The table lamp consists of two uniform arms, each weighing 0.8 lb, and a 2-lb bulb fixture. If θ = 16◦, calculate the couple CA that must be supplied by the friction in joint A

Determine the magnitude of the moment of P about the y-axis in Nm

Show FBD and complete solution.    The pin spanner is used to turn shafts and collars. If a moment of is required to turn the 200-mmdiameter collar about its center O under the action of the applied force P, determine the contact force R on the smooth surface at A. Engagement of the pin at B may be considered to occur at the periphery of the collar.