What is the maximum theoretical effectiveness of the plant

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Q1. An electrical generating plant operates at the boiler temperature of and exhausts the unused heat into a nearby river at. What is the maximum theoretical effectiveness of the plant?

Q2. An elastic cord is 66 cm long when a weight of 66 N hangs from it but is 86 cm long when a weight of 76 N hangs from it. What is the "spring" constant k of the elastic cord?

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