A cyclotron operates at 10. MHz. What magnetic field is needed to accelerate protons?
A) 0.25 T
B) 0.25 Gauss
C) 0.12 T
D) 1.1 T
E) 0.66 T
E
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Studying the magnetospheres of the jovians has allowed us to measure their:
A) rotation rates. B) orbital period. C) orbital radius. D) gravity. E) ring system diameters.
Which scientists played a major role in overturning the ancient idea of an Earth-centered universe, and about when?
A) Copernicus, Kepler, and Galileo; about 400 years ago B) Aristotle and Copernicus; about 400 years ago C) Newton and Einstein; about 100 years ago D) Huygens and Newton; about 300 years ago E) Aristotle and Plato; about 2,000 years ago
The intensity of radiation reaching the Earth from the Sun is 1350 W/m2 . The Earth's radius is 6.4 × 10^6 m. How big a force does this radiation exert on the Earth? (Assume it is all absorbed.)
a. 5.8 × 10^8 N b. 1.2 × 10^9 N c. 2.3 × 10^9 N d. 4.6 × 10^9 N e. 1.7 × 10^17 N
A pair of tennis balls fall through the air from a tall building. One ball is regular and the other is filled with lead pellets. The ball to reach the ground first is the
A) regular ball. B) lead-filled ball. C) same for both