A 10-N falling object encounters 4 N of air resistance. The net force on it is
A) 0 N.
B) 4 N.
C) 6 N.
D) 10 N.
Answer: C
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The absolute magnitude of a star is its brightness as seen from a distance of
A) one million kilometers. B) one astronomical unit. C) one light-year. D) ten parsecs. E) 10 light-years.
Stars on the main sequence with the greatest mass
a. are spectral type M stars. b. are spectral type O stars. c. are located at the bottom of the main sequence in the H-R diagram. d. have masses very similar to the Sun. e. are spectral type O stars and are located at the bottom of the main sequence in the H-R diagram.
Significant Figures: What is the sum of 1.53 + 2.786 + 3.3 expressed to the correct number of significant figures?
A. 7 B. 7.6 C. 7.62 D. 7.616 E. 7.6160
A(n) ________ represents a relatively peaceful mass loss as a red giant becomes a white dwarf
A) nova B) planetary nebula C) supernova D) emission nebula E) supernova remnant