A device that doesn't obey Ohm's law is a
A) copper wire.
B) silver bar.
C) light bulb.
D) resistor.
E) tungsten wire.
C
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Two charged particles 1 m apart exert a 1-N force on each other. If the magnitude of each charge is doubled, the force on each particle will be
A) 1 N. B) 2 N. C) 4 N. D) 8 N. E) none of the above
If ? = 8.0 V, at what rate is that emf providing energy to the circuit shown below?
a.
8.4 W
b.
7.6 W
c.
5.6 W
d.
11 W
e.
2.0 W
An AC voltage source, with a peak output of 200 V, is connected to a 25-W resistor. What is the rate of energy dissipated due to heat in the resistor?
a. 566 W c. 800 W b. 400 W d. 200 W
A tuning fork has a frequency of 400 Hz and hence a period of 2.50 × 10^-3 s. If the tuning fork is in an inertial frame of reference moving by the observer at speed of 0.680c, what is the frequency of the fork as measured by the observer? (Assume that measurements are strictly by optical means and that the speed of sound waves in air is not pertinent here.)
a. 454 Hz c. 605 Hz b. 293 Hz d. 265 Hz