Posted by **Anonymous** on Tuesday, February 19, 2008 at 11:04am.

A simple pendulum is made from a 0.65m long string and a small ball attached to its free end. The ball is pulled to one side through a small angle and then released from rest. After the ball is released, how much time elapses before it attains its greatest speed?

I am not sure how to solve this problem. I do have the formula, but it doesn't help: 2pi(f)= sqrt(g/L)

Thanks for your help!

- Physics -
**drwls**, Tuesday, February 19, 2008 at 11:28am
An oscillating pendulum, or anything else in nature that involves "simple harmonic" (sinusoidal) motion, spends 1/4 of its period going from zero speed to maximum speed, and another 1/4 going from maximum speed to zero speed again, etc. After four quarter-periods it is back where it started. In your case the period is 1/f = 2 pi sqrt (L/g) = 1.62 s

One-quarter of that is 0.405 s

That is the answer.

- Physics -
**Anonymous**, Tuesday, February 19, 2008 at 12:20pm
How did you get 1.62 s?

- Physics -
**Anonymous**, Tuesday, February 19, 2008 at 12:31pm
Nevermind, I got it. Thank you!

## Answer This Question

## Related Questions

- phyics - A simple pendulum is made from a 0.781-m-long string and a small ball ...
- Physics - A small lead ball of mass 2kg is suspended at the end of a light ...
- Physics - A small metal ball with a mass of m = 78.9 g is attached to a string ...
- Physics Please Help! - A small metal ball with a mass of m = 78.9 g is attached ...
- Physics. LAST PROBLEM!! - A small metal ball with a mass of m = 82.5 g is ...
- momentun - A small steel ball B is at rest on the edge of a table of height h=1m...
- Physics for engineers - A bowling ball weighing 71.3 is attached to the ceiling ...
- physics - A bowling ball weighing 71.2 is attached to the ceiling by a 3.90 rope...
- Physics - A ball on the end of a string is moving in circular motion as a ...
- physics - A bowling ball weighing 71.8 N is attached to the ceiling by a rope of...

More Related Questions