A steel (E=30 X 10^6 psi) bar having a cross-sectional area of0.375 in^2 is mounted as shown in the figure. The spring has aspring constant of 10,000 lb/in. If the nominal coefficient ifthermal expansion is 6 X 10^-6 in./(in.-F), the increase in force(lb) produced in the bar by a temperature increase of 300 F is mostnearly:

A. 24

B. 324

C. 624

D. 724

Is there a way to post the Figure? If not, it is basically asteel rod (length = 3ft) attached to a wall by a spring on ahorizontal plane.