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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Some double-pane airplane windows darken when the inner pane is rotated. The panes are
A) thin films. B) Polaroid filters. C) optical fibers.
Physics & Space Science
Eukaryotes
A) are made of two cells fused together B) are all unicellular C) can be unicellular or multicellular D) are all multicellular
Physics & Space Science
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°
Physics & Space Science
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
Physics & Space Science