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The radius of each of the wheels of a bus is 30 cm. How many complete revolutions does each wheel make in 8 minutes if the bus is traveling at a speed of 45 kmph?1). 30922). 32683). 35614). 3727 |
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Answer» Number of Revolutions = Total DISTANCE/Distance covered in 1 revolution Distance covered in 1 revolution = Circumference of wheel = 2πr = 2 × π × 30 = 60π ⇒ Speed = Distance/Time ⇒ 45 = Distance/(8/60) ⇒ Distance = 90/15 = 6 km ∴ Number of Revolutions = 600000/60π = 3184.71 ≈ 3184 |
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