If the entire galaxy (with a diameter of 100,000 light years) were represented by a circle with a diameter of 4,400 km (similar to the width of the continental United States), then how far apart would be the Sun and its nearest stellar neighbor,
Proxima Centauri (which is 4.2 light years away)?
A) about 0.2 meters (about the length of an adult's forearm)
B) about 200 meters (about 2 football fields)
C) about 20 meters (about the size of a large classroom)
D) about 2 meters (about 2 long footsteps)
B
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The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil?
A) 70 V B) 30 V C) 100 V D) 400 V E) 480 V
Galileo wrote the Almagest
a. True b. False Indicate whether the statement is true or false
Harlow Shapley found the Milky Way was:
A) centered on the Earth. B) much smaller than previously thought. C) rapidly expanding. D) much larger than previously thought. E) uniformly spherical in shape.
When we subtract a velocity vector from another velocity vector, the result is:
a. another velocity. c. a displacement. b. an acceleration. d. a scalar.