Air enters a nozzle steadily at 2.21 kg/m3 and 45 m/s and leaves at 0.762 kg/m3 and 150 m/s. If the inlet area of the nozzle is 80 cm2, what would be the mass flow rate through the nozzle and the exit area of the nozzle? Select one: O a. 0.796 kg/s and 69.6 cm2 O b. 0.53 kg/s and 38.7 cm2 O c. 0.796 kg/s and 38.7 cm2 O d. 0.53 kg/s and 69.6 cm2

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An electric hot water heater consumes 3.1 kilowatts of electricity and converts it to heat. How long will it take the water heater to heat a 67 gallon tank of water from 10 degrees Celsius to 50 degrees Celsius? (1 kilogram of water is 0.37 gallons, 1 Calorie = 4200 J).  It may be helpful to refer back to the weekly handout for guidance on this problem. Your final answer should be in minutes (rounded to the nearest 10 minutes).