Why do earth rotate on axis.? Scientific reason please..
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Ritamsamantaray:
as earth rotates about its axis day and night occurs.thats why it rotates
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Earth has magnetic field with North & South Poles. The axis of rotation is different from the magnetic poles. This difference creates force for the earth to rotate on its axis. The same is the case with all planets in the Solar System. Moon doesn't have Magnetic field; hence it does not rotate on its axis.
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factor is the earth's "moment of inertia", a concept like mass but related to rotations rather than linear motion. Try this: spin round on a swivel chair, then spread out your arms and you will notice that your rotation slows. Bring your arms in and the rotation will speed up again. With your arms outspread, you have more mass at a distance from your axis of rotation, so your moment of intertia increases. Now angular momentum = moment of intertia x speed of rotation, but this quantity is conserved (if we ignore the friction that eventually stops the chair spinning), so your speed of rotation must drop. If the earth became more oblique or if geological events redistributed its dense iron core to shallower depths, then the earth would rotate more slowly.
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I just needed a reason why you gave example
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