A. 14. If an object moves in the same direction and at a constant speed for 4 hours, which of the following is true?

a. The object's speed changed during the 4 hours.

b. The object's speed and average speed were equal during the entire 4 hours.

c The object accelerated during the 4 hours.

d. The object decelerated during the 4 hours.

An engine undergoes a cycle as shown in the diagram. during a complete cycle the work done by the gas is 28.5×103 j and the energy transferred thermally out is 99.4×103 j. there are 1.5×1024 gas molecules and they have three active degrees of freedom. 6. (6 pts) during which process(es) is energy transferred thermally into the gas? a. 1→2 b. 2→3 c. 4→1 d. 1→2 and 4→1 e. none of the above