1. A plane progresive wave is represented by y =3(200 +7.5x), Where the symbols have their usual meanings. The wavelength and speed of the respectively are
a 1.75m,57m/s
b 0.57m,100m/s
C 0.27m, 27m/s
D.175m, 100m/s

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