W2-3 Q1: The figure shows the two processes on the P- V diagram. If the ratio \W1-2 57. and the total work (W1-3 = 485 J) . Also (V2 = 20V, ,V3 =V2). Then, the pressure and volume at point 1 (P, and V1) are P(N/m²) P: P1 V(m') V3 VI V2

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4. A typical coal-fired power plant operates with a high-temperature reservoir at Th = 800 K and a low-temperature reservoir at Tc = 300 K. What is the maximum efficiency allowed by the 2nd law of thermodynamics (the Carnot efficiency) for a heat engine operating between these temperatures?  Give your answer as a decimal number, not as a percentage. (This isn't in section 4.2, so you might want to also take a quick look at equation 4.5 in section 4.5 of the textbook, or at the introductory material in this week's lab write-up.)

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For the heat pump (used for heating) illustrated below, what is its coefficient of performance for heating. Ag? The gas is monatomic. p(Pa) 6 A. 8/3 B. 2 C. 11/3 D. 14/3 E. 19/7 2 V(m³) 34

- What is the work done on the gas as it expands from ressure P₁ and volume V₁ to pressure P2 and volume V2 long the indicated straight line? a. (P₁-P2) (V₁-V₂)/2 c. (P₁ + P2)(V₁-V2)/2 b. (P₁+P2) (V₁-V2) d. (P₁ P2)(V1 + V2) P₂ P₁ V₁ V₂ 2 V

An ideal gas has undergoes two process AB and BC as shown in the figure below. 8 kJ of heat is supplied to the process AB and 4 kJ of heat is dissipated from the gas in the process BC. P (×10') Pa) A в V (m³) 0.02 0.04 Calculate a. the work done for AB and BC b. the changes in internal energy for ABC. 3.

QUESTION 16 The temperature at state A is 20.0°C, that is 293 K. During the last test, you have found the temperature at state D is 73.0 K and n = 164 moles for this monatomic ideal gas. What is the change in thermal energy for process A to D, in MJ (MegaJoules)? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. p (atm) 5 4 3 2 1 0 A D 1 2 3 4 B 5 → V (m³)

A Carnot heat engine operates between thermal reservoirs at Th and Tc. What is the theoretical efficiency, η, of this engine? -Part (a)  Write an expression for thermal efficiency, η.  - Part (b)  Solve numerically for the thermal efficiency, η, assuming that Th = 820°C and Tc = 440°C.

A gas expands from I to F in the figure below. The energy added to the gas by heat is 302 J when the gas goes from I to Falong the diagonal path. Three paths are plotted on a PV diagram, which has a horizontal axis labeled V(liters), and a vertical axis labeled P (atm). The green path starts at point I (2,4), extends vertically down to point B(2,1), then extends horizontally to point F (4,1). The blue path starts at point I (2,4), and extends down and to the right to end at point F (4,1). The orange path starts at point I(2,4), extends horizontally to the right to point A (4,4), then extends vertically down to end at point F(4,1). (a) What is the change in internal energy of the gas?J(b) How much energy must be added to the gas by heat for the indirect path IAF to give the same change in internal energy?J