In Fig. 12.19, the plunger of a syringe is pushed in quickly, and the small pieces of paper in the syringe catch fire. Explain this phenomenon using the first law of thermodynamics. (Similarly, in a diesel engine, there are no spark plugs. How can the air– fuel mixture ignite?)
Answer to relevant QuestionsIn an isobaric process, an ideal gas sample can do work on the environment but its temperature also increases. How can this be? A gas is enclosed in a cylindrical piston with a 12.0-cm radius. Heat is slowly added to the gas while the pressure is maintained at 1.00 atm. During the process, the piston moves 6.00 cm. (a) This is an (1) isothermal, (2) ...What is the change in entropy of mercury vapor (Lv = 2.7 x 105 J/kg) when 0.50 kg of it condenses to a liquid at its boiling point of 357 oC? In the winter, heat from a house with an inside temperature of 18 oC leaks out at a rate of 2.0 x 104 J. The out-side temperature is 0 oC. (a) What is the change in entropy per second of the house? (b) What is the total ...A heat engine with a thermal efficiency of does 500 J of net work each cycle. How much heat per cycle is lost to the low-temperature reservoir?
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