Heat Engines: The figure shows a pV diagram for a cycle of a heat engine for which QH = 59 J. What is the thermal efficiency of the engine?

A. 17%
B. 34%
C. 8.5%
D. 14%


Answer: A

Physics & Space Science

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Total Internal Reflection: The speed of light in a material is 0.41 c. What is the critical angle of a light ray at the interface between the material and a vacuum?

A. 24° B. 17° C. 19° D. 22°

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The planets in the solar system

A) revolve around the Sun in the same direction B) orbit around the Sun in nearly the same plane C) have nearly circular orbits D) all of these are true

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