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14. A small cart is being driven at 10 km per hour. If
each wheel is 91 cm in diameter, find the number of
revolutions made by each wheel per minute.
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Speed of the cart = 10km/hr
= 10×1000/60 m/ min = 1000/6 m/min.
Diameter of the wheel = 91 cm= 0.91 m
Radius of the wheel = 0.91/2 m
Circumference of the wheel= 2πr
= 2 × (22/7) × (0.91/2) m= 22×0.13 m
No.of revolutions per minute= (1000/6)/(22×o.13) = 1000×100/(6×22×13)
= 1000×25/429
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