The moon's distance from Earth is measured very accurately by bouncing a laser beam off of a small mirror left on the surface of the moon. If a laser is fired at the moon and the signal returns in 2.6 seconds, what is the distance to the moon?
a. 390,000 km
b. 390,000 m
c. 780,000 km
d. 780,000 m
A
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To the surprise of Michelson and Morley, their interferometer experiment provided evidence that the speed of light is
A) invariant. B) the same whether its source approaches or recedes. C) constant. D) all of the above
When a wool blanket is used to keep warm, what is the primary insulating material?
a. wool b. air c. the trim around the edge of the blanket d. a thin layer of aluminum foil (usually not apparent) inside the blanket
A 60-kg swimmer suddenly dives horizontally from a 150-kg raft with a speed of 1.5 m/s. The raft is initially at rest. What is the speed of the raft immediately after the diver jumps if the water has negligible effect on the raft?
What will be an ideal response?
There are about
A) 10 different types of atoms. B) 100 different types of atoms. C) a thousand different types of atoms. D) an unlimited number of different types of atoms.