Question

In the figure given below, an ideal pendulum oscillates in vacuum between two extreme position A and B. If it goes from position A to position B and then returns from position B to mean position C in 3 s , then it will complete 3.5 oscillation in
14 s
4 s
1.14 s
2 s

Answer 1

"Total time is taken by a pendulum to move from A to B to C = 3 sec

One oscillation will move as per A to B and then back to A

Hence, the vacuum system will be as per B to C that will be equivalent to C to A

Hence, for the total of .75 oscillation, the time will move up to 3 second

1 oscillation = 4/3 * 3 = 4 sec

3.5 oscillation = 3.5 * 4 = 14 sec

"