Chapter 14.2, Problem 46E

Work integrals in ${ℝ}^3$ Given the force field F, find the work required to move an object on the given oriented curve.

46. $F=\frac{\langle x,y,z\rangle }{x^2+y^2+z^2}$ on the line segment from (1, 1, 1) to (8, 4, 2)