making cars that get better gas mileage
not really sure but thinking 1.54 mm/us
there are many many of those. here are a few:
-- i get paid on my job.
-- dates numbered from 1 to 28 .
-- i receive a social security check.
-- i receive a small pension payment from bp.
-- i make payments on my home mortgage and car insurance.
-- if there is any balance due on my credit card, i pay that too.
note: any answer that says anything about the moon is incorrect. the moon's period of orbital revolution is 27.32 days, and the period of its full set of phases is 29.53 days, so there's nothing about the moon that always happens once and only once in a month. for example, there can be either one or two new moons or full moons in the same month, and although it's rare, mathematically difficult, and unusual, you can have a february with no new moon in it, or a february with no full moon in it.
radius of sphere
the distance between the centers of the two spheres is
the charge of the sphere
the magnitude of the repulsive force between the charges pushing them a part is
using coulomb law
hence, this is the required solution.