A circuit consists of a 9.3-mH coil, a 16.0-V battery, a parallel combination of a 19-? resistor and a 6.0-? resistor, and a switch, all in series. What is the time constant of this circuit?
a. 3.7E–4 s
b. 2.0E–3 s
c. 4.9E–4 s
d. 3.3E–2 s
e. This circuit has 2 time constants.
b
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Suppose a scientist holds a press conference at which he claims that 10% of the matter in the Milky Way is in the form of dust grains. Does his claim seem reasonable? Why or why not?
A) The 10% figure is too high because there are not enough heavy elements to make that much dust. B) It is reasonable because we already know that interstellar dust obscures our view through the disk of the galaxy. C) The 10% figure is too low because most of the mass of the galaxy is in the form of interstellar dust. D) It seems reasonable as long as we assume that red giant stars, which produce dust grains in their stellar winds, are more common than we thought.
The position of a mass that is oscillating on a spring is given by x = (12.3 cm) cos[(1.26 s-1)t]. What is the speed of the mass when t = 0.805 s?
A) - 13.2 cm/s B) 13.2 cm/s C) 8.19 cm/s D) - 8.19 cm/s E) 0 cm/s
A lens produces a sharply focused inverted image on a screen. What would you see on the screen if the lens were removed?
A. The image would be inverted and blurry B. The image would be upright and sharp. C. The image would be upright and blurry. D. There would be no image.
A 120-m long metal wire having a resistivity of 1.68 × 10-8 ? ? m has a resistance of 6.0 ?. What is the diameter of the wire?
A) 0.065 mm B) 0.65 mm C) 0.65 cm D) 0.65 m