Question

Find the power of a force F~ = (8 N)ˆı + (−4 N) ˆ if the velocity ~v = (−7 m/s)ˆı + (1 m/s) ˆ. Answer in units of W

Answer 1

Answer:

$P=-60W$

Explanation:

From the question we are told that

Force of power $F=8Ni+-4Nj$

Velocity of power $V=-7m/si+1m/sj$

Generally the equation for power is mathematically represented as

$Power=Force *Velocity$

$P=F *V$

Generally the dot product of F and V is mathematically given as

$P=$ $\begin{vmatrix}8 & -4\end{vmatrix} .$$\begin{vmatrix}-7 & 1\end{vmatrix}$  $=-56-4$

$P=-60W$