Answer
$2.1\times10^{12} \ Nm$
Work Step by Step
We know the equation for torque:
$\tau = rFsin\theta$
We found the force to be $6.64\times10^{10}N$ in problem 42. Since the integral of $r^2$ is $\frac{r^3}{3}$, we know that the radius should be divided by three, for $\frac{r^3}{3r^2}=\frac{r}{3}$. The angle is 90 degrees, so we obtain:
$\tau = (\frac{95}{3})(6.64\times10^{10})sin90^{\circ}=2.1\times10^{12} \ Nm$
