Problem 12.57 The mobile in the figure is in equilibrium. Object B has mass of 0.760 kg . 30.00 cm 7.50 cm 15.00 cm 5.00 cm 17.50 cm 5.00 cm D Part A Determine the mass of the object A. (Neglect the weights of the crossbars.) ANSWER: та 3 kg Part B Determine the mass of the object C. (Neglect the weights of the crossbars.) ANSWER: kg Part C Determine the mass of the object D. (Neglect the weights of the crossbars.)

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