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Circumference of a Circle

The radius of...

Question

The radius of a wheel is 0.25 m. How many revolutions will it make in covering 11 km ?

(a) 2800 (b) 4000 (c) 5500 (d) 7000

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Solution

Radius $= 0.25 m$

Circumference $= 2 π r = 2 \times \frac{22}{7} \times 0.25 m$

No:of revolutions $= \frac{total distance}{circumference}$

$= \frac{11000 \times 7}{2 \times 22 \times 0. 25} = 7000$ revolutions

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