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- 56. If (6.00 i – 8.00 j)m, B = (-8.00 i +3.00 j )m, and A = (26.0 i + 19.0 j )m , find the unknown constants a D +b B + A = 0. and b such that aA force of magnitude P = 169 N is applied to the stationary machine handle as shown. Write the force and moment reactions at O as vectors. Neglect the weight of the handle assembly. 150 mm 31% A 95 mm20. V How many significant figures are in the following numbers? (a) 78.9 + 0.2 (b) 3.788 × 10 (c) 2.46 x 10-6 (d) 0.005 3