At time tt = 0 a 2270 kgkg rocket in outer space fires an engine that exerts an increasing force on it in the +x+x-direction. This force obeys the equation Fx=At2Fx=At2, where tt is time, and has a magnitude of 781.25 NN when ttt = 1.49 ss.(a) Find the SI value of the constant A, including its units.
(b) What impulse does the engine exert on the rocket during the 1.50-s interval starting 2.00 s after the engine is fired?
(c) By how much does the rocket?s velocity change during this interval? Assume constant mass.

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 -

I’m not sure about this question

This ain't even a question. speak english