Chapter 7, Problem 11Q

In three situations, a single force acts on a moving particle. Here are the velocities (at that instant) and the forces: (1) $\stackrel{\to }{v}$= (−4 $\hat{i}$) m/s, $\stackrel{\to }{F}$= (6 $\hat{i}$− 20 $\hat{j}$) N; (2) $\stackrel{\to }{v}$ = (2 $\hat{i}$− 3 $\hat{j}$) m/s, $\stackrel{\to }{F}$ = (−2 $\hat{j}$ + 7 $\hat{k}$) N; (3) $\stackrel{\to }{v}$ = (−3 $\hat{i}$ + j) m/s, $\stackrel{\to }{F}$ = (2 $\hat{i}$ + 6 $\hat{j}$) N. Rank the situations according to the rate at which energy is being transferred, greatest transfer to the particle ranked first, greatest transfer from the particle ranked last.