Find out the reactions at supports.

For the structural beam loaded and supported as shown in Figure 2, (a) Draw a free body diagram and find the support reaction forces/moments.

How can the shear force, be determined from the method of sections andthe equations of equilibrium?

A alank of wood is fixed to a wall using a hinge. When the angle between the plank and the wall is 45°, a spring is attached to the wood 25cm from the hinge and fixed to the wall so that it is horizontal (Diagram A). The wood is then pushed downwards until it is perpendicular to the wall (Diagram B). The force exerted by the spring, depends on its length. As the spring stretches, the force it exerts increases. A graph showing this relationship is below. 70 Diagram B 60 Diagram A spring 50 90° 20 25cm 45 90° 10 25cm hinge 10 35 15 20 25 30 Spring Length (cm) (a) Calculate the length of the spring in Diagrams A and B. (b) Calculate the torque produced by the spring on the plank of compare the values. around the hinge in 4 oth Diagrams A and B and Force (N)