Physics
Ball bearings are used in cycles, scooters etc to

Reduce the friction between the wheel and the axle
None of these
Increase the friction between the wheel and the axle
Reduce the friction between ground and the whee

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Acceleration in the orbit which is equal to the acceleration due to gravity outside
Absence of gravity outside
Presence of gravity outside but not inside the spacecraft
Fact that spacecraft in the orbit has no energy

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