1 AP Physics Statics Practice Test Answers: A,B,A,E,D,A,A,B,B,E,B,E ...

_____10. A rod of negligible mass is pivoted at a point that is off-center, so that length l 1 is differentfrom length l 2 . The figures above show two cases in which masses are suspended from the ends ofthe rod. In each case the unknown mass m is balanced by a known mass, M 1 or M 2 , so that the rodremains horizontal. What is the value of m in terms of the known masses?(A) M l + M 2 (B) ½(M l + M 2 ) (C) M lM 2 (D) ½M 1 M 2 (E) M 1M 2!_____11. Calculate the mass M1 for the system shown below to be balanced. L1 = 3.0 m, L2 = 1.5 m,L3 = 3.5 m, M2 = 45 kg, M3 = 28 kg. The mass of the board is 80 kg, the length of the board is 8 m,and L3 is measured from the fulcrum to the right end of the board.L3L1M1 L2 M2 M3A. 25.0 kg.B. 41.8 kg.C. 55.2 kg.D. 125.5 kg.E. 165.5 kg.______12. The Normal force of the fulcrum on the board in the above problem isA. 1744 N.B. 1500 N.C. 1125 N.D. 2040 N.E. 1909 N.4