Superconductors have a primary advantage in that they will _______
a. reduce heating losses in transmission lines
b. provide large magnetic fields for levitation
c. be able to conduct more current
d. allow electric motors to run almost forever
a
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Magnetic Field of a Long Wire: A vertical wire carries a current vertically downward. To the east of this wire, the magnetic field points
A. north. B. east. C. south. D. down.
Which jovian planets in our solar system have rings?
A) Saturn only B) Jupiter and Saturn only C) all but Neptune D) all four of the jovian planets have rings.
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.
In the figure, the coefficient of kinetic friction between the surface and the larger block is 0.20, and the coefficient of kinetic friction between the surface and the smaller block is 0.30. If F = 10 N and M = 1.0 kg, what is the tension in the connecting string?
A. 8.0 N B. 6.0 N C. 6.7 N D. 8.7 N E. 3.0 N