Which of the following statements is true of stars?
A) They are highly unbalanced.
B) They are held together by their own gravity.
C) They do not have their own source of energy.
D) They defy the law of conservation of mass.
B
You might also like to view...
What physical feature of our planet is most dependent on supernova events?
a. oceans of water b. a breathable atmosphere c. organic chemicals d. uranium in Earth's interior e. a nickel-iron core
Venus is visible to us:
a) only during its new phase. b) only near sunrise or sunset. c) only in the summer. d) only in the winter. e) only during the several hours around midnight.
The Sun's blackbody curve peaks in the ________ portion of the spectrum
A) radio B) visible C) ultraviolet D) X-ray E) infrared
A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the fundamental frequency?
a. 316 Hz b. 632 Hz c. 158 Hz d. 215 Hz e. 79 Hz