Unit Vector Problem

1. Oct 5, 2009

dtrain121

1. The problem statement, all variables and given/known data
Vector A has a magnitude of 9m. find the angles and the vector A

2. Relevant equations
u-hat equals the vector u divided by its length
cos alpha=Ax divided by A
cos Beta=Ay divided by A
cos gamma=Az divided by A

3. The attempt at a solution
i do not know where to begin because 9 is the only number given, help please

2. Oct 5, 2009

kuruman

Hi dtrain121, welcome to PF. Is the magnitude all that is given? No diagram, no components? What angles are you supposed to find?

3. Oct 5, 2009

dtrain121

yes that is all that is given. im stuck, i do not think you can break it into components, the angles in the x, y, and z axes.

4. Oct 5, 2009

kuruman

If you don't have the axes, then you cannot do the problem without more information. A vector has magnitude and direction. If you are just given its magnitude, then you cannot describe its direction.

5. Oct 5, 2009

dtrain121

it is in all three axes

6. Oct 5, 2009

kuruman

I don't understand what you mean. What is in all three axes?

7. Oct 5, 2009

Staff: Mentor

As kuruman says, there is not enough information to solve the problem. Can you scan the original question and post it here as an attachment? There must be a diagram that shows a vector arrow or something.