How long does it take an M-type star to reach the main sequence, compared to a solar-type star?
A) longer than the age of the Galaxy
B) about twice as long
C) a tenth as long
D) about twenty times longer
E) about the same, 30 million years
D
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An n-type semiconductor is produced by
A) pure crystals of germanium. B) doping the host crystal with donor impurities. C) doping the host crystal with acceptor impurities.
A peregrine falcon dives at a pigeon. The falcon starts with zero downward velocity and falls with the acceleration of gravity. If the pigeon is 76.0 m below the initial height of the falcon, how long does it take the falcon to intercept the pigeon?
The angular acceleration of a wheel is given in by where t is in seconds. If the wheel starts from rest at when is the next time the wheel is at rest?
A) 5.1 s B) 8.4 s C) 6.9 s D) 3.6 s
What is the mass density of argon gas at pressure 1.00 × 105 N/m2 and at temperature 300 K? The mean atomic mass of argon is 39.948u
A) 1.40 kg/m3 B) 1.00 kg/m3 C) 1.20 kg/m3 D) 1.60 kg/m3 E) 1.80 kg/m3