Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude F due to the other
With time, charge gradually leaks off of both spheres. When each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be
A) 1/4 F. B) 1/8 F. C) 1/2 F. D) 1/16 F.
A
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Applications to Astronomy: About 1 ?s after the Big Bang, the temperature of the universe was about 1013 K. What particle kinetic energy (in eV) does this correspond to? (1 eV = 1.60 × 10-19 J, k = 1.38 × 10-23 J/K)
A. 1 keV B. 1 MeV C. 1 GeV D. 1 TeV
This diagram shows the approximate depths to which different wavelengths of light penetrate Earth's atmosphere. Why does it show an airplane?
A) Much of the infrared spectrum can be observed from an airplane that flies above most clouds. B) Airplanes are useful for astronomical observations at all wavelengths of light that do not reach the ground. C) Telescopes on airplanes are better than telescopes on the ground for both visible-light and infrared observations. D) The airplane is just decorative, indicating that astronomers use airplanes to fly to ground-based observatories.
A car is rounding the top, or crest, of a hill while moving at a steady 50 km/hr. What can you say about this car's acceleration, and why?
A) The car is not accelerated, because neither its direction of motion nor its speed are changing. B) The car is accelerated, because its speed is changing. C) The car is not accelerated, because its speed is not changing. D) The car is not accelerated, because its direction of motion is not changing. E) The car is accelerated, because its direction of motion is changing.
Two moles of an ideal gas are placed in a container of adjustable volume. When measurements are made
a. the pressure is inversely proportional to the volume at constant temperature. b. the temperature is directly proportional to the volume at constant pressure. c. the temperature is directly proportional to the pressure at constant volume. d. all the statements above are found to be correct. e. only statements (a) and (b) are found to be correct.