Determine the total reaction at pin C if W=100N. Negligible weights of members and friction. Determine the tension in the cable if W=100N. Negligible weights of members and friction. If the breaking strength of the cable is 2000N, determine the maximum weight W that can be supported. Negligible weights of members and friction.

As shown, a truss is loaded by the forces P = 491 lb and P2 = 194 lb and has the dimension a = 9.50 ft . P1 H - P2 a E В С D a a- a/2 al2 Determine FBC , the magnitude of the force in member BC, using the method of sections. Assume for your calculations that each member is in tension, and include in your response the sign of each force that you obtain by applying this assumption. Express your answer numerically in pounds to three significant figures.

2

Q1) A man is pulling a spring of stiffness coefficient 8 Ib/in by his hand with the entire arm held horizontally rotating about shoulder joint O; this force acts at the 21° angle is shown. Determine the force exerted by the deltoid muscle on the upper arm at A and x- and y- components of the force reaction at the shoulder joint. The weight of the upper arm Wu = 4.1 Ib, the weight of the lower arm W1 2.4 Ib, and the weight of the hand WH= 0.9 Ib; all these weights act at the locations shown in the figure. the spring extended 1 in only as shown in figure 1. A tensile force in the deltoid muscle prevents the arm from A- 8 Ibin Equilibrium x-1 in Deltoid muscle Fo A YW, YW -5.2 16.5 25.4 Figure 1