An aircraft that flies faster than the speed of sound is said to be
A) subsonic.
B) supersonic.
C) impossible.
D) none of the above
Answer: B
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Which of the following statements best describes the two principle advantages of telescopes over eyes?
A) Telescopes can collect far more light with far better angular resolution. B) Telescopes can collect far more light with far greater magnification. C) Telescopes collect more light and are unaffected by twinkling. D) Telescopes have much more magnification and better angular resolution.
Why do today's high tides arrive about an hour later than yesterday's tides?
A. The tidal bulges include dry land as well as water, and dry land responds to the tidal forces more slowly. B. The gravitational pull of the Sun on the tidal bulges slows their flow around Earth. C. Friction between the surface of Earth and the water slow the water's motion. D. The Moon rises and sets about an hour later every day, and the tides follow the Moon.
Which of the following descriptions shows two objects of EQUAL mass-energy?
Two stars both lie on the main sequence. Star X is spectral type A, while Star Y is spectral type G. Therefore, Star X is more massive than Star Y
Indicate whether the statement is true or false