A neutral hollow spherical conducting shell of inner radius 1.00 cm and outer radius 3.00 cm has a +2.00-µC point charge placed at its center. Find the surface charge density
(a) on the inner surface of the shell.
(b) on the outer surface of the shell.
(a) -1590 µC/m2 (b) +177 µC/m2
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What happens when the gravity of a massive star is able to overcome neutron degeneracy pressure?
A) Gravity is not able to overcome neutron degeneracy pressure. B) The core contracts and becomes a black hole. C) The core contracts and becomes a white dwarf. D) The star explodes violently, leaving nothing behind. E) The core contracts and becomes a ball of neutrons.
Which characteristic is not generally true of a starburst galaxy?
A) The observed features that cause us to classify it as a "starburst" must be only temporary phenomena in the galaxy's history. B) The observed features of the starburst are thought to be caused by the presence of a supermassive black hole in the galaxy's center. C) Supernovae occur so frequently that their effects combine to drive a galactic wind that blows material into intergalactic space. D) Its rate of star formation is many times higher than the rate of star formation in the Milky Way.
A concave mirror has a focal length of 20 cm. What is the position (in cm) of the resulting image if the image is inverted and four times smaller than the object?
a. 15 b. 25 c. 50 d. 100 e. -15
When a light ray traveling in air meets the surface of a piece of glass, which of the following occur at the interface?
a. The light is totally reflected. b. Some of the light is reflected back into the air. c. Some light enters the glass and is refracted toward the normal. d. Some light enters the glass and is refracted away from the normal.. e. All of the light enters the glass.