Spherical Mirrors: If an object is placed at the center of curvature of concave mirror, the image formed by the mirror is located
A. out beyond the center of curvature.
B. at the center of curvature.
C. between the center of curvature and the focal point.
D. at the focal point.
E. at infinity.
Answer: B
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At a certain instant in time, the field of an electromagnetic wave in a vacuum points in the -z direction, and the field points in the +y direction. In what direction is this wave traveling?
A) +x direction B) -x direction C) +y direction D) -z direction E) +z direction
The three graphs in the figures below represent the position vs. time for objects moving along the x-axis. Which, if any, of these graphs is not physically possible?
An iron block of density ?Fe and of volume l3 is immersed in a fluid of density ?fluid. The block hangs from a scale which reads w as the weight. The top of the block is a height h below the surface of the fluid. The correct equation for the reading of the scale is
a. w = (?Fe ? ?fluid)ghl2. b. w = (?fluid ? ?Fe)gl3. c. w = (?Fe ? ?fluid)gl3. d. w = (?Fe + ?fluid)ghl2. e. w = (?Fe + ?fluid)gl3.
The second brightest object in the sky is
a. the Sun. b. the Moon. c. Venus. d. Mars.