Jane's brother andrew leaves home for school at 8: 00 am. he walks at 3.3 kph. at 8: 20 am jane discovers that andrew has left his homework at home. she decides to follow him on her bicycle and give him his homework, but she wants to be back home in time for an online test at 9 am. what is the minimum constant speed at which she needs to ride? (hint: at what time of day will they meet? ) jane must ride at least kph.

8;30
i think hope i helped

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 -