Making a digital recording of a sound involves
a. analog-to-digital conversion c. electromagnetic waves
b. digital-to-analog conversion d. all of the above
A
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The youngest parts of Earth's crust are
a. the bottom layer found in the walls of the Grand Canyon. b. the continents. c. the continental margins. d. the Appalachian Mountains. e. the midocean rifts.
Jennifer is inside her windowless space station laboratory and finds herself increasingly pulled to the floor. What experiment can she perform inside the lab to decide if she is feeling the effect of an acceleration or an effect of gravity?
What will be an ideal response?
A series RLC circuit has a 100-? resistor, 2.0-mH inductor and a 4.0-?F capacitor connected across a 120-V rms ac source at 1000/? Hz. What is the power factor of this circuit?
A) 0.54 B) 0.94 C) 0.64 D) 0.84 E) 0.74
The first successful attempt to establish the size of the earth is credited to ________.