physics

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A metal rod of length 90cm has a disc of radius 24cm fixed rigidly at its centre,and the assembly is pivoted from its centre.
Two forces each of magnitude 30N,are applied normal to the rod at each end so as to produce a turning effect.A rope is attached to the edge of the disc to prevent rotation.

calc.
a)the torque of the couple produced by the 30N forces.
b)The tension T in the rope.

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