A uniform steel girder AB is 6 m long and has a Weight W = 4 kN acting at its centre. The girder rests on two supports at C and

Bas shown in the Figure 1 below.A load of 20 kN is acting on top to the girder as shown: a) Determine the magnitude of the force F that causes the beam to just lift off from the support B b) Find the magnitude of the Reaction at C;