question_answer

A simple pendulum of length L and mass m of the bob is vibrating with an amplitude \[\text{n}=4\]. Then the maximum tension in the string is                                      

A)  \[\text{n}=1\]

B)  \[2.5\text{ }m/s\]

C)  \[2.07\text{ }m/s\]

D)  \[4.08\text{ }m/s\]

Correct Answer: B

Solution :

                For any general point of deflection Q. We can write \[4A\] T is maximum when 9=0 \[3A\]   \[1A\]                 \[t=0\]  \[v=4000m/s\]                 \[2A\,\,\sin \,4\pi (x-200t)\]     \[2A\,\,\cos \,5\pi (x-400t)\]                 \[A\,\,sin\,5\pi (x-400t)\]