Which method relies on the mass of a dark object revealing its presence?
A) pulsars slowing down irregularly
B) temporary brightening of a distant star by a gravity lens
C) asteroidal occultations
D) stellar eclipses
E) ring occultations
B
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For a BCC crystal, which of the following x-ray (hkl) diffraction peaks is not present?
(a) (200) (b) (110) (c) (130) (d) (111)
Force on a Wire: A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T. What is the magnitude of the magnetic force on it?
A. zero B. 0.15 N C. 0.30 N D. 0.60 N
What are planetesimals?
A. very small planets B. satellites of the giant planets C. large chunks of material (1 mm to several km in size) from which the planets were formed D. planets that are found orbiting other stars
Which of the following is not evidence for dark matter?
A) gravitational lensing around galaxy clusters B) X-ray observations of hot gas in galaxy clusters C) the broad absorption lines found in the spectra of elliptical galaxies D) the flat rotation curves of spiral galaxies E) the expansion of the universe