Meriam, Kraige & Bolton — Plane Kinetics of Rigid Bodies: Problem 6_106

6/106 The uniform slender bar $ABC$ weighs $6\text{ lb}$ and is initially at rest with end $A$ bearing against the stop in the horizontal guide. When a constant couple $M = 72\text{ lb-in.}$ is applied to end $C$, the bar rotates causing end $A$ to strike the side of the vertical guide with a velocity of $10\text{ ft/sec}$. Calculate the loss of energy $\Delta E$ due to friction in the guides and rollers. The mass of the rollers may be neglected.