A 200. kg box is pulled at constant speed by the little engine pictured below.  The box moves a distance of 2.5 m across a horizontal surface.          

a)    Draw a force diagram of all relevant forces acting on the box.   
   
b)    Construct a qualitative energy bar graph/flow diagram for this situation.  Be sure to specify your system.

c)    How much energy is transferred by the engine?

d)    What type of motion would occur if the engine pulled with a force of 500 N?
    Modify your force diagram and apply Newton's 2nd Law.

Charles darwin marked the difference among countless finches on the galápagos islands.i hope i !

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 -

B) as the temperature increases, the kinetic energy of the particles increases.|-/