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: 78

Answer

a) $v_A=1.7\frac{m}{s}$ b) $v'_B=1.37\frac{m}{s}$ $v'_A=-0.303\frac{m}{s}$ c) $h_A=0.0047m$ $h_B=0.096m$

Work Step by Step

a) $h_A=35\cos(66^o)=0.142m$ $v_A=\sqrt{2gh}=\sqrt{2(9.8\frac{m}{s^2})(0.142m)}=1.7\frac{m}{s}$ b) $(0.045kg)(1.67\frac{m}{s})=(0.045kg)v'_A+(0.065kg)v'_B$ $v'_A=\frac{(0.045kg)(1.67\frac{m}{s})-(0.065kg)v'_B}{(0.045kg)}=1.67\frac{m}{s}-1.44v'_B$ $(0.045kg)(1.67\frac{m}{s})^2=(0.045kg)(1.67\frac{m}{s}-1.44v'_B)^2+(0.065kg)(v'_B)^2$ $v'_B=1.37\frac{m}{s}$ $v'_A=-0.303\frac{m}{s}$ c) $h=\frac{v^2}{2g}$ $h_A=\frac{(-0.303\frac{m}{s})^2}{2(9.8\frac{m}{s^2})}=0.0047m$ $h_B=\frac{(1.37\frac{m}{s})^2}{2(9.8\frac{m}{s^2})}=0.096m$
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