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ME326_HW2_7Sept2011

# ME326_HW2_7Sept2011 - ME 326-Homework Assignment#2 Due 7...

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ME 326-Homework Assignment #2 Due: 7 Sept 2011 Topic: Energy Text: SEH&B Chapter 2 Problem #1: How much energy must be dissipated by the braking system of a car having a mass of 2,500 lb m traveling at 70 mph in order to bring the car to rest (BTU). Problem #2: Water is pumped from the surface of a lake at a mass flow rate of 1 kg/s to irrigate a field at an elevation of 30 m above the lake surface. The water has negligible velocity at the inlet of the pump, and is discharged at 2 m/s at the outlet. Assuming specific internal energy, specific volume, pressure, and temperature of the water are the same at the pump inlet and outlet, determine: a) what forms of energy of the water must be changed by the pump in order for the water to be discharged onto the field at 2 m/s? b) what is the magnitude of the change in specific energy content of the water from the inlet to the outlet (kJ/kg)? c) since the flow rate of the water is 1 kg/s, what is amount of power must be provided to the pump to keep the water flowing as described?

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ME326_HW2_7Sept2011 - ME 326-Homework Assignment#2 Due 7...

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