A satellite is orbiting at a height of 2.6 x 106m above the surface of the earth. If it has an angular speed of 3.0 x 10-3 rad/s, what is its tangential speed?

The answer is 12, for the points

Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.

Well it depends on the object or substance

D. a  bar magnet with its south pole on the left