The center of the Milky Way galaxy is in the direction of the constellation ____
a. Sagittarius
b. Scorpius
c. Orion
d. Perseus
e. Andromeda
a
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In science, a broad idea that has been repeatedly verified so as to give scientists great confidence that it represents reality is called
A) a paradigm. B) a hypothesis. C) Ptolemaic model. D) a theory.
A 20-?F capacitor has a charge of 60 ?C. How much energy is stored in this capacitor?
A) 70 ?J B) 80 ?J C) 90 ?J D) 100 ?J E) 110 ?J
An object 1.25 cm tall is placed 100 cm in front of a convex lens with a focal length of magnitude 50 cm. A concave lens with a focal length of magnitude 20 cm is placed 90 cm beyond the first lens
Where is the final image located? A) 10 cm in front of the second lens B) 20 cm past the second lens C) 17 cm past the second lens D) 10 cm past the second lens E) 20 cm in front of the second lens
An insulated container, filled with water, contains a thermometer and a paddle wheel. The paddle wheel can be rotated by an external source. This apparatus can be used to determine:
A. specific heat of water B. relation between kinetic energy and absolute temperature C. thermal conductivity of water D. efficiency of changing work into heat E. mechanical equivalent of heat