A common car engine is 20% efficient. When cruising, the car encounters an average retarding force of 1000 N. If the energy content of gasoline is 40 MJ/L, how many kilometers per liter does the car achieve?
A) 14 km/L
B) 12 km/L
C) 10 km/L
D) 8 km/L
E) none of the above
Answer: D
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A large luminosity star
a) is always at a larger distance than a small luminosity star b) emits more light than a low luminosity star c) is always redder than a star with a small luminosity d) is at a lower temperature than a small luminosity star e) is always at a smaller distance than a small luminosity star
Detailed measurements of the disk and central bulge region of our Galaxy suggest our Milky Way is a
A) dwarf galaxy. B) spiral galaxy. C) very flat elliptical galaxy. D) very dusty irregular galaxy. E) quasar.
What property do greenhouse gases have that allow them to warm a planet?
What will be an ideal response?