Tiêu đề DPP-9 SOLUTION.pdf ✅

1 VSD = 29 30 MSD L. C. = 1 MSD − 1 VSD = (1 − 29 30) MSD = 1 30 × 0.5° = 1 minute 17 (d) [Pressure]=[Stress ]=[coefficient of elasticity] =[ML−1T −2 ] 18 (a) I = Q t = [Q] [T] = [M0L 0T −1Q] 19 (c) T = 2π√l/g ⇒ T 2 = 4π 2 l/g ⇒ g = 4π 2 l T 2 Here, % error in l = 1mm 100cm × 100 = 0.1 100 × 100 = 0.1% And % in error in T = 0.1 2×100 × 100 = 0.05% ∴ % error in g = % error in l + 2(% error in T) = 0.1 + 2 × 0.05 = 0.2 % 20 (d) The number of significant figures in 4.8000 × 104 is 5 (zeros on right after decimal are counted while zeros in powers of 10 are not counted). The number of significant figures in 48000.50 is 7 (all the zeros between two non-zero digits are significant).