If $\vec{F}=(120 \hat{i}+30 \hat{j}-6 \hat{k}) \mathrm{N}$ and $\vec{v}=(2 \hat{i}-4 \hat{j}+5 \hat{

Question

If $\vec{F}=(120 \hat{i}+30 \hat{j}-6 \hat{k}) \mathrm{N}$ and $\vec{v}=(2 \hat{i}-4 \hat{j}+5 \hat{k}) \mathrm{m} / \mathrm{s}$, then instantaneous power is\

Professor PC Thomas Classes · Answer

$P=\vec{F} \cdot \vec{v}=(120 \hat{i}+30 \hat{j}-6 \hat{k}) \cdot(2 \hat{i}-4 \hat{j}+5 \hat{k})$\ $=90$ watts