The planets never travel in a straight line as they orbit the Sun. According to Newton's second law of motion, this must mean that
A) the planets are always accelerating.
B) the planets have angular momentum.
C) the planets will eventually fall into the Sun.
D) a force is acting on the planets.
D
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A) a magnetic field. B) an electric field. C) both of these D) neither of these
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Two thin-walled concentric conducting spheres of radii 5.0 cm and 10 cm have a potential difference of 100 V between them. (k = 1/4??0 = 8.99 × 109 N • m2/C2)
(a) What is the capacitance of this combination? (b) What is the charge carried by each sphere?