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If M-16 kg, what is the tension in string 2? The angles shown are 30° for string 1 and 60° for string 2.

If M16 Kg What Is The Tension In String 2 The Angles Shown Are 30 For String 1 And 60 For String 2 class=

Sagot :

Since the block is at rest, i.e., equilibrium, the net force on the system must be zero: That means:

[tex]\begin{gathered} F_{1x}=F_{2x} \\ F_1\sin 30^o=F_2\sin 60^o \\ F_1=\frac{F_2\sin 60^o}{\sin 30^o}^{}\rightarrow eq(1) \end{gathered}[/tex]

Also we have:

[tex]\begin{gathered} F_{1y}+F_{2y}=W \\ F_1\cos 30^o+F_2\cos 60^o=mg \\ \frac{F_2\sin60^o}{\sin30^o}\cos 30^o+F_2\cos 60^o=mg \\ F_2\sin 60^o\cot 30^o+F_2\cos 60^o=mg \\ F_2(\sin 60^o\cot 30^o+\cos 60^o)=mg \\ F_2=\frac{mg}{\sin 60^o\cot 30^o+\cos 60^o} \\ \end{gathered}[/tex]

Lets say that g = 9.8 m/s², then if we plug the data we get:

[tex]\begin{gathered} F_2=\frac{16\times9.8}{(0.87)\times(1.73)+(0.50)} \\ \\ F_2=\frac{156.8}{2.01} \\ \\ F_2=78N \end{gathered}[/tex]

Answer: the tension in string 2 is 78 N.

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