# Homework Help: 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.