What is the efficiency of a heat engine, which performs a mechanical work of 138MJ, consuming 6 kg of gasoline? Help much appreciated :)

Where do magnetic lines of force enter earth?

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).

If anyonee has done the momentum lab practical in physics can you give me the answers i am s lostt rnn : (