What is the magnetic moment of a rectangular loop having 120 turns that carries 6.0 A if its dimensions are 4.0 cm × 8.0 cm?
A) 0.23 A ? m2
B) 2.3 A ? m2
C) 23 A ? m2
D) 230 A ? m2
B
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Galactic disks appear blue because:
A) they contain no G, K, or M dwarfs. B) they contain only blue reflection nebulae. C) dust obscures the longer, red, wavelengths. D) O and B blue giants are much brighter than G, K, or M dwarfs. E) dark matter gravitationally shifts all wavelengths towards the blue.
In what way do observations of binary star systems support the special theory of relativity?
A) Stars in binary systems often orbit at speeds close to the speed of light, allowing us to check whether time dilation really occurs. B) Stars in binary systems are moving, so we can compare their moving masses to their rest masses. C) The fact that the stars appear distinct supports the idea that the speed of light is unaffected by the motion of the stars. D) Binary systems have two stars, and therefore give us twice the opportunity to test the theory than single star systems.
A convex lens has a focal length f. An object is placed between f and 2f on the axis. The image formed is located
A) at 2f. B) between f and 2f. C) at f. D) between the lens and f. E) at a distance greater than 2f from the lens.
A child is standing at the rim of a disk holding a rock. The disk rotates freely without friction. At the instant shown, the child throws the rock radially outward. Which of the indicated paths most nearly represents the trajectory of the rock as seen from above?