# Homework Help: A position versus time graph involving the unit circle

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1. Dec 4, 2014

### littlejon

1. The problem statement, all variables and given/known data

2. Relevant equations
v(x)t= -wAsin(w+o)

3. The attempt at a solution
-5(10)sin(0)= 0
D
is this the right procedure?

2. Dec 4, 2014

### haruspex

I'm not aware of any such equation. The equation you want is of the form x(t) = .
No.
The first step is to figure out the amplitude. Can you think how to read that off the graph?

3. Dec 4, 2014

### littlejon

amplitude is 5

4. Dec 4, 2014

### haruspex

No. How did you arrive at that? How is the amplitude of an oscillation defined?
Have you found a correct equation?

5. Dec 5, 2014

### littlejon

I just saw the wavelength and assumed it was 5.

6. Dec 5, 2014

### lep11

This equation is wrong.

7. Dec 5, 2014

### haruspex

Amplitude is not wavelength. What do you think is meant by the amplitude of a wave?
You still haven't provided any correct equations related to SHM. Don't you have any notes or textbooks? If not, read it up online.