1 point 83. The line of action of Force F = (i - 2j) N passes through the point
whose vector is (-j + k) m. The moment of F about the origin in Nm is
O (2j + j)
(21 + i + k)
(i + i + k)
(i + 2) + k)

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.