Use the redlich-kwong equation to plot the compressibility factor, z, against p for methane for t 180 k, 189 k, 190 k, 200 k, and 250 k. hint: calculate z as a function of v and p as a function of v, and then plot z versus p.

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?