How does a red giant compare to a main-sequence star of the same mass?
A) The red giant has higher surface temperature and higher luminosity.
B) The red giant has higher luminosity but lower surface temperature.
C) The red giant has lower surface temperature and lower luminosity.
D) The red giant lower luminosity but higher surface temperature.
E) Both stars have the same mass and therefore have the same surface temperature and luminosity.
B) The red giant has higher luminosity but lower surface temperature.
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The gas in a perfectly insulated system does work at a rate of At what rate is the internal (thermal) energy of the gas changing?
A) -13 W B) 13 W C) 0.00 W D) 6.5 W
The point in time at which oxygen started to build up in the Earth's atmosphere is referred to as the
A) great oxidation event B) great oxygen crisis C) great oxygenation event D) great photosynthetic event
What is the reason that glass is less of an energy saver than steel or aluminum if it is recycled? Explain your reasons for your answer
What will be an ideal response?
A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 22.0 cm from the mirror, what is its focal length?
a. 44.0 cm c. 18.6 cm b. 48.3 cm d. 56.0 cm