The frequency in an AC series circuit is quadrupled. By what factor does this change the capacitive reactance?
a. 1/4
b. 1/16
c. 4
d. 16
e. 1
a
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The number of electrons in an atom of an element is the same as the element's
a. atomic number. b. period number. c. mass number. d. group number.
In a laboratory experiment, a student brings up the rotational speed of a flywheel to 30.0 rpm. She then allows it to slow down on its own, and counts 240 revolutions before the apparatus uniformly comes to a stop
The moment of inertia of the flywheel is 0.0850 kg ? m2. What is the magnitude of the retarding torque on the flywheel? A) 0.0000136 N ? m B) 0.0787 N ? m C) 0.159 N ? m D) 0.000278 N ? m E) 0.0425 N ? m
A champion athlete can produce one horsepower (746 W) for a short period of time. If a 70-kg athlete were to bicycle to the summit of a 500-m high mountain while expending power at this rate, she would reach the summit in ____ seconds
a. 1 b. 460 c. 500 d. 1 000 e. 35 000
At what two celestial locations do the celestial equator and ecliptic coincide?
a. winter solstice and summer solstice b. vernal equinox and autumnal equinox c. they coincide at all points because they are the same. d. north celestial pole and south celestial pole e. zenith and east point