Q33 / 52 · KVPY 2017 (19 Nov SA) · Physics

In an experiment on simple pendulum to determine the acceleration due to gravity, a student measures the elngth of the thread as $632 \mathrm{~cm}$ and diameter of the pendulum bob as $2.256 \mathrm{~cm}$. The student should take the lenght of the pendulum to be

  • A
    $64.328 \mathrm{~cm}$
  • Correct answer
    B
    $64.36 \mathrm{~cm}$
  • C
    $65.456$
  • D
    $65.5 \mathrm{~cm}$

Solution

length should be taken up to com $\begin{array}{l} \ell_{\text {net }}=63.2+\frac{2.256}{2} \\ \Rightarrow 64.328 \end{array}$ by signlicont figures $\ell_{\text {net }} \Rightarrow 64.3 \mathrm{~cm}$

Hence, the correct answer is option: 'B'.