Question

If the density of the earth is to remain constant and earth contracts to half of its p radius, duration of the day will be 1) 45 minutes 2) 80 minutes 3) 6 hours 4) 18 hours ...


please answer it quickly it's urgent​

Answer 1

3 is the answer

Suggest inclusion of additional arrangement(s) containing

unicellular organisms to make the plant more effective functionally

as sewage treatment centre.