Fundamentals of Engineering Thermodynamics 8th Edition

Published by Wiley
ISBN 10: 1118412931
ISBN 13: 978-1-11841-293-0

Chapter 1 - Problems: Developing Engineering Skills - Page 30: 1.11

Answer

Here , in this question, clearly, The force applied to the spring that cause it to elongate can be expressed as . F = kx The applied force is due to the weight of the pumpkin, which can be expressed as the mass (m) of the pumpkin times acceleration of gravity, (g). F = Weight = mg = kx Solving for elongation, x, substituting values for pumpkin mass, acceleration of gravity, and spring constant, and applying the appropriate conversion factor gives us x= mg/k = ( 125 lb)/ 4.7 (lbf/in.))$\times$(32.2 ft/$s^{2}$)$\times$(1 lbf/32.174 lb.ft/$s^{2}$) = 2.66 in.

Work Step by Step

Here , in this question, clearly, The force applied to the spring that cause it to elongate can be expressed as . F = kx The applied force is due to the weight of the pumpkin, which can be expressed as the mass (m) of the pumpkin times acceleration of gravity, (g). F = Weight = mg = kx Solving for elongation, x, substituting values for pumpkin mass, acceleration of gravity, and spring constant, and applying the appropriate conversion factor gives us x= mg/k = ( 125 lb)/ 4.7 (lbf/in.))$\times$(32.2 ft/$s^{2}$)$\times$(1 lbf/32.174 lb.ft/$s^{2}$) = 2.66 in.
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