1. A 180 kg motorcycle travels in a straight line on a horizontal road. The relationship between motorcycle's velocity and time are given by the above graph.
a.
What is the acceleration during the first 5 s?
b. What is the net force during first 5 s?
C.
What is the acceleration from 5 s to 10s?
d. What is the net force from 5 s to 10 s?
e
What is the acceleration from 10 s to 15 s?
f.
What is the net force from 10 s to 15 s?
9
What is the acceleration from 15 s to 25s?
h. What is the net force from 15 s to 25 s?

Eh not really sure bout this one

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 -

Because the sun is the biggest and if the sun orbits the earth we will be dead probably