What was the Ptolemaic model?
A) an Earth-centered model of planetary motion published by Ptolemy
B) the Earth-centered model of the cosmos in which the Earth was surrounded by seven perfect spheres, one each for the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn
C) a Sun-centered model of planetary motion published by Ptolemy
D) the first scientific model to successfully predict solar and lunar eclipses
A
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The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
A. E. B. F. C. G. D. H. E. A.
What is one difference between alpha () and beta () radiation?
a. Alpha radiation is more easily stopped by an obstacle than beta radiation. b. Alpha radiation is less easily stopped by an obstacle than beta radiation. c. Alpha radiation is composed of protons and beta radiation consists of electrons. d. Beta radiation is negative, but alpha radiation is always neutral. e. Alpha radiation consists of waves and beta radiation is composed of particles.
Which clock measures a coordinate time between the synchronization and comparison events?
A. Clock A B. Clock B C. Both D. Neither
When the isotope bismuth-213 emits an alpha particle, what new element results?
A) lead B) platinum C) polonium D) thallium