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4.1 , newtons laws of motion — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics4.1 , newtons laws of motion1 Mark
MCQ
An uniform thick string of length $8\, m$ is resting on a horizontal frictionless surface. It is pulled by a horizontal force of $8\, N$ from one end. The tension in the string at $3\, m$ from the force applied is ........ $N$
  • A
    $0$
  • ✓
    $5$
  • C
    $4$
  • D
    $1$
✓

Answer

Correct option: B.
$5$
b
Let the mass of the string is $M$

acceleration of the string $=\frac{8}{\mathrm{M}}$

$8-\mathrm{T}=\left(\frac{3 \mathrm{M}}{8}\right) \times \frac{8}{\mathrm{M}} \Rightarrow \mathrm{T}=5 \mathrm{N}$

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