Atennis ball is hit at an angle of 20° to the horizontal with a velocity of 21 m/s. what is its velocity in the y-direction? a. 7.2 m/s b. 19.7 m/s c. 6.8 s d. 0.9°

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