# Simple Pendulum Question

1. Feb 14, 2005

### Nima

Simple pendulum has T = 2pi rt (l/g) when oscillating at a natural frequency of vibration. (Small angles of course)

Calc. new T of pendulum when oscillating in a car with acceleration a.

Any tips? Thanks. :)

2. Feb 14, 2005

### Nima

Can anyone do this question? Cheers.

3. Feb 14, 2005

### clive

$$T=2\pi \sqrt{\frac{l}{\sqrt(a^2+g^2)}}$$

4. Feb 14, 2005

### Nima

Cheers Clive - Would you mind explaining (or any1 else) how you arrived at that answer? thanks.

5. Feb 14, 2005

### Staff: Mentor

6. Feb 14, 2005

### Nima

Thanks very much, it certainly was! I understand that totally! You found the effective g acting on the pendulum by summing the individual accelerations acting on the pendulum, using vectors. Great. :)