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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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
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.