Carnot Engine: An inventor tries to sell you his new heat engine that takes in 40 J of heat at 87°C on each cycle, expels 30 J at 27°C, and does 10 J of work. Would it be wise to invest in this engine? Back up your conclusion with numerical calculations.
What will be an ideal response?
Save your money! He has claimed an efficiency of 25%, but the greatest possible efficiency for an engine operating between these temperatures is only 17%, for a Carnot engine.
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A. Use white light B. Use 2 converging lenses C. Use a converging lens and a diverging lens D. Only allow light to go through the center of the lens
Two lenses, the first with focal length 10.0 cm and the second with focal length -12.5 cm, are separated by 20.0 cm. An object, 2.40 cm tall, is 15.0 cm in front of the first lens. What is the size of the final image?
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