Which is larger a food web or a food chain

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this

If we decrease the amount of force and keep all other factors the same what will happen to the amount of work