A wheel makes 500 revolutions in covering a distance of 44 km. Find the radius of the wheel.
Answer & explanation
Correct answer: option 1
Number of revolutions made by the wheel = 500
Distance covered by the wheel = 44 km
The distance covered by the wheel in one revolution = 2πr meters.
The distance covered by the wheel in 500 revolutions = 500 × 2πr meters.
We know that the distance covered by the wheel is 44 km = 44,000 meters.
500 × 2πr = 44,000
1000πr = 44,000
r = 14 m