The fission of 235U nuclei is initiated by
a. electrons.
b. protons.
c. alpha particles.
d. neutrons.
d
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The unit of inductance, the henry, is equivalent to:
a. J/C. c. V•s/A. b. V/m. d. none of the units given.
Refer to the sketch above of an H-R diagram for a star cluster. Which statement about this cluster is true?
A) It is probably located in the disk of the galaxy. B) It contains some stars that will soon undergo supernova explosions. C) It is probably located in a globular cluster. D) It is probably embedded in a molecular cloud in which new stars are being born.
A torque of 12 N ? m is applied to a solid, uniform disk of radius 0.50 m, causing the disk to accelerate at What is the mass of the disk?
A) 17 kg B) 13 kg C) 8.5 kg D) 4.3 kg
The most important fact about a cluster of stars that makes them useful for studying star formation is that
A) all the stars formed from the same cloud. B) all the stars formed at about the same time. C) all the stars are at the same distance from Earth. D) all the stars have the same chemical composition. E) all the stars are the same spectral type.