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

Physics & Space Science

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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.

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science

The superposition of identical waves affects

A) amplitude. B) wavelength. C) speed. D) all of the above E) none of the above

Physics & Space Science