Several charges in the neighborhood of point P produce an electric potential of 6.0 kV (relative to zero at infinity) and an electric field of 36 N/C at point P. Determine the work required of an external agent to move a 3.0-?C charge along the x axis from infinity to point P without any net change in the kinetic energy of the particle
a. 21 mJ
b. 18 mJ
c. 24 mJ
d. 27 mJ
e. 12 mJ
b
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CH3CH2OH is the structural formula for the compound named ______________
Fill in the blank(s) with correct word
The sunspot cycle has a period of
a. 19 years. b. 11 years. c. 38 years. d. 24 years.
Concerning dark energy, we do know:
A) that it is created when matter annihilates anti-matter. B) its density remains constant over time, so it is not important in the early Universe. C) combined with dark matter, it will ultimately produce a closed universe. D) that it was revealed with Type II supernovae distances in the late 1990s. E) that it makes up 90% of all the matter and energy in the whole universe.
If the density of the universe equals the critical density, then the Universe must be ___________ (i.e., having zero curvature)
Fill in the blank(s) with correct word