While playing in a tennis match, you lost 6.5 x 105 of heat, and your internal energy also decreased by 1.2 x 106J. How much work did you do in the match?
Answer to relevant QuestionsA fixed quantity of gas undergoes the reversible changes illustrated in the p–V diagram in Fig. 12.22. How much work is done in each process? An ideal gas sample expands isothermally by tripling its volume and doing 5.0 x 104J of work at 40 oC. (a) How many moles of gas are there in the sample? (b) Was heat added to or removed from the sample, and how much? A process involves 1.0 kg of steam condensing to water at 100 oC. (a) The change in entropy of the steam (water) is (1) positive, (2) zero, (3) negative. Why? (b) What is the change in entropy of the steam (water)? A system goes from state 1 to state 3 as shown on the T–S diagram in Fig. 12.25. (a) The heat transfer for the process going from state 2 to state 3 is (1) positive, (2) zero, (3) negative. Explain. (b) Calculate the ...A gasoline engine burns fuel that releases 3.3 x 108 J of heat per hour. (a) What is the energy input during a 2.0-h period? (b) If the engine delivers 25 kW of power during this time, what is its thermal efficiency?
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