## Physics (10th Edition)

a) 8.5 $\times$ $10^{4}$ N/m b) 290 N
a) $F_{app}$ = k$\Delta$x 670 = k(0.0079) k $\approx$ 8.5 $\times$ $10^{4}$ N/m b) $F_{app}$ = k$\Delta$x = 8.5 $\times$ $10^{4}$ $\times$ 0.0034 $\approx$ 290 N