A solid nonconducting sphere of radius R carries a charge Q distributed uniformly throughout its volume. At a certain distance r1 (r1 < R) from the center of the sphere, the electric field has magnitude E
If the same charge Q were distributed uniformly throughout a sphere of radius 2R, the magnitude of the electric field at the same distance r1 from the center would be equal to A) E/8.
B) E/2.
C) 2E.
D) 8E.
E) E.
A
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The first successful attempt to establish the size of the earth is credited to ________.
Spherical Mirrors: Single concave spherical mirrors produce images that
A. are always smaller than the actual object. B. are always larger than the actual object. C. are always the same size as the actual object. D. could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object. E. are always real.
Which of the following statements about novae is true?
A) A star system that undergoes a nova may have another nova sometime in the future. B) A nova involves fusion taking place on the surface of a neutron star. C) A nova is the most powerful type of explosion ever seen in the universe. D) When a star system undergoes a nova, it brightens as much as a star system undergoing a supernova. E) A nova can occur on a single, isolated star.
Suppose that several projectiles are fired upward. Which one will be in the air longest? (R is range, h is highest elevation, and t is time of flight.)
A) The one with the farthest range, R B) The one with the highest maximum elevation, h C) The one for which the product of (R)(t)(h) is maximum D) The one with the greatest initial velocity E) The one with the minimum elevation, h