A gasoline engine absorbs 2 500 J of heat and performs 1 000 J of mechanical work in each cycle. The efficiency of the engine is
a. 80%
b. 40%
c. 60%
d. 20%
e. 50%
b
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Galileo found the rotation period of the Sun was approximately:
A) a day. B) a week. C) a month. D) three months. E) a year.
A bow wave is produced when a wave source moves
A) nearly as fast as the waves it produces. B) as fast as the waves it produces. C) faster than the waves it produces.
James moves in a circular path (radius 15.0 m) with a speed of 60.0 m/s. His ANGULAR VELOCITY is
A) 120/? rpm. B) 120 radians/s. C) 120. rev/s. D) 120? radians/s. E) 120/? radians/s.
Where did the molecular oxygen in Earth's atmosphere come from?
A) photosynthesis by living organisms B) the breakdown of water molecules by sunlight C) outgassing from volcanoes D) evaporation from the oceans E) chemical reactions with surface rocks