Rubber bands are used in physical therapy to provide resistance to motion. For a band that is 0.07 inches thick and 2.5 inches wide, with E = 120 psi and ν = 0.47. (a) If a force of 4 lbs is applied to an 18 inch long strip, what is the change in the strip's width and thickness? (b) Find both engineering and true strains for the band.