An express train is running between two stations with the uniform speed. if the diameter of each wheel of train is 42cm and each wheel makes 1200 revolutions per minutes. Find the speed of the train.
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radius = diameter/2 = 42/2 = 21cm =0.21m
no.of revolutions in a minute= 1200
=>no of revolutions per second = 1200/60=20
perimeter of the wheel= 2πr = 2×3.14 × 0.21= 1.319m
speed = distance per revolution× revolutions per second=1.319×20=26.38m/s
no.of revolutions in a minute= 1200
=>no of revolutions per second = 1200/60=20
perimeter of the wheel= 2πr = 2×3.14 × 0.21= 1.319m
speed = distance per revolution× revolutions per second=1.319×20=26.38m/s
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