A non-uniform wooden beam 8-m long is placed on a pivot 2.0 m from the lighter end of the beam. The center of gravity of the beam is located 2.0 m from the heavier end. If placing a 500 N weight on the lighter end of the beam balances the beam, what must be the weight of the beam? a. 125 N b. 250 N c. 500 N d. 1000 N