Which of the following situations would cause the greatest decrease in the motion of molecules in a system?
a. q = -50 j, w = -50 j
b. q = +50 j, w = +50 j
c. q = -50 j, w = +50 j
d. q = +50 j, w = -50 j

Option (A) is the correct answer.

Explanation:

A relation between energy, work and heat is as follows.

          = q + w

where     = energy

                            q = heat absorbed or released

                            w = work done

So, when q = -50 J then it means heat is released by the system and since w = -50 J hence, work is done by the system. That is, excess of energy is releasing from the system so, molecules are losing kinetic energy and acquiring potential energy.

Thus, we can conclude that a situation Q = -50 J, W = -50 J would cause the greatest decrease in the motion of molecules in a system.

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

neither accurate nor precise.