A) 100 N
B) 80 N
C) 60 N
D) 50 N
Correct Answer: B
Solution :
According Lamis theorem \[\frac{{{T}_{1}}}{\sin 180{}^\circ -\theta }=\frac{{{T}_{2}}}{\sin \,(90{}^\circ +\theta )}=\frac{W}{\sin 90{}^\circ }\] \[\sin \theta =\frac{4}{5},\] \[\cos \theta =\frac{3}{5}\] So, \[{{T}_{1}}=W\sin \theta =100\times 4\text{/}5=80N\]You need to login to perform this action.
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