# Engenharia

Páginas: 4 (909 palavras) Publicado: 18 de novembro de 2012
Lista de Exercícios de termodinâmica
1. An escalator brings four people of total 300 kg, 25 m up in a building. Explain what happens with respect to energy transfer and stored e energy.
2. Asteel cylinder of mass 2 kg contains 4 L of liquid water at 25oC at 200 kPa. Find the total mass and volume of the system. List two extensive and three intensive properties of the water.
3. An apple“weighs” 80 g and has a volume of 100 cm3 in a refrigerator at 8oC. What is the apple density? List three intensive and two extensive properties of the apple.
4. One kilopond (1 kp) is the weight of1 kg in the standard gravitational field. How many Newtons (N) is that?
5. A pressurized steel bottle is charged with 5 kg of oxygen gas and 7 kg of nitrogen gas. How many kmoles are in thebottle?
6. A force of 125 N is applied to a mass of 12 kg in addition to the standard gravitation. If the direction of the force is vertical up find the acceleration of the mass.
7. A car drives at 60km/h and is brought to a full stop with constant deceleration in 5 seconds. If the total car and driver mass is 1075 kg find the necessary force.
8. A 15 kg steel container has 1.75 kilomoles ofliquid propane inside. A force of 2 kN now accelerates this system. What is the acceleration?
9. A tank has two rooms separated by a membrane. Room A has 1 kg air and volume 0.5 m3, room B has 0.75m3 air with density 0.8 kg/m3. The membrane is broken and the air comes to a uniform state. Find the final density of the air.
10. One kilogram of diatomic oxygen (O2 molecular weight 32) iscontained in a 500-L tank. Find the specific volume on both a mass and mole basis (v and v).
11. A hydraulic lift has a maximum fluid pressure of 500 kPa. What should the piston-cylinder diameter be so itcan lift a mass of 850 kg?
12. What is the pressure at the bottom of a 5 m tall column of fluid with atmospheric pressure 101 kPa on the top surface if the fluid is
a) water at...

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