What is the acceleration of a scooter that maintains a constant velocity of 15 m/s for 10 s?
A) 0 m/s2
B) 0.15 m/s2
C) 1.5 m/s2
D) 15 m/s2
Answer: A
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Using an orbit size of 8 kpc, and a period of 225 million years, the mass of our Galaxy is found to be closest to
A) 106 solar masses. B) 108 solar masses. C) 1010 solar masses. D) 1011 solar masses. E) 1012 solar masses.
If a ray of light passes from air into glass, the angle of incidence will be
a. less than the angle of refraction. b. sometimes greater and sometimes less than the angle of refraction. c. greater than the angle of refraction. d. equal to the angle of refraction.
Why do comet's tails always point away from the Sun?
A) because of solar wind B) because the inner planets cause the ice and other volatile materials to be pulled towards their orbits C) because of the comet's interaction with dark matter D) because when they move away from the Sun they begin to lose inertia
Refer to the figure above. What can you conclude from the data shown on this graph alone?
A) The carbon dioxide concentration varies naturally, but is much higher today than it has been in the past 800,000 years. B) Human activity has caused the carbon dioxide concentration to rise and fall many times in the past 800,000 years. C) Changes in the carbon dioxide concentration are the causes of ice ages. D) If current trends continue, carbon dioxide will soon be the most abundant gas in Earth's atmosphere.