A supersonic jet is 7,800 kilometers east of U. S. airspace. If the jet flies at a constant velocity of 1,300 kilometers per hour to the west, how much time will it take the jet to fly
one-third of the way to U. S. airspace?

answer: the correct answer is   air pressure at the top of mount everest is higher than at the bottom of the grand canyon.

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explanation:

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.