Problem 1-12| General Principles| Engineering Mechanics: Statics| RC Hibbeler

Convert each of the following and express the answer using an appropriate prefix: (a) 175 lb/ft³ to kN/m³, (b) 6 ft/h to mm/s, and (c) 835 lb·ft to kN·m. Continue reading “Problem 1-12| General Principles| Engineering Mechanics: Statics| RC Hibbeler”

Problem 1-9| General Principles| Engineering Mechanics: Statics| RC Hibbeler

A rocket has a mass of 250(10³) slugs on earth. Specify (a) its mass in SI units and (b) its weight in SI units. If the rocket is on the moon, where the acceleration due to gravity is g_m=5.30\:ft/s^2, determine to three significant figures (c) its weight in SI units and (d) its mass in SI units.

Continue reading “Problem 1-9| General Principles| Engineering Mechanics: Statics| RC Hibbeler”

Problem 1-3| General Principles| Engineering Mechanics: Statics| RC Hibbeler


Represent each of the following combinations of units in the correct SI form using an appropriate prefix: (a) kN/μs, (b) Mg/mN, and (c) MN/(kg•ms).


Solution:

Part A

\displaystyle kN/\mu s=\frac{\left(10^3\right)N}{\left(10^{-6}\right)s}=10^9\:N/s=GN/s

Part B

\displaystyle Mg/mN=\frac{\left(10^6\right)g}{\left(10^{-3}\right)N}=10^9\:g/N=Gg/N

Part C

\displaystyle MN/\left(kg\cdot ms\right)=\frac{10^6\:N}{kg\cdot \left(10^{-3}\right)s}=10^9\:\frac{N}{kg\cdot s}=GN/\left(kg\cdot s\right)


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