If the internal temperature of the sun is 15 x 106 K, what is the average kinetic energy of protons in this environment?
A)
0.040 eV
B)
1.3 keV
C)
1.9 keV
D)
1.3 MeV
E)
1.9 MeV
C
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Doubling the diameter of a loop of wire produces what change of induced emf?
A. The induced emf is 4 times as much. B. The induced emf is twice as much. C. There is no change in the induced emf. D. The induced emf is 6.28 times as much.
Significant Figures: What is the quotient of 2.43 ÷ 4.561 expressed to the correct number of significant figures?
A. 5.3278 × 10-1 B. 5.328 × 10-1 C. 5.33 × 10-1 D. 5.3 × 10-1
Which of the following was not a major advantage of Copernicus's Sun-centered model over the Ptolemaic model?
a. It made significantly better predictions of planetary positions in our sky. b. It offered a more natural explanation for the apparent retrograde motion of planets in our sky. c. It allowed calculation of the orbital periods and distances of the planets.
A stone is thrown into a quiet pool of water. With no fluid friction, the amplitude of the waves falls off with distance r from the impact point as
a. 1/r3 b. 1/r2 c. 1/r3/2 d. 1/r1/2 e. 1/r