The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents stars that have no ongoing nuclear fusion?
A) a
B) b
C) c
D) d
E) e
B) b
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What kind of object do we think lies in the center of the Milky Way Galaxy?
A) a black hole of about 4 million solar masses B) a gigantic x-ray binary system C) a dense cluster of young, hot stars D) an enormous collection of dark matter, explaining why we detect no light at all from the galactic center
A piece of wood 350 mm × 350 mm and 15 mm thick conducts heat through its thickness under steady state conditions
The rate of heat flow is measured to be 14.0 watts when the temperature difference is 28 C°. Determine the coefficient of thermal conductivity for this wood A) 9.2×10-4 J/(m?s?C°) B) 270 J/(m?s?C°) C) 16 J/(m?s?C°) D) 0.061 J/(m?s?C°) E) 33 J/(m?s?C°)
An unfortunate bug splatters on the windshield of a moving car. Describe the forces, impulses, momentum changes, and accelerations of both the bug and the car
What will be an ideal response?
The existence of the neutrino was postulated to account for which basic conservation laws during the beta decay process?
a. conservation of energy b. conservation of momentum c. Both choices a and b are valid. d. None of the above choices are valid.