What is the fate of an isolated brown dwarf?
A) It will become a black hole.
B) It will become a white dwarf.
C) It will slowly evaporate to nothing.
D) It will become a neutron star.
E) It will remain a brown dwarf forever.
E
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What kinds of stars are being looked at to find these hiding bandits?
A: Stars with small parallaxes B: Stars with large parallaxes C: Stars with temperatures much greater than the Sun D: Stars with radii much greater than the Sun E: Stars with radii much smaller than the Sun
The intensity of a 70-dB whistle is doubled. What is the new decibel level?
Harlow Shapley concluded that the Sun was not located at the center of the Milky Way Galaxy by
A) mapping the distribution of stars in the galaxy. B) mapping the distribution of gas clouds in the spiral arms. C) mapping the distribution of globular clusters in the galaxy. D) looking at the shape of the "milky band" across the sky. E) looking at other nearby spiral galaxies.
A straight wire (length = 8.0 m) is bent to form a square. If the wire carries a current of 20 A, what is the magnitude of the magnetic field at the center of the square?
a. 17 ?T b. 14 ?T c. 11 ?T d. 20 ?T e. 36 ?T