(b) Fig. 3.2 shows the speed and direction of motion of an object at a point in time, 150.0 m/s
object
Fig. 3.2
The resultant force on the object is zero for 10 seconds.
Deduce the speed and direction of motion after 5 seconds. Indicate the speed and direction
of the object by drawing a labelled arrow next to the object in Fig. 3.3.

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.