Question

what will happen if earth become s twice of its radius?

Answer 1

Inertia of earth increases
Gravity of the earth decreases
Torque of the earth increases
Velocity of the earth increases.....

Answer 2

 Earth’s radii doubled but density was similar to the old Earth, the planet’s mass would go up and gravity would be twice as strong. That would instantly make your weight twice as much as it was before.

We would become much slower. It would be difficult to walk or jump, let alone run.

Evolution would accelerate and natural selection would take place. In general, animals would also become shorter and sturdier. 

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