Two small spheres spaced 20.0 cm apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57 x 10-21 N?

A. 562

B. 9.14 * 10^3

C. 1.01 * 10^6

D. 891

How long would the night be on June 21 in Fairbanks, Alaska?

An initially stationary object experiences an acceleration of 6 m/s2 for a time of 15 s. How far will it travel during that time?

A wave is traveling through X. What can be known about X? It is empty space. It is any medium. It is a solid. It is a liquid.

How can operators avoid damaging Submersed Aquatic Vegetation (SAV) beds that are usually found in shallow areas of water?

Which element is not part of the rhetorical triangle designed by Aristotle? speaker credibility audience emotion content logic length of address

A 40 kg-skier starts at the top of a 12-meter high slope. At the bottom, she is traveling 10 m/s. How much energy does she lose to friction? A. She doesn't lose any because mechanical energy is always conserved. B. 4,704 J C. 2,000 J D. 2,704 J

In a series circuit, loads which have the same voltage dropped across them will have?.

Which of the following describes temperature

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Cooling down after a workout allows the oxygen to continuing moving through the body and keeps the muscles from tightening up to fast