Which combination of elements below will bond ionically and in the same ratio as potassium when it bonds to oxygen? *
carbon and oxygen
O cesium and sulfer
calcium and nitrogen
O magnesium and oxygen
sodium and chlorine

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The energy equivalent of the rest mass of an electron is

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600