Significant Figures - Addition and Subtraction · PhysicsBowl 2015 #11

Physics · mechanics

Problem

Two length measurements are made and recorded as L1=84.55cmL_1 = 84.55 cm and L2=33.55cmL_2 = 33.55 cm. Two other length measurements are made and recorded as L3=1.750cmL_3 = 1.750 cm and L4=1.250cmL_4 = 1.250 cm. These measurements are used to compute the quantity (L1+L2)−(L3+L4)(L_1+L_2)-(L_3+L_4) using the rules of significant figures. Which one of the following choices best represents the correct result to this calculation? (A) 115.100 cmcm (B) 115.10 cmcm (C) 115.1 cmcm (D) 115 cmcm (E) 120 cmcm

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