Most telephone cables are made of copper wire of either 24 or 26 gauge. If the resistance of 24-gauge wire is 137 W/mile and the resistance of 26-gauge wire is 220 W/mile, what is the ratio of the diameter of 24-gauge wire to that of 26-gauge wire?
a. 1.6
b. 1.3
c. 0.62
d. 0.79
e. 0.88
B
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What kind of galaxy is the 'Milky Way?'
A: Spiral. B: Elliptical. C: Compound. D: Dwarf. E: Irregular.
What is the most important reason why an icy moon is more likely to be geologically active than a rocky moon of the same size?
A) Ice has a lower melting point than rock. B) Ice is less rigid than rock. C) Ice contains more radioactive elements than rock. D) Ice is affected by tidal forces to a greater extent than rock. E) Ice is less dense than rock.
Give an example in which there are clear distinctions among distance traveled, displacement, and magnitude of displacement. Specifically identify each quantity in your example.
A. Going from home to College, we make various turns on the road along the way and the total odometer reading is the total distance travelled. However the straight-line distance from home to College is the displacement in magnitude in that particular direction. B. Going from home to College, we make no turns on the road along the way and the total odometer reading is the total distance travelled. However the straight-line distance from home to College is the speed in magnitude but not in any particular direction. C. Going from home to College, we make no turns on the road along the way and the total odometer reading is the total distance travelled. However the circular-line distance from home to College is the displacement in magnitude but not in any particular direction.
A resistor, inductor, and capacitor are connected in series, each with an effective (rms) voltage of 65 V, 140 V, and 90 V, respectively. What is the magnitude of the phase angle between the current and applied voltage phasors in this circuit?
a. 38° c. 22° b. 28° d. 43°