If the length of a resistance arm of a lever is 15,5 m, and the length of the effort arm is 2.50 m, what is the mechanical advantage of the lever? O A 0.16 O B. 1.0 O C. 1.16 OD 2.0​

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.