Heat Engines: A heat engine receives 7000 J of heat and loses 3000 J in each cycle. What is the efficiency of this engine?
A. 57%
B. 30%
C. 70%
D. 43%
Answer: A
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Consider a planet orbiting a Sun-like star that has been detected by the Doppler and that has an orbital period of one year. The larger the velocity changes measured for the star, the
A) larger the mass of the planet. B) larger the radius of the planet. C) smaller the mass of the planet. D) smaller the radius of the planet.
Give an example in which thermal energy might be converted to gravitational energy
What will be an ideal response?
What does "IR" stand for?
a. ultraviolet b. muon neutrino c. high frequency d. infrared
California is ranked high both in total renewable energy (#2) and in renewable energy not including hydroelectricity (#1).( Why should there be any difference between these two at all? Explain using specific examples to illustrate your points
What will be an ideal response?