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in Physics by (28.9k points)
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If the length of pendulum is made 9 times and mass of the bob is made 4 times then the value of time period becomes 

A) 3T 

B) 3/2T 

C) 4T 

D) 2T

1 Answer

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Best answer

A) 3T

Explanations:

The periodic-time of a simple pendulum is given by

\(T= 2\pi \sqrt \frac{l}{g} \)

\(T_1 = T,l_1=l,l_1=9l\)

\(\frac{T1}{T2}=\sqrt\frac{l_1}{l_2}=\sqrt\frac{1}{9}=\frac{1}{3}\)

\(T_2=3T_1=3T.\)

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