## SNIIX18 one year ago What do the length of the cord and gravity determine for a pendulum? A. velocity B. amplitude C. period D. speed

1. theEric

I don't know much about pendulums, but I think you had a few pendulum problems yesterday. Did you see that equation?

2. SNIIX18

owww yahh the one that you and souvik helped me out

3. theEric

Yep! Haha! $T=2\pi \sqrt{\frac{L}{g}}$ That equation is the only reason I can answer this equation. If I understood pendulums, I'd help you out with that. There, mathematically, the PERIOD is a function of the *length of the cord* and gravitational acceleration (which depends on *gravity*).

4. theEric

Haha, deja vu!

5. theEric

Sometimes, if you know nothing else, you can look to the equations. Especially if it's a test and the equations are given somewhere. So learn what the variables mean, and a little bit to understand them :) It'll probably help more than once.

6. theEric

In more than one way, too.

7. SNIIX18

oww okay so in the formula when you have it set up and you do everythin right at the end whatever you get last is the period right or no

8. theEric

Well the $$T$$ is the variable that is the period. In that equation, it is a function of ("dependent on") both the length of the cord, and gravitational acceleration.

9. theEric

So there is no rearranging involved!

10. theEric

For this problem, I mean.

11. SNIIX18

okay thank you i already got the answer from a very smart person @theEric from you lol :)

12. theEric

Haha, thanks! Congrats!

13. theEric

Really, I never told you outright.. Just directed you to the math! And showed you it. You put that together.