If the earth suddenly contracts to one third of its present size, calculate by how much would the day be shortened ?

If the earth suddenly contracts to one third of its present radius, how much would the day be shortened ?

If the earth suddenly contracts by one-fourth of its present radius, by how much would the day be shortened?

Mass remaining constant, if the earth suddenly contracts to one third .of its present radius, the length of the day would be shortened by

Mass remaining constant, if the earth suddenly contracts to one third of its present radius, the length of the day would be shorted by

If earth suddenly contracts by 1/2 of its present radius by how much would the day be decreased ?

If the earth suddenly contracts to one third of its present size without any change in its mass, the ratio of the kinetic energies of the earth after and before contraction will be

If earth suddenly contracts to 0.5 times of its present radius, then the length of the day becomes