Joe is an athlete and ran today. His exercise heart rate is 130. His THRZ is 147-179 beats per minute. Mike is 200 pounds plus and walked today. His exercise heart rate
is 160 beats per minute. His THRZ is 152-182 bpm. Who was working harder and
how do you know?
a) Mike, he is within his target heart rate zone.
b) Joe, he is an athlete and works harder.
c) Mike and Joe, they are both in their target heart rate zone.
d) Joe, he is within his target heart rate zone.

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