A ballistic pendulum is used to measure the speed of high-speed projectiles. A bullet A weighing 22 g is fired into a 2.6-kg wood block B suspended by a cord of length l = 2.2 m. The block then swings through a maximum angle of θ = 60°. Determine the initial speed of the bullet v0.

initial velocity of bullet = 50.72m/s

Explanation:

Detailed explanation and calculation is shown in the image below.

NB: the wooden block has an initial velocity u = 0 since it was at rest.

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 -

Ithink they do have the same properties just in less quantities i think