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  4. An object of mass 10 kg is connected to the lower end of a massless string of length 4 m hanging from the ceiling. If a force F is applied horizontally at the mid-point of the string, the top half of the string makes an angle of 45° with the vertical, then the magnitude of F is

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Q. An object of mass $10 \, kg$ is connected to the lower end of a massless string of length $4 \, m$ hanging from the ceiling. If a force $F$ is applied horizontally at the mid-point of the string, the top half of the string makes an angle of $45^\circ $ with the vertical, then the magnitude of $F$ is

NTA AbhyasNTA Abhyas 2020Laws of Motion

Solution:

Solution
$\frac{T}{\sqrt{2}}=100$
$\frac{T}{\sqrt{2}}=F$
$F=100 \, N$