The number of revolutions made by a circular wheel of radius 0.7m in rolling a distance of 176m is
(a) 22 (b) 24 (c) 75 (d) 40
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Last updated at Sept. 6, 2021 by Teachoo
Transcript
Question 15 The number of revolutions made by a circular wheel of radius 0.7m in rolling a distance of 176m is (a) 22 (b) 24 (c) 75 (d) 40 Here, Number of revolutions = (๐ป๐๐๐๐ ๐ ๐๐๐๐๐๐๐)/(๐ซ๐๐๐๐๐๐๐ ๐๐๐๐๐๐๐ ๐๐ ๐ ๐๐๐๐๐๐๐๐๐๐) Given Radius = 0.7 m, Total Distance = 176 m Therefore, Distance covered in one revolution = Circumference of wheel = 2๐r = 2 ร ๐ ร 0.7 = 2 ร 22/7 ร 0.7 = 2 ร 22 ร 0.1 = 4.4 m Now, Number of revolutions = (๐๐๐ก๐๐ ๐๐๐ ๐ก๐๐๐๐)/(๐ท๐๐ ๐ก๐๐๐๐ ๐๐๐ฃ๐๐๐๐ ๐๐ 1 ๐๐๐ฃ๐๐๐ข๐ก๐๐๐) = 2 ร ๐ ร 0.7 = 176/(44/10) = (176 ร 10)/44 = 40 So, the correct answer is (d)
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