His model was not accepted by ancient philosophers because they said (1) if earth is rotating, why can't we feel the the motion of earth, and (2) if earth is orbiting the sun, then the position should be different when it is on opposite side of the sun (parallax effect).

Ithink the answer would be 1,350!

The answer is frictional force

A. to determine if humans can explore mars safely

The modern-day generator works on the principle of electromagnetic induction discovered by michael faraday in 1831-32. faraday discovered that the above flow of electric charges could be induced by moving an electrical conductor, such as a wire that contains electric charges, in a magnetic field.