10-19 How much work is done in separating an electron (q = -1.6 × C) from an oxygen nucleus (Q = +1.3x 10-18 C) from a distance of 2.0 μm? Recall: (k = 8.99 x 109 Nm2/C2) F(r) = 1Q kQq r2

Plant Growth Researchers have found that the probability P that a plant will grow to radius R can be described by the differential equation dPdR=4DRP2 where D is the density of the plants in an area. Source: Ecology. Given the initial condition P(0)=1, find a formula for P in term of R.