Galileo's telescopic discovery of moons orbiting Jupiter was important because it showed that
a. the universe could contain centers of motion other than Earth.
b. Earth might move along an orbit and not leave the Moon behind.
c. Jupiter was much more massive than Earth.
d. the universe could contain centers of motion other than Earth, Earth might move along an orbit and not leave the Moon behind, and Jupiter was much more massive than Earth.
e. the universe could contain centers of motion other than Earth and Earth might move along an orbit and not leave the Moon behind.
e
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A refracting astronomical telescope has objective and eyepiece lenses of focal lengths 30.0 cm and 0.40 cm, respectively. What is the angular magnification of this instrument?
a. 25 b. 49 c. 75 d. 143 e. 30.4
If the position of an electron (m = 9.11 × 10^-31 kg) could be measured to within 10-30 m, the uncertainty in the magnitude of its speed could be as much as
a. 6 × 10^-34 m/s. b. 6 × 10^25 m/s. c. 6 × 10^30 m/s. d. 1031 m/s. e. 1061 m/s.
What would happen if Jupiter was suddenly replaced by a black hole with the same mass as Jupiter?
A) The orbits of the planets in our solar system would be unaffected. B) The other planets would slowly be pulled into Jupiter, but the Sun would be unaffected. C) The other planets and the Sun would slowly be pulled into Jupiter. D) The entire solar system would rapidly be sucked into the black hole.
At what point is the charge per unit area greatest on the surface of an irregularly shaped conducting solid?
a. where surface curves inward b. where surface is flat c. where curvature is least d. where curvature is greatest