If radius of the earth contracts to half of its present value without change in its mass, what will be the new duration of the day?

Options

A. `6 h`
B. `12 h`
C. `48 h`
D. `96 h`

Explanation

`(2)/(5)mr^(2)omega=(2)/(5)m((r )/(2))^(2)omega_(2)`
`omega_(2)=4omega`
`(2pi)/(T_(2))=4xx(2pi)/(24)`
`T_(2)=6h`