Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 6 - Applications of Newton's Laws - Problems and Conceptual Exercises - Page 185: 96

Answer

$T_1=0.68KN$ $T_2=0.79KN$

Work Step by Step

We know that $\Sigma F_x=-T_1cos18^{\circ}+T_2cos35^{\circ}=0$ $\implies T_2=T_1cos18^{\circ}/cos35^{\circ}$.......eq(1) Similarly $F_y=T_1sin18^{\circ}+T_2sin35^{\circ}-mg=0$ $T_1sin18^{\circ}+(T_1\frac{cos18^{\circ}}{cos35^{\circ}})sin35^{\circ}-mg=0$ $\implies T_1(sin18^{\circ}+cos18^{\circ}tan35^{\circ})=mg$ $\implies T_1=\frac{(68)(9.81)}{sin18^{\circ}+cos18^{\circ}tan35^{\circ}}$ $T_1=684N=0.68KN$ From eq(1) $T_2=T_1\frac{cos18^{\circ}}{cos35^{\circ}}$ $T_2=(0.68KN)\frac{cos18^{\circ}}{cos35^{\circ}}$ $T_2=0.79KN$
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