A force of ( 7 i ^ + 6 k ^ ) N makes a body move on a rough plane with a velocity of ( 3 j ^ + 4 k ^ ) m s - 1 . The power (in watt) delivered by the force is

Power, P ⁡ = F → · v → ⇒ P = 7 i ^ + 6 k ^ . 3 j ^ + 4 k ^ = 24 W

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PhysicsW.E.P.PowerEasy2 minPYQ_2020

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A force of $(7 \hat{i} + 6 \hat{k}) N$ makes a body move on a rough plane with a velocity of $(3 \hat{j} + 4 \hat{k}) m s^{- 1}$ . The power (in watt) delivered by the force is

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Answer:

Solution:

Power, $P = \vec{F} \cdot \vec{v}$

$\Rightarrow P = (7 \hat{i} + 6 \hat{k}) . (3 \hat{j} + 4 \hat{k}) = 24 W$

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

⏱ 2mℹ️ Source: PYQ_2020

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