Please refer to the attachment for complete questions (with figures/diagrams).
3.7) Compute the moment of the 100-lb force about A, (a) by using the definition of the moment of a force, (b) by resolving the force into horizontal and vertical components, (c) by resolving the force into components along AB and in the direction perpendicular to AB.
3.43) A force P of magnitude 25 lb acts on a bent rod as shown. Determine the moment of P about (a) a line joining points C and F, (b) a line joining points O and C.
3.69) The 12-ft boom AB has a fixed end A, and the tension in the cable BC is 570 lb. Replace the force that the cable exerts at B by an equivalent force-couple system at A.
4.63) A 7-ft boom is held by a ball and socket at A and by two cables EBF and DC; cable EBF passes around a frictionless pulley at B. Determine the tension in each cable.
4.65) The horizontal platform ABCD weighs 60 lb and supports a 240-lb load at its center. The platform is normally held in position by hinges at A and B and by braces CE and DE. If brace DE is removed, determine the reactions at the hinges and the force exerted by the remaining brace CE. The hinge at A does not exert any axial thrust.
4.82) A block of mass m = 20 kg rests on a rough plane as shown. Knowing that alpha = 25 degree and mu_s = 0.20, determine the magnitude and direction of the smallest force P required (a) to start the block up the plane, (b) to prevent the block from moving down the plane.
Step by step solutions provided.