What is the inductive reactance of a 20-mH inductor at a frequency of 60 Hz?
A) 7.5 ?
B) 0.13 ?
C) 1.2 ?
D) 1.2 m?
E) 7.5 m?
A
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The Earth cannot contain a giant permanent magnet because
A) the Earth doesn't have enough iron. B) the core would repel it. C) the Earth isn't large enough. D) ferromagnetism disappears at high temperature. E) its magnetic field is too large.
An optical SETI signal would most likely consist of
A) using mirrors to reflect light from the surface of a planet B) using a giant disk to block out the light from the parent star C) rapid, short bursts of intense laser light D) a continuous beam of laser light
Which of the following properties is more likely to be a characteristic of a halo star in the Milky Way, not a disk star?
A) It could be quite young. B) It has a low ratio of iron to hydrogen. C) It orbits the center of the Milky Way galaxy. D) It is moving very slowly relative to the Sun's motion.
Three 4.00-? resistors are connected in parallel to a 10.4-V battery. What is the current in any one of the resistors?
a. 14.4 A b. 6.76 A c. 2.60 A d. 41.6 A e. 6.40 A