What is the study of cosmology?
What will be an ideal response?
The study of large scale structure and evolution of the universe.
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Socrates died from ingesting the alkaloid named
a. nicotine. b. caffeine. c. quinine. d. coniine.
Consider the following quantities: (1) current, (2) resistance, (3) coil area, (4) wire cross-sectional area, and (5) magnetic field. Upon which of the quantities is the magnetic dipole moment of a current carrying coil dependent?
a) 1 and 5 only b) 1 and 2 only c) 2 and 3 only d) 1, 3, 4, and 5 e) 1 and 3 only
All of the following observations are real. Which one does not support the theory that active galactic nuclei are powered by accretion disks around massive black holes?
A) X-ray emission from active galactic nuclei can vary significantly in times as short as a few days. B) The total luminosity of an active galactic nucleus can be as high as about 10 billion times that of the Sun. C) Spectra of active galactic nuclei show that clouds of gas are orbiting a central object at very high speed. D) The most luminous active galactic nuclei have huge redshifts.
Derive an expression for the geometric shape factor F1–2 for a rectangular surface A1, 1 by 20 m placed parallel to and centered 5 m above a 20-m-square surface A2.
GIVEN
• Rectangular surface A1 and square surface A2
• A1 is parallel to and centered 5 m above A2
• Dimensions of A1 = 1 m × 20 m
• A2 is 20 m square
FIND
• The shape factor F12
SKETCH
