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The number of revolutions, a wheel of diameter 40cm makes in travelling a distance of 176m is

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150

166

160

140

answer is A.

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Detailed Solution

$r = 20 cm = 20 \times 10^{- 2} m$

s=176 m

Revolution $= 2 πr = 2 \times \frac{22}{7} \times 10^{- 2} = 1.257 m$

Number of revolutions $= \frac{176}{1.257} = 140$

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