During the past 150 years in the united states, how did energy consumption compare to population growth

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

Metals are good conductors of electricity because they

Bonds within one water molecule are examples of