Heat Engines Practice
Flashcard
•
Physics
•
9th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the thermal efficiency range of a petrol engine?
Back
20% - 30%
2.
FLASHCARD QUESTION
Front
If 750J of heat is added to an isolated gas and it does 230J of work, what is the change in thermal energy?
Back
520 J
3.
FLASHCARD QUESTION
Front
A heat engine does 220J of work when receiving 600J of heat. How much energy is emitted through the exhaust?
Back
380 J
4.
FLASHCARD QUESTION
Front
In energy transformations, what form does 'wasted energy' usually take?
Back
heat
5.
FLASHCARD QUESTION
Front
How efficient is a washing machine that uses 250J of electrical energy to produce 125J of useful energy?
Back
50%
6.
FLASHCARD QUESTION
Front
Define thermal efficiency.
Back
Thermal efficiency is the ratio of useful work output to the total heat input, expressed as a percentage.
7.
FLASHCARD QUESTION
Front
What is the formula for calculating thermal efficiency?
Back
Thermal Efficiency (%) = (Useful Work Output / Total Heat Input) x 100
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