Two flat glass plates are in contact along one end and are separated by a sheet of paper 3.3 × 10^?6 m thick at the other end. The top plate is illuminated by a monochromatic light source of wavelength 514 nm. How many dark parallel bands will be evident across the top plate? (1 nm = 10?9 m)
a. 7
b. 11
c. 6
d. 13
e. 9
d
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How is the presence of space debris accounted for by solar system models?
a. Space debris is left over material from the early solar system that never formed into a planet. b. Space debris was formed by the collision of objects after the planets formed. c. Space debris is material that existed in our region of space before the sun formed. d. Both a and b e. All of the above
The lunar mare are radioactively dated at:
A) 4.6 billion years old, forming first among the lunar features. B) 4.2-3.9 billion years old, comparable to the adjacent highlands. C) 3.9-3.2 billion years old, forming after most of the bombardment was over. D) 3.5-2.5 billion years old, similar to the formation of our own oceans. E) less than a billion years old, the most recent additions to the Moon.
If ? = 40°, ? = 60°, and M = 4.0 kg, determine the tension in string 1
a.
15 N
b.
22 N
c.
17 N
d.
20 N
e.
36 N
Doppler Effect: A siren emitting sound of frequency 1000 Hz approaches a stationary observer at one-half the speed of sound. The observer hears a frequency of
A. 1000 Hz B. 2000 Hz. C. 500 Hz. D. 1500 Hz. E. None of these.