The speeds of the planets about the Sun depend on
A) their distances from the Sun.
B) the masses of the planets.
C) both of these
D) none of the above
Answer: A
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In order to have a global magnetic field, a planet must have
A) an electrically conducting fluid in its interior which is undergoing convection and a reasonably rapid rotation B) magnetic rocks in its interior C) magnetic rocks on its surface D) a large core of solid magnetized iron
A dielectric is inserted between the plates of an isolated parallel-plate capacitor that carries a charge Q. What happens to the potential energy stored in the capacitor?
A) The potential energy of the capacitor decreases. B) The potential energy of the capacitor increases or decreases depending on the value of the dielectric constant of the capacitor. C) The potential energy of the capacitor remains the same. D) The potential energy of the capacitor increases. E) More information is needed to answer the question.
Resolution: The pupil of a person's eye changes from a diameter of 3.5 mm to 1.5 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
A. 0.43 B. 0.65 C. 2.0 D. 2.3
The purpose of prescription glasses for a near-sighted person is to bring the apparent positions of distant objects
A. to the far point of the eye. B. to the near point of the eye. C. to the retina of the eye. D. none of the above.