The first evidence for a finite, not infinite, speed of light came from observations in which
A) Galileo measured the time for light to travel to a distant mountain and back again.
B) sunlight was observed just as the sun was fully eclipsed by the moon.
C) Galileo reflected a light beam from rapidly rotating mirrors in a laboratory.
D) the orbital time of one of Jupiter's moons was observed during two successive orbits.
E) sunlight passed through a narrow slit as the sun rose at the summer solstice (longest day of the year).
Question 2
Would you be richer if you had a hunk of gold whose weight is 1 newton on the moon, or one whose weight is 1 newton on Earth, and why?
A) 1 newton on the moon, because then the gold's weight on the moon would be larger.
B) 1 newton on the moon, because then the gold's mass would be larger.
C) 1 newton on Earth, because then the gold's mass would be larger.
D) 1 newton on Earth, because then the gold's weight on Earth would be larger.
E) It wouldn't make any difference, because the amount of actual gold would be the same in both cases.
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