(a) For the configuration in Problem 4.5, calculate the force on P2 due to P1, and the force on P1 due to P2. Are the answers consistent with Newton's third law?

(b) Find the total torque on P2 with respect to the center ofpl, and compare it with the torque on Pl about that same point. [Hint: combine your answer to (a) with the result of Prob. 4.5.]