You are using a wrench and trying to loosen a rusty nut. Which of the following arrangements is most effective in loosening the nut? List in order of descending efficiency the following arrangements:
A. 1234
B. 2(14)3
C. 2143
D. 2413
E. 4321


You are trying to open a door that is stuck by pulling on the doorknob in a direction perpendicular to the door. If you instead tie a rope to the doorknob and then pull with the same force, is the torque you exert increased?