# Math Help - really hard question:P

1. ## really hard question:P

The period of a pendulum is the time it takes to swing back and forth, returning to its original posistion. The relationship between the period, T(in seconds) and teh length of the pendulum L (in meters) is as follows T^2-4L=0
Correct to the nearest tenth of a second what is the period of the pendulum 3 m long?

2. Originally Posted by mcinnes
The period of a pendulum is the time it takes to swing back and forth, returning to its original posistion. The relationship between the period, T(in seconds) and teh length of the pendulum L (in meters) is as follows T^2-4L=0
Correct to the nearest tenth of a second what is the period of the pendulum 3 m long?
Take the given equation, plug in the given value of L and solve for T:

$T^2-4\cdot 3=0~\implies~T=\sqrt{12}~\approx 3.464\ s$

(Keep in mind that you have to modify this value!)