You are now operating a carnot engine at 40% efficiency, which exhausts heat into a heat sink at 298 k. if you want to increase the efficiency of the engine to 65%, to what temperature would you have to raisethe hot reservoir?

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There is no graph to look at on here, but i shall explain them to you. a line graph is just in its title it’s a graph with a line running through the dots to show an increase or decrease. a bar graph is used to show how much or how little something is so a comparison. a scatter plot is used to graph points to tell the data. and i don’t know what a histogram is.

Hypothesis. why don’t you know this? i learned this stuff in like 5th grade