If 5.0 × 10^21 electrons pass through a 20-? resistor in 10 min, what is the potential difference across the resistor?
a. 21 V
b. 32 V
c. 27 V
d. 37 V
e. 54 V
c
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Why is the conduction in a fin not able to be determined for the case where the base temperature is constant, as in Figure 2-9?
What will be an ideal response?
A series RLC circuit is connected across a 240-Hz AC source, where ?Vmax = 140 V, R = 480 ?, C = 0.250 ?F, and L = 3.25 H. What is the average power delivered to this circuit?
a. 77.9 W b. 1.78 W c. 3.56 W d. 0.890 W
The frequency of visible light determines its color
a. True b. False Indicate whether the statement is true or false
A nearsighted person cannot see objects clearly beyond 50 cm (the far point). If the patient has no astigmatism and contact lenses are prescribed, what is the power of the lens required to correct the patient's vision?
a. -2.0 diopters c. -4.0 diopters b. -3.3 diopters d. -5.0 diopters