The halo in the Milky Way is a part of the _____ of the galaxy
A) disk component
B) spherical component
C) central bulge
D) spiral arms
B
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Electrons flow in a wire when there is
A) an imbalance of charges in the wire. B) a potential difference across its ends. C) a difference in potential energy across its ends. D) none of the above
A long straight wire is parallel to one edge and is in the plane of a single-turn rectangular loop as shown. If the loop is moving in the plane shown so that the distance x changes at a constant rate of 20 cm/s, what is the magnitude of the emf induced in the loop at the instant x = 5.0 cm? Let I = 50 A, a = 50 cm, b = 6.0 cm
a.
11 ?V
b.
22 ?V
c.
27 ?V
d.
16 ?V
e.
34 ?V
In order for a telescope to produce a large magnification one would select lenses of
A. short focal length for both objective and eyepiece. B. large focal length for the objective and short focal length for the eyepiece. C. short focal length for the objective and long focal length for the eyepiece. D. large focal length for both objective and eyepiece.
The formation of the early Appalachian Mountains began as a result of tectonic activity during the
A) Paleozoic era. B) Triassic era. C) Mesozoic era. D) Cenozoic era.