When strong solar winds are directed poleward, we see ________ at night
Fill in the blank(s) with correct word
aurorae
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A star's apparent magnitude is a measure of
a. how bright it appears to us if it is at its actual distance. b. how bright it appears to us at a standard distance of 10 pc. c. its energy output per second compared to the Sun. d. its mass in solar masses. e. its surface temperature in Kelvin.
A 51.8-kg bungee jumper jumps off a bridge and undergoes simple harmonic motion. If the period of oscillation is 11.2 s, what is the spring constant (force constant) of the bungee cord?
A) 16.3 N/m B) 19.6 N/m C) 26.1 N/m
An object moving in simple harmonic motion has an amplitude of 0.020 m and a maximum acceleration of 20 m/s2 . What is the frequency of the system?
a. 0.40 Hz c. 10.1 Hz b. 5.0 Hz d. 32 Hz
If the Universe is closed and finite, then
a. the Universe will expand forever. b. the Universe has a center. c. the Universe has an edge. d. None of the other choices are correct.