A book is resting on a shelf that is undergoing vertical simple h… - Vidyadip

MCQ

A book is resting on a shelf that is undergoing vertical simple harmonic oscillations with an amplitude of $2.5 \,cm$. What is the minimum frequency of oscillation of the shelf for .......... $Hz$ the book will lose contact with the shelf? (Assume that, $g=10 \,ms ^{-2}$ )

A
$20$
✓
$3.18$
C
$125.6$
D
$10$

✓

Answer

Correct option: B.

$3.18$

b
(b)

Book started to loose contact with shelf when maximum acceleration $a$ of shelf is such that,

$a_{\max } \geq g$

$\Rightarrow \quad \omega^2 A \geq g$

$\Rightarrow \quad \omega^2=\frac{g}{A}$.

So, frequency of oscillations is

$f=\frac{\omega}{2 \pi}=\frac{1}{2 \pi} \sqrt{\frac{g}{A}}$

$\Rightarrow \quad f=\frac{1}{2 \pi} \cdot \sqrt{2.5 \times 10^{-2}}=\frac{2 \times 10}{2 \pi}$

$\Rightarrow \quad f \approx 3.18 \,Hz$

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