Convert: (a) 200 lb·ft to N·m, (b) 350 lb/ft3 to kN/m3, (c) 8 ft/h to mm/s. Express the result to three significant figures. Use an appropriate prefix.
Statics of Rigid Bodies 14th by RC Hibbeler, Problem 1-4
Solution:
Part A
200 lb⋅ft=(200 lb⋅ft)(1 lb4.4482 N)(1 ft0.3048 m)=271 N⋅m
Part B
350 lb/ft3=(1 ft3350 lb)(0.3048 m1 ft)3(1 lb4.4482 N)(1000 N1 kN)=55.0 kN/m3
Part C
8 ft/hr=(1 hr8 ft)(3600 s1 hr)(1 ft0.3048 m)(1 m1000 mm)=0.677 mm/s
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