Finding the position on a circle.

[astrololo]

Homework Statement

Someone runs on a circle in the direction of a clock. He goes at constant speed. The circle is put in a xy plane that is centered at the origin. The radius is 10 m. At a certain moment he has a speed of (3i + 3j) m/s. Determine the position at this moment. (in vectorial notation)

Homework Equations

a^2+b^2=c^2

The Attempt at a Solution

3^2 + 3^2 = 18
4.24
Square root ( 18) = 4.24 m/sLast question for tonight, I promise.[/B]

 

[phinds]

The question asks for a position and you have specified a speed as your answer.

 

[astrololo]

The question asks for a position and you have specified a speed as your answer.

Yeah, but we need to find the length of the vector of the speed to be able to find the position, no ?

 

[phinds]

What do i and j represent?

 

[astrololo]

What do i and j represent?

Oh, IM really sorry. i and j are vectorial units.

 

[phinds]

Oh, IM really sorry. i and j are vectorial units.

units of what? What I'm trying to get here is for you to specify more clearly just what it is that you know. You really should draw a picture.

 

[astrololo]

It's m/s

 

[phinds]

It's m/s

We're really getting nowwhere here. Draw a picture showing what you know and what you are tying to find out.