From its orbit, we now recognize Pluto as one of the largest members of the
A) moons of Neptune.
B) asteroid belt.
C) Kuiper Belt.
D) Oort Cloud.
E) Zodiacal Belt.
C
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Other planetary systems are best detected by the Doppler shifts that change the pattern of the star's
a. spectrum. b. brightness. c. rotational period. d. twinkling.
A grinding wheel is spinning at a rate of 20.0 revolutions per second. When the power to the grinder is turned off, the grinding wheel slows with constant angular acceleration and takes 80.0 s to come to a rest
(a) What was the angular acceleration of the grinding wheel as it came to rest? (b) How many rotations did the wheel make during the time it was coming to rest?
The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of 44.0 g/mole, is 396 m/s. What is the rms speed of water vapor molecules, with a molecular weight of 18.0 g/mol, at the same temperature as the carbon dioxide?
A) 253 m/s B) 387 m/s C) 421 m/s D) 506 m/s E) 619 m/s
A star's spectral type can be used to determine its
A) mass. B) surface temperature. C) luminosity. D) core temperature. E) radius.