A stonemason drags a marble block across a floor by pulling on a rope attached to the block as illustrated in the figure. The block is not necessarily in equilibrium. According to Newton's 3rd law, which case of the
following isn't considered an action-reaction pair?
200-
46.02.2
A) Force of rope on block - Force of block on rope
B) Force of block on ground - Force of ground on block
C) Force of mason on rope - Force of rope on mason
D) Force of block on rope - Force of mason on rope

To understand the electric potential and electric field of a point charge in three dimensions consider a positive point charge q, located at the origin of three-dimensional space. throughout this problem, use k in place of 14? ? 0. part adue to symmetry, the electric field of a point charge at the origin must point from the origin.answer in one word.part bfind e(r), the magnitude of the electric field at distance r from the point charge q.express your answer in terms of r, k, and q. part cfind v(r), the electric potential at distance rfrom the point charge q.express your answer in terms of r, k, and q part dwhich of the following is the correct relationship between the magnitude of a radial electric field and its associated electric potential ? more than one answer may be correct for the particular case of a point charge at the origin, but you should choose the correct general relationship. a)e(r)=dv(r)drb)e(r)=v(r)rc)e(r)=? dv(r)drd)e(r)=? v(r)r