Special relativity is most concerned with
1) uniform motion,
2) accelerated motion,
3) the warping of space-time,
4) gravitation,
whereas general relativity is more concerned with
5) uniform motion.
6) accelerated motion.
7) energy and mass.
8) time.
Answer: 1, 6
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An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (mel = 9.11 × 10-31 kg, e = 1.60 × 10-19 C)
A) 2.2 × 107 m/s B) 1.9 × 10-2 m/s C) 1.9 × 10-30 m/s D) 3.0 × 106 m/s E) 8.0 × 106 m/s
Each of two parallel wires separated by 6.0 mm carries a 40-A current. These two currents are in the same direction. Determine the magnitude of the magnetic field at a point that is 5.0 mm from each of the wires.
A. 2.6 mT B. zero C. 1.9 mT D. 1.6 mT E. 3.2 mT
Life began in the sea
a. True b. False Indicate whether the statement is true or false
Scientists do not know what dark energy is, yet they claim that it is the dominant constituent of the mass-energy of the universe. What (if any) evidence supports this claim?
A) There are two lines of evidence: (1) measurements of the accelerating expansion and (2) the universal geometry inferred from the cosmic microwave background. B) There are two lines of evidence: (1) the fact that the universe is expanding and (2) the observed ratio of deuterium to hydrogen. C) The only evidence comes from observations of white dwarf supernovae that indicate the expansion rate is accelerating. D) The claim comes from models of the Big Bang, but it is not backed up by any observational evidence.