Impulse is a quantity that is equal to force multiplied by time. If the dimensions of force are [M][L][T-2], what are the dimensions of impulse?
A)
[M][L][T-3]
B)
[M][L2][T]
C)
[M][L2][T-2]
D)
[M][L][T-1]
E)
[M][L]
D
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Which of the following is true of the Sun?
A) It is a self-luminous body of hot gas. B) It is the first planet of the Solar System. C) It shines by reflecting light from the Moon. D) It is the biggest star in the Universe.
If I fire a cannonball from the top of a mountain, traveling parallel to the Earth's surface at 14,000 miles per hour (6.26km/s), it travels a great distance before falling to Earth. If instead, I fire it at 16,000 miles per hour (7.15km/s) it:
A) travels completely around the Earth before returning to the mountaintop B) drops to Earth immediately C) travels the whole way to the Moon, orbits it once, then comes back D) travels a much smaller distance before falling to Earth E) travels exactly the same distance before falling to Earth
The planet Neptune is, on average, about 4.5 billion km from the sun. How long does it take light from the sun to reach Neptune? (Recall that the speed of light is about 300,000 km/s)
A) about 4 days B) about 4 hours C) about 4 seconds D) about 4 minutes
Which of the following statements about the moons of the jovian planets is not true?
A) Some of the moons are big enough that we'd call them planets (or dwarf planets) if they orbited the Sun. B) One of the moons has a thick atmosphere. C) Many of the moons are made largely of ices. D) Most of the moons are large enough to be spherical in shape, but a few have the more potato-like shapes of asteroids.