A star is observed with a surface temperature of 3,000 K and a lumi nosity of 105 solar. What is the approximate radius of this star?
A) 10 solar radii B) 103 solar radii
C) 102 solar radii D) The radius cannot be determined.
B
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You live at a latitude of 39° S. What is the angle between the southern horizon and the south celestial pole?
a. 45° b. 23.4° c. 39° d. 51° e. The answer depends on the day of the year.
Stars like the Sun probably do not form iron cores during their evolution because
A. the iron they make by nucleosynthesis is all fused into uranium. B. their strong magnetic fields keep their iron in their atmospheres. C. all the iron is ejected when they become planetary nebulas. D. their cores never get hot enough for them to make iron by nucleosynthesis. E. None of these choices is correct.
How many medium-sized moons does Saturn have?
A) Too many to count B) 18 C) 9 D) 6 E) 1
An automobile driver puts on the brakes and decelerates from 35.0 m/s to zero in 11.0 s. What distance does the car travel?
a. 193 m b. 97 m c. 241 m d. 290 m e. 145 m