Suppose that large jovian planets had never formed in our solar system. Which of the following would most likely be true?
A) Neither the asteroid belt nor Oort cloud would exist.
B) Earth would have suffered far fewer impacts.
C) There would be a large empty region in our solar system between the orbit of Mars and the Kuiper belt.
D) Earth would orbit much closer to the Sun.
A) Neither the asteroid belt nor Oort cloud would exist.
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In a region where the electric field is axial but the charge density is zero, what is Es (if C is some constant)?
A. C/s2 B. C/s C. zero E. Cs F. Cs2 T. None of the above
Hydrogen atoms have a spectral line with a wavelength of 656 nm. Suppose we observe this particular line from hydrogen gas located near the event horizon of a black hole. Assuming the gas has no motion toward or away from us, where would this line appear in the spectrum?
A) at a wavelength larger than 656 nm B) at a wavelength shorter than 656 nm C) at the same wavelength of 656 nm that we observe for this line in the laboratory D) We could not record a spectrum from this gas because its light would be sucked into the black hole and therefore would never reach Earth.
If the density of the universe is less than the critical density, then the total energy of the universe is
A) zero. B) negative. C) positive.
A hollow cylindrical (inner radius = 1.0 mm, outer radius = 3.0 mm) conductor carries a current of 80 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 2.0 mm from the axis of the conductor
a. 8.0 mT b. 3.0 mT c. 5.3 mT d. 16 mT e. 1.2 mT