The circuit below contains 3 100-W light bulbs and a capacitor. The emf is 110 V. Which light bulb(s) is(are) brightest? (Assume the capacitor is fully charged.)
a.
A
b.
B
c.
C
d.
A and B
e.
All three are equally bright.
d
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According to the laws of thermal radiation, hotter objects emit photons with
A) a lower average frequency. B) a shorter average wavelength. C) a lower average energy. D) a higher average speed.
A plane with a wingspan of 35.0 m is flying horizontally at a speed of 280 m/s over a location where the Earth's magnetic field is 45.0 ?T at 55° below the horizontal. What voltage is generated between the wingtips?
a. 3.6E–1 V b. 2.5E–1 V c. 6.3E–1 V d. 4.4E–1 V
There is a 10-A current through a wire for 2.0 min. (e = 1.60 × 10-19 C)
(a) How much charge has passed through this wire? (b) How many electrons have passed any point in the wire?
The near point of a farsighted person's uncorrected eyes is 80 cm. What power contact lens should be used to move the near point to 25 cm from this person's eyes?
A) 2.8 diopters B) -2.8 diopters C) -4.0 diopters D) -4.2 diopters E) 4.2 diopters