The motorcyclist in Figure wants to jump over "N" cars of height "h" and width "d". To do this, he will use an inclined ramp (´ that does not have friction) at an angle "α" and of height "H". The motorcyclist enters the ramp with a speed "v0" and climbs it without accelerating (since he cannot, due to the absence of friction). You are asked to calculate the minimum speed with which the motorcyclist must enter the ramp, if he wishes to jump over 14 cars arranged as shown in the Figure. The numerical values for the variables are: h = 1 m H = 12 m α = 45◦ d = 2 m

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 it’s: light bounce if off a mirror

F  you double the  force, you double the acceleration, but  if  you double the  mass, you velocity. all bodies accelerate at the  same  rate regardless of size or  mass.