What is the focal point of a convex or concave mirror?
a. The point at the center of the mirror.
b. The point halfway between the mirror and the center of the sphere that the mirror is part of.
c. The point at the center of the sphere that the mirror surface is part of.
d. The point halfway between the mirror and sphere center for a convex mirror, but at the center of the sphere for a concave mirror.
e. The point at the center of the object the mirror is reflecting.
b
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The idea of dark matter arose to explain gravitational effects observed in galaxies and clusters of galaxies
However, studies of the early universe (especially of the cosmic microwave background and of chemical abundances) also tell us something about dark matter. What do they tell us? A) They add further support to the idea that dark matter really exists and is made of non-ordinary (nonbaryonic) matter, such as WIMPs. B) They do not support the conclusion that dark matter is the dominant form of matter in the universe. C) They tell us that dark matter probably exists, but that it must be made of ordinary (baryonic) matter in the form of MACHOs. D) They tell us that dark matter was produced during the era of nuclei.
The basic energy resource that fueled the "industrial revolution" was a form of
A) nuclear energy. B) thermal energy. C) gravitational energy. D) chemical energy. E) radiant energy.
A deuteron is accelerated from rest through a 10-kV potential difference and then moves perpendicularly to a uniform magnetic field with B = 1.6 T. What is the radius of the resulting circular path? (deuteron: m = 3.3 × 10^?27 kg, q = 1.6 × 10^?19 C)
a. 19 mm b. 13 mm c. 20 mm d. 10 mm e. 9.0 mm
A 400-m tall tower casts a 600-m long shadow over level ground. At what angle ? is the sun elevated above the horizon?
A) 33.7° B) 41.8° C) 48.2° D) 65.1° E) Can't be found; not enough information.