What is the greatest mass a newborn star can have
A) 10 solar masses.
B) 20 solar masses.
C) 50 solar masses.
D) a few hundred solar masses.
D
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Which of the following is true of the star clusters in the Milky Way?
A) Open clusters are widely scattered in the Milky Way. B) Globular clusters are concentrated along the disk of the Milky Way. C) Open clusters are more common toward the constellation Sagittarius. D) Globular clusters are much too far away to have measureable parallaxes.
A cube at 100°C radiates heat at a rate of 80.0 J/s. If its surface temperature is increased to 200°C, the rate at which it will now radiate is closest to
A) 160 J/s. B) 207 J/s. C) 320 J/s. D) 640 J/s. E) 1280 J/s.
If an atom has become a positive ion, it has
A) gained an electron or electrons. B) lost an electron or electrons. C) gained a proton or protons. D) gained a proton and an electron. E) lost a proton or protons.
A bus is designed to draw its power from a rotating flywheel that is brought up to its maximum speed (3000 rpm) by an electric motor. The flywheel is a solid cylinder of mass 250 kg and radius 0.500 m (Icylinder = MR2/2). If the bus requires an average power of 10.0 kW, how long will the flywheel rotate?
a. 154 s c. 463 s b. 308 s d. 617 s