In the formation of a cloud, moist air rises and
A) expands.
B) cools.
C) condenses.
D) all of the above
E) none of the above
Answer: D
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The _______________ effect changes the observed wavelength of an emitted photon if the source is moving toward or away from the observer
Fill in the blank(s) with correct word
The observed composition of ordinary matter in the universe—roughly 75 percent hydrogen and 25 percent helium—closely matches theoretical predictions based on the Big Bang model
Indicate whether the statement is true or false
There is no current in the circuit shown in the figure below until the switch is closed. The current through the 20-? resistor the instant after the switch is closed is either [1] 15 A or [2] 5.0 A, and the current through the 20-? resistor after the switch has been closed a long time is either [3] 5.0 A or [4] 15 A. Which combination of the above choices is correct?
a.
[1] and [3]
b.
[1] and [4]
c.
[2] and [3]
d.
[2] and [4]
e.
None of these
The law of conservation of energy:
a. fails because energy increases too fast as the speed gets closer to c. b. does not apply to the theory of special relativity. c. applies to the theory of special relativity as long as the relativistic adjustment factor is correctly included. d. applies to any given inertial system but not to others. e. applies to the theory of special relativity in exactly the same form as it applies for small velocities.