Finding a vector with given properties

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The discussion focuses on finding a vector v with specific properties: a magnitude of 10, an angle of 45° with the positive x-axis, an angle of 75° with the positive y-axis, and a positive k component. The user seeks assistance in determining the vector's components using the scalar product (dot product) formula, \(\vec{A}\cdot\vec{B}=\left|\vec{A}\right|\left|\vec{B}\right|\cos(\theta)\). The emphasis is on ensuring the k component remains positive while satisfying the given angular constraints.

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So I need to find a vector v with these properties
1. magnitude of 10
2. angle of 45° with positive x-axis
3. angle of 75° with positive y-axis
4. positive k component.


I understand basically just that the k component has to be positive.
Any help would be appreciated.
 
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alexf322 said:
So I need to find a vector v with these properties
1. magnitude of 10
2. angle of 45° with positive x-axis
3. angle of 75° with positive y-axis
4. positive k component.

I understand basically just that the k component has to be positive.
Any help would be appreciated.

Use the following scalar products (dot products).

[itex]\vec{v}\cdot \hat{i}[/itex]

[itex]\vec{v}\cdot \hat{j}[/itex]

In general, [itex]\vec{A}\cdot\vec{B}=\left|\vec{A}\right|\left|\vec{B}\right|\cos(\theta)[/itex]
 

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