Select the answer that correctly completes the statement An eagle flying north emits a call at 2kHz. A stationary black bear is due north of the eagle.

The bear, as an observer will

A. Will hear the call at a frequency of more than 2kHz

B. Will hear the call at a frequency of 2kHz

C. Will hear the call at a frequency less than 2kHz

D. None of the above

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).