Relative distribution of charge density on the surface of a conducting solid depends on the
a. shape of the conductor.
b. mass density of the conductor.
c. type of metal of which the conductor is made.
d. strength of the earth's gravitational field.
a
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Conversion of Units: The radius of the earth is 3963 mi. Which one of the following numbers is closest to the surface area of the earth? (1.0 mi = 1609 m)
A. 4.9 × 107 m2 B. 1.3 × 1014 m2 C. 2.6 × 1014 m2 D. 5.1 × 1014 m2
Which of the following correctly lists two key pieces of evidence that, together, indicate that we should expect human activity to cause global warming?
A) (1) Carbon dioxide tends to make planets warmer than they would be otherwise. (2) Measurements demonstrate that human activity is raising the carbon dioxide concentration in the atmosphere. B) (1) The carbon dioxide cycle regulates Earth's climate. (2) Human activity has disrupted the carbon dioxide cycle. C) (1) The burning of fossil fuels is a form of human activity. (2) Human activity is always bad for the environment. D) (1) We can learn about past climate from ice cores. (2) Ice cores show that Earth naturally has cooler and warmer periods.
The phenomenon easily explained only in terms of the particle model of light is
A) reflection. B) refraction. C) photoelectric effect. D) diffraction. E) none of the above
If you drove day and night without stopping for one year without exceeding the legal highway speed limit in the United States, the maximum number of miles you could drive would be closest to:
a. 8 700. b. 300 000. c. 500 000. d. 1 000 000. e. 32 000 000.