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

What do two or more elements combine to from? A compound An element A substance A solution

Physics question: Momentum

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This roller coaster has potential energy when it is sitting at the top of this loop. As the cars move down, the potential energy changes into energy of motion.

1. How far did she travel in total?

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For a constant voltage, increasing the resistance will cause the current to decrease. true or false

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A passenger jet flies from one airport to another 1,273 miles away in 2.2 h. find its average speed.

Wich statement best describe why an island food web could be considered a closed system