___________ associations and ___________ associations are groups of stars born together but not gravitationally bound to one another
Fill in the blank(s) with correct word
T, OB
OB, T
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An uncharged spherical conducting shell surrounds a charge -q at the center of the shell. The charges on the inner and outer surfaces of the shell are respectively
a. -q, -q. b. -q, +q. c. +q, -q. d. +q, +q. e. +q, 0.
What are the outward forces that act on a star? What are the inward forces? How do these compare?
What will be an ideal response?
At a particular point and instant, the magnetic field component of an electromagnetic wave is 15.0 ?T. What is the magnetic energy density of this wave at that point and instant?
(c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2 ) A) 4.47 × 10-4 J/m3 B) 9.72 × 10-5 J/m3 C) 2.26 × 10-4 J/m3 D) 8.95 × 10-5 J/m3 E) 1.79 × 10-4 J/m3
In the fusion of low-mass nuclei to make heavier nuclei
A) thermal energy is produced. B) nuclear energy is converted to other forms. C) the final nucleus has a smaller rest-mass than the total rest-mass of the original nuclei. D) All of the above.