The sky is blue because air molecules in the sky act as tiny
A) mirrors which reflect only blue light.
B) optical tuning forks that scatter blue light.
C) sources of white light.
D) prisms.
E) none of the above
Answer: B
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The relation between the Doppler shift of galaxies and their distances is called
A) the cosmological principle. B) Hubble's law. C) special relativity. D) Olbers's paradox. E) general gelativity.
A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s, during which time she is swept downstream 480 m
(a) How fast can she swim in still water? (b) What is the speed of the current?
Resistor A has twice the resistance of resistor B. When individually connected across a given potential difference, which one dissipates the most power; and when connected in series across the same potential difference, which one dissipates the most power?
a. A, A b. A, B c. B, B d. B, A
The nadir marks the point of the celestial sphere directly above your head
a. True b. False Indicate whether the statement is true or false