An electron with a velocity of 10^7 m/s enter into a region of magnetic flux density of 0.10T, the angle between the direction of the field and the initial path of electron being 25°.Find the axial distance between two turn of the helical path

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).