An atom can be excited into a higher energy state by absorbing a __________
Fill in the blank(s) with correct word
photon
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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.
A clerk can lift cylindrical packages 1 meter vertically, or can roll them up a 2-meter-long ramp to the same elevation. With the ramp, the applied force required is about
A) half as much. B) the same. C) twice as much. D) four times as much.
Why were the two Keck 400" telescopes placed together atop Mauna Kea?
What will be an ideal response?
A possible means of spaceflight is to place a perfectly reflecting aluminized sheet into Earth orbit and use the light from the Sun to push this solar sail. If a huge sail of area 6.00 × 10^5 m2 and mass 6000 kg were placed into orbit and turned toward the Sun, what would be the force exerted on the sail? (Assume a solar intensity of 1380 W/m2.)