What size capacitor must be placed in series with a 30. ? resistor and a 40. mH coil if the resonant frequency of the circuit is to be 1000. Hz?
A) 2.0 ?F
B) 0.63 ?F
C) 3.3 ?F
D) 6.0 ?F
E) 4.5 ?F
B
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If the instantaneous velocity of an object is constant, then so is its
a. velocity. b. distance. c. acceleration. d. displacement.
A loop of wire in a generator produces alternating current by:
a. rotating in a constant electric field. b. rotating through areas of high and low electrical force. c. creating current by rotating in an existing magnetic field. d. creating a varying magnetic field with its rotational kinetic energy. e. being wound around a metal core to produce an electromagnet.
What approach for estimating the distance to a galaxy requires the measurement of a galaxy's rotation speed?
A. Type Ia supernova as standard candles B. the Tully-Fisher method C. Hubble's law D. Cepheid variables as standard candles
In exactly 14 days after a full moon, one would see a
a. new moon. b. waxing crescent moon. c. first-quarter moon. d. waning crescent moon.