigid massless rod of length 3 l has two masses attached at each end as shown in the figure. The rod is pivoted at point P on the horizontal axis. When released from the initial horizontal position, its instantaneous angular acceleration will be

Question

A rigid massless rod of length 3 l has two masses attached at each end as shown in the figure. The rod is pivoted at point P on the horizontal axis. When released from the initial horizontal position, its instantaneous angular acceleration will be, g 2 l, 7 g 3 l, g 3 l, g 13 l

MARKS App · Accepted Answer

Both the weight will produce torques in opposite directions, τ net = I α (where I → moment if inertia about axis of rotation) 5 m g l - 2 m g 2 l = 2 m 2 l 2 + 5 m l 2 α α = g 13 l

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