A source emits sound at a fixed constant frequency f.If the source moves away from you faster than the speed of sound in air, the frequency that you hear is
a. the same as f. b. higher than f.
c. lower than f. d. unrelated to f.
d
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The cosmological principle states that any observer in any galaxy will see the same general features of the universe
Indicate whether the statement is true or false
What three main observed phenomena are the strongest support for the "big bang" theory?
What will be an ideal response?
If the Sun were replaced by a one solar mass black hole:
A) all terrestrial planets would fall in immediately. B) we would still orbit it in a period of one year. C) we would immediately escape into deep space, driven out by its radiation. D) our clocks would all stop. E) life here would be unchanged.
How much heat (in kcal) must be removed to make ice at ?10°C from 2 kg of water at 20°C? (The specific heat of ice is 0.50 cal/g/°C.)
a. 190 b. 200 c. 240 d. 210 e. 50