a. State the two conditions necessary for an object to be in equilibrium.
b. A metal rod of length 90 cm has a disc of radius 24 cm fixed rigidly at its centre, as shown. The assembly is pivoted at its centre.

Two forces, each of magnitude 30 N, are applied normal to the rod at each end so as to produce a turning effect on the rod. A rope is attached to the edge of the disc to prevent rotation.
Calculate:
i. The torque of the couple produced by the 30 N forces
ii. The tension T in the rope.

Transcribed Image Text:

90 cm 30 N 24 cm T 30 N rope Figure 4.36