Asolid cylinder of mass 10 kg is pivoted about a frictionless axis thought the center o. a rope wrapped around the outer radius r1 = 1.0m, exerts a force f1 = 5.0 n to the right. a second rope wrapped around another section of radius r2 = 0.50 m exerts a force f2 = 6.0 n downward. what is the angular acceleration of the disk?

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.