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Why do Helium and Neon have little to no reactivity?

What kind of simple machine is a catapult?

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.