Where was the Sun in Ptolemy's model of the universe?
A) at the center
B) slightly offset from the center
C) between Earth and the Moon's orbit
D) between the orbits of Venus and Mars
E) at the outer edge, beyond Saturn's orbit
D
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Potential Energy: How much energy is necessary to place three +2.0-µC point charges at the vertices of an equilateral triangle of side 2.0 cm if they started out extremely far away? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 4.5 J B. 5.4 J C. 6.7 J D. 7.6 J
If you do 10 J of work to push 1 coulomb of charge into an electric field, its voltage with respect to its starting position is
A) less than 10 V. B) 10 V. C) more than 10 V. D) none of the above
A magnetic field exists in a current-carrying coil of wire
A) if it contains a piece of iron. B) with or without a contained piece of iron. C) only if the current changes.
How did the corn blight of the 1970s affect agriculture? Was that outcome useful in the long term
What will be an ideal response?