Why are star clusters almost ideal "laboratories" for stellar studies?
A) All stars in the cluster are the same size and luminosity.
B) Their combined light makes them much easier to spot from a distance.
C) Stars in clusters have the same age, similar composition, and are at the same distance away.
D) Stars in clusters are all relatively young and therefore shine brightly.
E) Like our Sun, stars in clusters are always located in the plane of the Milky Way Galaxy.
C
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Processed meteorites with high metal content probably are
A) leftover chunks of rock from the earliest period in the formation of the solar system. B) pieces of comets rather than of asteroids. C) chunks of rock chipped off the planet Mars. D) chunks of rock chipped off the planet Mercury. E) chunks of the core of a larger asteroid that was shattered by a collision.
In 1846, Johann Galle found Neptune:
A) a few degrees from where it was predicted to be. B) after many years of searching for it. C) exactly where he predicted it would be. D) using just a pair of binoculars. E) using grossly inaccurate star charts.
A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 ? and C = 300 ?F. The impedance is
a. 4.68 ?. b. 8.84 ?. c. 10.0 ?. d. 13.4 ?. e. 18.8 ?.
Which of the following statements is true?
a. A hot object contains a lot of heat. c. Objects do not contain heat. b. A cold object contains only a little heat. d. Statements a and b are true.