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Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.PowerEasy2 minPYQ_2020

PhysicsEasysingle choice

The force required to row a boat over the sea is proportional to the square of the speed of the boat. It is found that it takes $24 hp$ to row a certain boat at a speed of $8 k m {hr}^{- 1}$ , the horsepower required when speed is doubled

Options:

Answer:

Solution:

Given,

$F \propto v^{2}$

As power is given by

$P = F v$

Therefore

$P \propto v^{3}$

$\frac{P_{2}}{P_{1}} = {(\frac{v_{2}}{v_{1}})}^{3}$

$\frac{P_{2}}{24} = {(\frac{2 v}{v})}^{3}$

$\frac{P_{2}}{24} = 8$

$P_{2} = 192 hp$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:W.E.P.Subtopic:Power

⏱ 2mℹ️ Source: PYQ_2020

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