Significant Figures in Addition · PhysicsBowl 2017 #17

Physics · mechanics

Problem

The following lengths are added together: L1=8.36×101L_1 = 8.36×10^1 m, L2=9.20×102L_2 = 9.20×10^2 m, L3=1.39×10−1L_3 = 1.39×10^{-1} m, and L4=2.1×100L_4 = 2.1×10^0 m. How many significant digits are in the resulting sum? (A) 2 (B) 3 (C) 4 (D) 5 (E) 7

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