A charged particle enters a magnetic field and initially is moving anti-parallel to the B-field. Which of the following statements about the charge's motion is true? 1) The charge moves in a circular orbit
2) The magnitude of the velocity does not change with time
3) The direction of the velocity does not change with time

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).