Ball bearings are used in bicycles, cars, etc., because

1.	Ball bearings are used in bicycles, cars, etc., because
A.	the actual area of contact between the wheel and axle is increased
B.	. the effective area of contact between the wheel and axle is increased
C.	. the effective area of contact between the wheel and axle is reduced
D.	None of the above statements is correct
Answer» D. None of the above statements is correct

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Ball bearings are used in bicycles, cars, etc., because

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