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As part of your job at the patent office, you are asked to evaluate the six designs shown in the figure for innovative new heat engines

Physics

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As part of your job at the patent office, you are asked to evaluate the six designs shown in the figure for innovative new heat engines. (Figure 1)

Part A

Which of the designs violate(s) the first law of thermodynamics?

Give the letter(s) of the design(s) in alphabetical order, without commas or spaces (e.g., ACD).