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Q.

How many times a wheel of radius 7 cm must rotate to go 220 m.

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a

400

b

200

c

300

d

500

answer is D.

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Detailed Solution

r = 7 c m

$c i r c u m f e r e n c e = 2 π r = 2 \times \frac{22}{7} \times 7 = 44 c m$

No. of rotations $= \frac{220 \times 100}{44} = 500$

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