A uniform horizontal lighting boom is 3.0 m long and pivots at the wall. Its weight is 120 N. A lamp weighing 80 N hangs 2.4 m from the pivot. A vertical cable supports the boom at its outer end.
Calculate the force in the cable when the boom is in rotational equilibrium.
The cable is moved so that it supports the boom 2.0 m from the pivot. Calculate the new force in the cable when the boom is in rotational equilibrium.