## Engineering Mechanics: Statics & Dynamics (14th Edition)

Published by Pearson

# Chapter 1 - General Principles - Problems - Page 15: 1

#### Answer

a) 78.48 N b) 0.39 N c) 7,455,600 N

#### Work Step by Step

a) $W=m*g$ $m = 8 kg$ $g = 9.81 \frac{m}{s^{2}}$ $W=(8kg)(9.81\frac{m}{s^{2}})$ $1N=1\frac{kg*m}{s^{2}}$ $(8)(9.81)=78.48$ $W=78.48N$ b) $W=m*g$ $m = 0.04 kg$ $g = 9.81 \frac{m}{s^{2}}$ $W=(0.04kg)(9.81\frac{m}{s^{2}})$ $1N=1\frac{kg*m}{s^{2}}$ $(.04)(9.81)=.3924$ $W=.39N$ c) $W=m*g$ $m = 760 Mg$ $1Mg=1000kg$ $m=760,000 kg$ $g = 9.81 \frac{m}{s^{2}}$ $W=(760,000kg)(9.81\frac{m}{s^{2}})$ $1N=1\frac{kg*m}{s^{2}}$ $(760,000)(9.81)=7,455,600N$ $W=7,455,600N$

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