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If the polar ice of earth gets melted then length of a day on earth will be A. Longer B. Shorter C. Unchanged D. 6 hrs.

If the polar ice of earth gets melted then length of a day on earth will be 
A. Longer B. Shorter C. Unchanged D. 6 hrs.

Grade:12th pass

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
4 years ago
Earth rotates about its polar axis. When ice of polar caps of earth melts, mass concentrated near the axis of rotation spreads out. Therefore, the moment of inertia I increases.

As no external torque acts,

L=I omega = I(2π/T) = constant

With increase of I,T will increase i.e length of the day will increase


Vikas TU
14149 Points
4 years ago
If the ice on the polar caps melts, it will distribute the ice now at the poles all around the planet causing a change in the distribution of mass. The classic example of this would be an ice skater who opens their arms to come out of a spin. An earth where the ice caps had melted into the oceans would have its mass further from the axis of rotation , causing the rotation to slow. This means that the earth would then have longer days.

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