Identify a true statement about brown dwarfs
A) They are low-luminosity objects.
B) They are almost the same size as Mars.
C) They generate energy by hydrogen fusion.
D) They emit most of their energy in positrons.
A
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When they were first discovered, quasars appeared to be____
a. small, star-like objects associated with radio emission b. pairs of radio sources c. elliptical galaxies with an X-ray emitting halo d. clouds of gas glowing with green emission lines e. linear jets of matter
A car travels at 50.0 km/hr for 2.00 hours. It then travels an additional distance of 40.0 km in 1.00 hour. The average speed of the car for the entire trip is
A. 61.0 km/hr. B. 57.1 km/hr. C. 53.3 km/hr. D. 46.7 km/hr. E. 30.0 km/hr.
Mercury is mostly comprised of a large metallic core
a. True b. False Indicate whether the statement is true or false
A certain amount of a monatomic gas is maintained at constant volume as it is cooled by 50 K. This feat is accomplished by removing 400 J of energy from the gas. How much work is done by the gas?
A) 200 J B) -200 J C) 400 J D) zero E) -400 J