A ceiling fan is turned on and reaches an angular speed of 120 rev/min in 20.0 s. It is then turned off and coasts to a stop in 40.0 s. In the 60.0 s of rotation, through how many revolutions did the fan turn?
a. 251
b. 377
c. 126
d. 188
b
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The leaves of a positively charged electroscope diverge more when an object is brought near the knob of the electroscope. The object must be:
A) a conductor B) an insulator C) positively charged D) negatively charged E) uncharged
The spectra of most galaxies show redshifts. This means that their spectral lines
A) have wavelengths that are longer than normal. B) always are in the red part of the visible spectrum. C) have wavelengths that are shorter than normal. D) have a higher intensity in the red part of the spectrum.
Your vocal cords are used to produce all the sounds you make while speaking
Indicate whether the statement is true or false
We do not yet know when (in what year) the maximum amount of crude oil produced per year in the United States will occur
What will be an ideal response?