On the H-R diagram our Sun is a
A) white dwarf.
B) star of average luminosity and temperature.
C) red supergiant.
D) relatively bright, blue star.
Answer: B
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Earth and the moon could not have condensed from the same materials because they have different densities and compositions
Indicate whether the statement is true or false
Parallel Wires: When two long parallel wires carry unequal currents, the magnitude of the magnetic force that one wire exerts on the other is F. If the current in both wires is now doubled, what is the magnitude of the new magnetic force on each wire?
A. 16F
B. 8F
C. 4F
D. 2F
E. F
Aberration: Spherical lenses suffer from
A. both spherical and chromatic aberration. B. spherical aberration, but not chromatic aberration. C. chromatic aberration, but not spherical aberration. D. neither spherical nor chromatic aberration.
If the length of a box is reduced by one-third and the width and height are doubled, by what factor has the volume changed?
A. 4/3 B. 2/3 C. 3/4 D. 3/2