Physics

# Which one of the following is not measured in the units of energy?

Impulse$\times$Time

##### SOLUTION
Energy $= M^{1} L^{2} T^{-2}$

Couple $\times$  (angle turned through) $=\vec{r} \times \vec{f}\times \theta = (L^{1}) (M^{1} L^{1} T^{-2}) (M^{0} L^{0} T^{0})=M^{1} L^{2} T^{-2}$

(Moment of Inertia) $\times$  (Angular velocity$)^{2}= (MR^{2}) \times (\omega ^{2}) = (M^{1}) (L^{2})(T^{-2})= M^{1} L^{2} T^{-2}$

Force $\times$ distance $= M^{1} L^{1} T^{-2} \times L^{1} = M L^{2} T^{-2}$

Impulse $\times$ time $= (f\times t) \times t = M^{1} L^{1} T^{-2} \times T \times T=M^{1} L^{1} \rightarrow$ not a unit of energy

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Single Correct Medium Published on 18th 08, 2020
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