O and B stars only occur in the galactic _______________
Fill in the blank(s) with correct word
disk
disc
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The above image of the Sun was taken using a filtergram
a. True
b. False
A cook plugs a 500 W crockpot and a 1 000 W kettle into a 240 V power supply, all operating on direct current. When we compare the two, we find that
a. Icrockpot < Ikettle and Rcrockpot < Rkettle. b. Icrockpot < Ikettle and Rcrockpot > Rkettle. c. Icrockpot = Ikettle and Rcrockpot = Rkettle. d. Icrockpot > Ikettle and Rcrockpot < Rkettle. e. Icrockpot > Ikettle and Rcrockpot > Rkettle.
You have available lenses of focal lengths 2.0 cm, 4.0 cm, 8.0 cm, and 16.0 cm. If you could use any two of these lenses to build a telescope, what is the maximum magnification you could achieve for comfortable viewing of a planet?
A) 2.0 B) 4.0 C) 6.0 D) 8.0
Acceleration is greater for a satellite when it is at the
A) apogee (farthest point). B) perigee (closest point). C) zenith. D) same acceleration at all of the above places.