Q5. (20 marks) Fig. 1 displays a closed cycle for a gas. From B
to C, 40 J is transferred to the gas as heat. From C to A, 130 J is
transferred from the gas as heat, and the magnitude of the work
done by the gas is 80 J. From A to B, 400 J is transferred to the
gas as heat.
a) Supply the plus and minus signs for the given data and
explain.
Q5 20 Marks Fig 1 Displays A Closed Cycle For A Gas From B To C 40 J Is Transferred To The Gas As Heat From C To 1 (111.38 KiB) Viewed 51 times
b) If the cylinder is stretched until its radius is r2 = 1.5 cm, its net thermal radiation transfer rate becomes P2. What is the ratio P2/P/? Q4. (20 marks) A 500 g hot tea is at a temperature 100°C. Some ice at -10°C is added to cool it. Neglect energy transfers with the environment. The heat of fusion of water is 333 kJ/kg and the specific heats of ice and water are 2220 J/kg.K and 4187 J/kg.K, respectively. a) How much ice should be added to cool it to 40°C? b) If a 40 g ice is added, what is the equilibrium temperature? Q5. (20 marks) Fig. 1 displays a closed cycle for a gas. From B to C, 40 J is transferred to the gas as heat. From C to A, 130 J is transferred from the gas as heat, and the magnitude of the work done by the gas is 80 J. From A to B, 400 Jis transferred to the gas as heat. B a) Supply the plus and minus signs for the given data and explain. V b) Compute the work done by the gas from A to B. Fig. 1 р C А 10 - END- 6 NOV W 10 7,517
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