College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

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Two cups are placed on a uniform board that is balanced on a cylinder (Fig.). The board has a mass of 2.00 kg and is 2.00 m long. The mass of cup 1 is 200 g and it is placed 1.05 m to the left of the balance point. The mass of cup 2 is 400 g. Where should cup 2 be placed for balance (relative to the right end of the board)

FIGURE A Don't let it roll See Exercise.