Question

If the earth expands suddenly to twice it's radius,the duration of the day will
become

Answer 1

The duration will remain as it is, 23 hours and 56 minutes.

The question to be considered is, during this expansion, will the rotation rate modify or not?

As long as the rotation rate remains the same, no problem. Decrease/Increase in rotation rate will Increase/Decrease the duration of a day.

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Answer 2

Answer:

Explanation:

(i) If the value of g becomes double,the force with

which the earth pulls the object i.e weight of

object becomes double.

(ii) As weightincreases,frictional force also increases

while pulling the object

( iii) Hence, it will become two times more difficult to

pull a heavy object along the floor.