The Moon does not fall to Earth because
1) the net force on it is zero.
2) it is being pulled by the sun and planets as well as Earth.
3) it is beyond the main pull of Earth's gravity.
4) but it does fall!
More specifically, the Moon
5) is subject to both centripetal and centrifugal forces.
6) interacts with all massive bodies, both near and far.
7) is free of air resistance as well as other Earthly influences.
8) continually falls around Earth rather than straight into it.
Answer: 4, 8
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The measured value of the speed of light is about 300,000 km/s. Suppose a futuristic space train is traveling at 200,000 km/s with its headlights on. If you could measure the speed of the light from the headlights, you would find it to be
A) 200,000 km/s. B) 100,000 km/s. C) 300,000 km/s. D) 500,000 km/s.
While featureless in visible light, we can see some detail in Venus' clouds using
A) radio waves. B) ultraviolet light. C) X-rays. D) infrared radiation. E) gamma rays.
In an interference pattern, the wavelength and frequency are
a. the same in both the regions of constructive interference and the regions of destructive interference. b. greater in regions of constructive interference than in regions of destructive interference. c. smaller in regions of constructive interference than in regions of destructive interference. d. unchanged in regions of destructive interference but greater in regions of constructive interference. e. unchanged in regions of destructive interference but smaller in regions of constructive interference.
Drinking alcohol is required to be radioactive because
A. it proves that it is not made of petroleum B. it is healthier C. it shows that the alcohol was "aged" D. It is not required; just the opposite, alcohol for consumption must not be radioactive.