Which type of main-sequence star(s) is a good candidate for searching Earth-like planets with life?
a. O and B
b. G and K
c. A and F
d. white dwarfs
e. binary stars
b
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If the distance between us and a star is doubled, with everything else remaining the same, the luminosity
A) is decreased by a factor of four, and the apparent brightness is decreased by a factor of four. B) is decreased by a factor of two, and the apparent brightness is decreased by a factor of two. C) remains the same, but the apparent brightness is decreased by a factor of two. D) remains the same, but the apparent brightness is decreased by a factor of four. E) is decreased by a factor of four, but the apparent brightness remains the same.
The superposition of identical waves affects
A) amplitude. B) wavelength. C) speed. D) all of the above E) none of the above
A meter stick is hinged at its lower end and allowed to fall from a vertical position. If its moment of inertia is ML2/3, with what angular speed does it hit the table?
a. 5.42 rad/s b. 2.71 rad/s c. 1.22 rad/s d. 7.67 rad/s
When a superconductor's temperature drops below the critical temperature, its resistance:
a. equals that of a semiconductor of equal dimensions. b. drops to zero. c. reduces to one half. d. increases by two.