Which of the following statements about quasars is not correct?
A. Their cores are extremely large, probably several thousand light-years across.
B. Their spectra have the largest redshifts observed.
C. They are probably the most distant observable objects.
D. They have abnormally high luminosities.
E. Sometimes they appear in pairs, due to gravitational lenses formed by intervening galaxies.
Answer: A
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Give an example of a practical problem in which the variation of thermal conductivity with temperature is significant and for which a numerical solution is therefore the only viable solution method.
What will be an ideal response?
Which of the following statements about large-scale structure is probably not true?
A) Clusters and superclusters appear to be randomly scattered about the universe, like dots sprinkled randomly on a wall. B) Galaxies and clusters have grown around tiny density enhancements that were present in the early universe. C) Voids between superclusters began their existence as regions in the universe with a slightly lower density than the rest of the universe. D) Many cluster and superclusters are still in the process of formation as their gravity gradually pulls in new members.
A football field is 120 yd long and 50 yd wide. What is the area of the football field, in m2?
A) 2400 m2 B) 4206 m2 C) 6000 m2 D) 5019 m2 E) 3688 m2
A mass of 1.53 kg is attached to a spring and the system is undergoing simple harmonic oscillations with a frequency of 1.95 Hz and an amplitude of 7.50 cm
What is the speed of the mass when it is 3.00 cm from its equilibrium position? A) 0.0368 m/s B) 0.551 m/s C) 0.421 m/s D) 0.842 m/s E) 0.919 m/s