Charge q is 1 unit of distance away from the source charge s. charge p is four times further away. the force exerted between s and q is the force exerted between s and p.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

one centimetre is equal to 0.01 metres

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times