# hw_1 - Temple University Dept of Mechanical Engineering...

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Temple University Fall 2008 Dept. of Mechanical Engineering ET 3532/ ENGR 3571 Thermodynamics HOMEWORK 1 Chapter 1 1. You dive 5 m down in the ocean. What is the absolute pressure there? 2. A laboratory room keeps a vacuum of 0.1 kPa. What net force does that put on the door of size 2 m by 1 m? 3. A pressurized steel bottle is charged with 5 kg of oxygen gas and 7 kg of nitrogen gas. How many kmoles are in the bottle? 4. A 1200‐kg car moving at 20 km/h is accelerated at a constant rate of 4 m/s 2 up to a speed of 75 km/h. What are the force and total time required? 5. A 2.5 m tall steel cylinder has a cross sectional area of 1.5 m 2 . At the bottom with a height of 0.5 m is liquid water on top of which is a 1 m high layer of gasoline. The gasoline surface is exposed to atmospheric air at 101 kPa. What is the highest pressure in the water? Chapter 3 6. If I have 1 L ammonia at room pressure and temperature (100 kPa, 20 o C) how much mass is that?

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