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ME320 solution1

# ME320 solution1 - ME320 Thermodynamics Homework set#1 Due...

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ME320 Thermodynamics Homework set #1 Due: Wednesday 9/10/03 at the start of class 1. A body with a mass of 5 kg is attracted to earth at a location where the gravitational acceleration is 8 m/s 2 . What is the weight of the body in Newtons? If the body moves with a velocity of 10 m/s, what is its kinetic energy? Solution: The magnitude f of the force exerted on the body to hold it in equilibrium against the action of the graviational field is equal to the weight w of the body. Thus, writing m for the mass of the body, we have w = f = mg = (5 kg)(8 m/s) = 40 kgm s = 40 N . Note that w generally varies with the local gravitational acceleration but that m does not. Finally, granted that the body is moving with velocity v = 10 m/s, its kinetic energy is 1 2 mv 2 = 1 2 (5 kg)(10 m/s) 2 = 250 kgm 2 s 2 = 250 J . 2. A bottle of water at room temperature is put into a refrigerator to cool. Would you model the bottle of water as an open or closed system?

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