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Physics · WORK, ENERGY AND POWER

हिन्दी

Given below are two statements regarding power: Statement I: Instantaneous power can be expressed as the scalar product of force vector and instantaneous velocity vector, \( P = \mathbf{F} \cdot \mathbf{v} \). Statement II: Power is a vector quantity having dimensions \( [\text{M L}^2 \text{T}^{-3}] \). In the light of the above statements, choose the most appropriate answer from the options given below:

  1. A
    Both Statement I and Statement II are correct.
  2. B
    Both Statement I and Statement II are incorrect.
  3. C
    Statement I is correct but Statement II is incorrect.
  4. D
    Statement I is incorrect but Statement II is correct.
View Answer & Solution

Correct answer · Option C

Statement I is correct but Statement II is incorrect.

Explanation

Statement I is correct since \( P = \frac{dW}{dt} = \mathbf{F} \cdot \frac{d\mathbf{r}}{dt} = \mathbf{F} \cdot \mathbf{v} \). Statement II is incorrect because power is a scalar quantity, even though its dimensions are indeed \( [\text{M L}^2 \text{T}^{-3}] \).
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