How many times will a wheel of radius 7 mts be rotated to travel 880 m

1.	How many times will a wheel of radius 7 mts be rotated to travel 880 mts? A) 30 B) 20 C) 25 D) 24
Answer» Correct option is B) 20 Radius of wheel is r = 7m \(\therefore\) circumference of wheel is P = 2 π r = 2 π x 7 = 14π m \(\because\) Distance travel by wheel in one rotation = 14 π m \(\therefore\) Number of rotation required to travel distance of 14π m = 1 \(\therefore\) Number of rotation required to travel distance of 880 m = 1/14π x 880 = \(\frac{7}{14\times22}\times880=\frac{7\times40}{14}=\frac{40}2=20\)

How many times will a wheel of radius 7 mts be rotated to travel 880 mts? A) 30 B) 20 C) 25 D) 24

Answer»

Correct option is B) 20

Radius of wheel is r = 7m

\(\therefore\) circumference of wheel is P = 2 π r = 2 π x 7 = 14π m

\(\because\) Distance travel by wheel in one rotation = 14 π m

\(\therefore\) Number of rotation required to travel distance of 14π m = 1

\(\therefore\) Number of rotation required to travel distance of 880 m

= 1/14π x 880 = \(\frac{7}{14\times22}\times880=\frac{7\times40}{14}=\frac{40}2=20\)