Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 7 - Linear Momentum - General Problems - Page 196: 74

Answer

a) $6.25\times10^{-13}\frac{m}{s}$ b) $2.50\times10^{-17}$ c) $1.17J$

Work Step by Step

a) $m_Mv_M+m_Ev_E=v_{ME}m_{ME}$ $v_{ME}=\frac{m_Mv_M+m_Ev_E}{m_{ME}}=\frac{(1.5\times10^8kg)(25000\frac{m}{s})}{6.0\times10^{24}kg}$ $=6.25\times10^{-13}\frac{m}{s}$ b) $E_{KM}=\frac{(1.5\times10^8kg)(25000\frac{m}{s})^2}{2}=4.68\times10^{16}J$ $E_{KE}=\frac{(6.0\times10^{24}kg)(6.25\times10^{-13}\frac{m}{s})^2}{2}=1.17J$ $\frac{1.17J}{4.68\times10^{16}J}=2.50\times10^{-17}$ c) $E_{KE}=1.17J$
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