Question

please slove it today my exam of aakash anth

Answer 1

Hi friend!

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Since the pendulum takes 3s time for ¾ oscillation (look carefully, it doesn't make a full oscillation in 3s), the time period of the pendulum is 4s. We get this value by doing the following calculation:

$Here, \\ n = No. \: of \: oscillations \\ t = Time \: taken \: for \: completing \: 'n' \: oscillations \\ \\ r = No. \: of \: oscillations \: needed \\ p = Time \: Period$


$n = \frac{3}{4} \\ t = 3s \\ p = t \div n \\ = 3 \div \frac{3}{4} \\ = 3 \times \frac{4}{3} \\ = 4sec$

$3.5 \: rounds \: of \: oscillation = p \times r \\ = 4 \times 3.5 \\ = 14sec$

Therefore, the answer is:-
(a) 14 sec

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