A temperature inversion occurs when the upper layers of air are
A) warmer than the lower regions of air.
B) cooler than the lower regions of air.
C) at the same temperature as lower regions of air.
Answer: A
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A wheel rotating about a fixed axis has a constant angular acceleration of 4.0 rad/s2. In a 4.0-s interval the wheel turns through an angle of 80 radians. Assuming the wheel started from rest, how long had it been in motion at the start of the 4.0-s interval?
A. 2.5 s B. 4.0 s C. 3.5 s D. 3.0 s E. 4.5 s
The unit called the hertz (Hz) is equivalent to
a. 1/s only. b. a reciprocal second only. c. s-1 only. d. all of these.
After a switch is thrown to remove the battery from a DC LR circuit, but the circuit is still left complete, the time constant represents
a. the time rate of change of the current in the circuit. b. the time rate of change of the induced emf in the circuit. c. the magnitude of the ratio of the current to the time rate of change of the current. d. all of the above. e. only (a) and (b) above.
A piano string of density 0.005 0 kg/m is under a tension of 1 350 N. Find the velocity with which a wave travels on the string
a. 260 m/s b. 520 m/s c. 1 040 m/s d. 2 080 m/s e. 4 160 m/s