After the hydrogen in the star's core is depleted, the core
A. shrinks and heats up.
B. shrinks and cools down.
C. expands and heats up.
D. expands and cools down.
Answer: A
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As the Sun rotates, an individual sunspot can be tracked across its face. From eastern to western limb, this takes about
A) 12 hours. B) a week. C) two weeks. D) a month. E) 5.5 years.
A positively charged particle has a velocity in the negative z direction at point P. The magnetic force on the particle at this point is in the negative y direction. Which one of the following statements about the magnetic field at point P can be determined from this data?
A. Bx is positive. B. Bz is positive. C. By is negative. D. By is positive. E. Bx is negative.
The equators of all four jovian planets rotate more rapidly than the polar regions
Indicate whether the statement is true or false
The SI unit of electric charge is
a. e, the charge on the electron. b. the coulomb. c. the ampere. d. the ohm. e. the volt.