Chapter 11 - Section 11.3 - The Dot Product - Exercises - Page 617: 42

$3.643\times 10^{11}\ J$

If a constant force ${\bf F}$ acts through a displacement ${\bf D}=\vec{PQ}$ the work done is ${\bf W}={\bf F}\cdot{\bf D}$ --- Placing San Francisco at the origin, and Los Angeles on the positive x-axis, we have ${\bf D}$=$\langle 605000\ m,\ 0\ m\rangle \quad {\bf F}=\langle 602148\ N,\ 0\ N\rangle$ ${\bf W}=(602148\ N)(605000\ m)=3.643\times 10^{11}\ Nm$ $=3.643\times 10^{11}\ J$