Forces Acting on Particle and Rigid Body

What are the characteristics of a couple? In the system shown in figure, a 5 m long pole is held in vertical position by three guy wires AB, AC and AD. If the tension of 600 N is induced in AD and the resultant force at A is to be vertical, determine the tension in cables AB and AC.

A tripod supports a load of 2.5 kN at point P as shown in figure. The end points A, B, C of the three legs are in the x-z plane. Make calculations for the force developed in each leg. Explain free body diagram and its importance.

Figure below shows a particular position of 200 mm connecting rod AB and 80 mm long crank BC. At this position, the connecting rod of the engine experiences a force of 3000 N on the crank pin at B. Find its (i) horizontal and vertical component, (ii) component along BC and normal to it.