Question

if suddenly the earth is expanded to double of its initial radius, what will be duration of the day​

Answer 1

Answer:

The duration will increase drastically to 96 Hours

Explainations:

Here, D2=2D1(Because earth has expanded twice)∴R2=2R1(Because earth has expanded twice)

T1=1day=24hr,T2=?

According to the law of conservation of angular

momentum, I2ω2=I1ω1

25mR22(2πT2)=25mR21(2πT1)

T2=T1(R2R1)2=24(2)2=96hours