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the radius of the wheels of a bus is 70 cm, how many revolutions per minute must a wheel make in order to move at a speed of 66 km/hr? |
| Speed of the wheel = 66 km / hr Therefore, Distance covered by the wheel in one minute =66 x 1000 x 100) / 60 cm = 110000 cm Diameter of the wheel = 140 cm; Hence, its radius = 70 cm Circumference of the wheel = 2 ? r = 2 X 22/7 X 70 = 440 Therefore, Number of revolutions made by the wheel in 1 minute = Total distance traveled / circumference = 110000 / 440 = 250 |
