The kilowatt-hour is a unit of ______________
Fill in the blank(s) with correct word
energy
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The discovery of Neptune was fundamentally different from the discovery of Uranus
a. True b. False Indicate whether the statement is true or false
Coulomb's Law: Two point charges q = -8.50 µC are fixed 10.0 cm apart along a horizontal bar, as shown in the figure. Their electrical forces will be used to balance the weight of a very small sphere carrying a charge Q = + 15.0 ?C, 10.0 cm from each of them in a place where g = 9.80 m/s2. What is the greatest mass M this sphere can have without falling? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
Fill in the blank(s) with the appropriate word(s).
Observers in all reference frames will agree (perhaps by tracking individual electrons) that the bar’s left side becomes negatively charged and its right side becomes positively charged, meaning that just after the bar begins to move (but before the charges have time to pile up at the ends) some leftward electromagnetic force must have been acting on the bar’s electrons. What type of force is this 
in the implied reference frame of the diagram above?
A. The force is purely electric. B. The force is purely magnetic. C. The force is both electric and magnetic. D. There is no force on the bar’s electrons in this frame.
The longest day (daylight) of the year for the Northern Hemisphere occurs at the time of the
a. autumnal equinox. b. vernal equinox. c. winter solstice. d. summer solstice.