Question

The power developed, when a force f=(i+2j–k)N, acting on a body producing a velocity v=(-i+j-ak)it is found to be 3watt . find value of a.​

Answer 1

Answer:

Value of constant a is 2

Explanation:

As we know that mechanical power is defined as rate of work done

so we will have

$P = \frac{dW}{dt}$

so we have

$P = \vec F. \vec v$

so we have

$P = (\hat i + 2\hat j - \hat k). (-\hat i + \hat j - a\hat k)$

$P = -1 + 2 + a$

given that P = 3 W

so we have

$3 = 1 + a$

$a = 2$

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Topic : Power

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