Consider a wire of a circular cross-section with a radius of r = 3.03 mm. the magnitude of the current density is modeled as j = cr2 = 5.25 ✕ 106 a/m4 r2. what is the current (in a) through the inner section of the wire from the center to r = 0.5r?

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).