Suppose two charges, one positive and one negative, are separated by a distance d. Where can two equipotential surfaces at different potentials intersect in the region near the charges?
a. halfway between the charges if the charges have the same magnitude
b. closer to the smaller negative charge than the larger positive charge if the charges are not equal
c. Equipotential surfaces at different potentials cannot intersect.
d. closer to the smaller positive charge than the larger negative charge if the charges are not equal
C
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An iron core cannot support a star because
A) iron is the heaviest element, and sinks upon differentiation. B) iron cannot fuse with other nuclei to produce energy. C) iron is in the form of a gas, not a solid, in the center of a star. D) iron supplies too much pressure. E) iron has poor nuclear binding energy.
We observe that most galaxies are moving away from us. If we could (somehow) communicate with an observer in a distant galaxy, what would that observer say about what it sees?
A) Most galaxies are moving away from me, except for yours. B) Most galaxies are moving away from me, including yours. C) Most galaxies are moving away from you, and about half are moving towards me.
A car starts out when the air temperature is 288 K. The air pressure in the tires is 460 kPa. After driving a while, the temperature of the air in the tires increases to 298 K
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Simple Pendulum: Grandfather clocks are designed so they can be adjusted by moving the weight at the bottom of the pendulum up or down. Suppose you have a grandfather clock at home that runs slow. Which of the following adjustments of the weight would make it more accurate? (There could be more than one correct choice.)
A. Raise the weight. B. Lower the weight. C. Add more mass to the weight. D. Remove some mass from the weight. E. Increase the amplitude of swing by a small amount.