A diver shines an underwater searchlight at the surface of a pond (n = 1.33). At what angle (relative to the surface) will the light be totally reflected?
a. 47.3°
b. 41.2°
c. 51.1°
d. 58.7°
e. 49.8°
b
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A 120-V rms voltage at 1000 Hz is applied to a 2.00-mH inductor, a 4.00-?F capacitor and a resistor. If the rms value of the current in this circuit is 0.400 A, what is the value of the resistor?
A) 299 ? B) 95.1 ? C) 423 ? D) 120 ? E) 240 ?
If you measure the distance between two telephone poles with a steel tape on a very hot day, your measured distance will be
A) a bit short. B) a bit long. C) the same as on an average-temperature day.
Dielectrics: The square plates of a 5000-pF parallel-plate capacitor measure 50 mm by 50 mm and are separated by a dielectric that is 0.23 mm thick and totally fills the region between the plates. The voltage rating (the maximum safe voltage) of the capacitor is 400 V. What is the maximum energy that can be stored in this capacitor without damaging it? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 0.40 mJ B. 0.50 mJ C. 0.60 mJ D. 0.70 mJ E. 0.80 mJ
If the mass of the Sun were cut in half, how would the force between the Sun and the Earth change?
a) it would quadruple b) it would double c) it would remain unchanged d) it would decrease by a factor of four e) it would decrease by a factor of two