An inductor produces a back emf in a DC series RL circuit when a switch connecting the battery to the circuit is closed. We can explain this by
a. Lenz's law.
b. increasing magnetic flux within the coils of the inductor.
c. increasing current in the coils of the inductor.
d. all of the above. e. only (a) and (c) above.
D
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A baseball player throws a ball straight up into the air. At a height of 3.00 m above the release point, the ball is moving at 1.25 m/s. What was the ball's initial speed?
a. 7.56 m/s b. 7.77 m/s c. 57.2 m/s d. 60.4 m/s
To say that an object is moving at constant velocity means that it is
1) at rest, 2) moving at an unchanging speed, 3) moving at an unchanging speed in a straight-line path, and that its acceleration is 4) zero. 5) constantly increasing (or decreasing). 6) uniform.
A sound source emits 20.0 W of acoustical power spread equally in all directions. The threshold of hearing is 1.0 × 10-12 W/m2. What is the sound intensity level 30.0 m from the source?
A) 92.5 dB B) 81.5 dB C) 1.77 × 10-3 dB D) 1.77 × 10-3 W E) -27.5 dB
Oxygen in Earth's atmosphere is outgassed in volcanic eruptions
Indicate whether the statement is true or false