Answer
3100 N
Work Step by Step
Let's apply equation 11.5 to find the force applied to the car.
$\frac{F_{1}}{A_{1}}=\frac{F_{2}}{A_{2}}$ ; Let's plug known values into this equation.
$\frac{F_{1}}{\pi r_{1}^{2}}=\frac{F_{2}}{\pi r_{2}^{2}}=>F_{2}=F_{1}(\frac{r_{2}^{2}}{r_{1}^{2}})$
$F_{2}=45\space N\times(8.3\space N)^{2}=3100\space N$
