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Relation between Linear and Angular Speed

A block moves...

Question

A block moves in uniform circular motion because a cord tied to the block is anchored at the centre of a circle. Then the power of the force exerted on the block by the cord is:

A

Positive

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B

Negative

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C

Zero

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D

Infinite

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Solution

The correct option is A Zero
$\to F$ and $¯ v$ are perpendicular
Power = $\to F$ . $¯ v$ = FV cos 90 $^{\circ}$ = Zero

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