LL3 [Heat Engine Efficiency and Phase Change Calculations]

Open Ended

Please share one question you have about the content we are covering in this unit

and

one thing you are looking forward to right now, school related or unrelated as long as it's school appropriate

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Calculate the amount of energy required to change 25g of -45ºC ice to 0ºC ice. Make sure to use proper units. You should omit commas but include the unit.

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Calculate the amount of energy required to change 25g of -45ºC ice to 0ºC liquid water. Make sure to use proper units. You should omit commas but include the unit.

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Calculate the amount of energy required to change 25g of -45ºC ice to 40ºC liquid water. Make sure to use proper units. You should omit commas but include the unit.

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If there are 1,300J of thermal energy in the heat resevoir (Q_H), and the heat engine does 530J of work (W), then what is the efficiency of the heat engine? Be sure to round properly.

%

Open Ended

An inventor is applying for a patent. They claim their new heat engine can produce 1,200J of work for every 1,800J of heat applied to it.

Solve for η using the proper equation and units. Does this claim seem realistic for a heat engine? Why or why not?

Helpful Links

Agenda Slide

Enthalpy of Fusion and Vaporization Video

Calculating Heat Engine Efficiency Video

Open Ended

Please share either one thing you learned from today's lesson, or one question you still have about the content we are covering. Thank you!