An electric winch pulls an 875 N crate up a 15° incline at 0.25 m/s. The coefficient of friction between the
crate and incline is 0.45.
a. What power does the winch develop?
b. How much electrical power must be delivered to
the winch if it is 85 percent efficient?
Please someone help...?

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

The answer is d) by requesting advice on science internet sites

The speed was not exceeded so it was slow