Vector Projection Question (1 Viewer)

[popjin]

Where am I going wrong here?

Question:
Given vector u = (-4cos30, 4sin30) and vector v = (6cos45, -6sin45) find projuv (projection of v onto u) in exact form

Working:

 

[Eagle Mum]

Are you supposed to be dividing or multiplying by 16(?)

 

[Etho_x]

Are you supposed to be dividing or multiplying by 16(?)

Dividing if |u|^2 is 16

 

[Etho_x]

Where am I going wrong here?

Question:
Given vector u = (-4cos30, 4sin30) and vector v = (6cos45, -6sin45) find projuv (projection of v onto u) in exact form

Working:
View attachment 29788

I see what you’ve done, that 16 caused you a bit of an error. You should be multiplying by 1/16 (remember your fraction laws : 0)

 

[popjin]

Are you supposed to be dividing or multiplying by 16(?)

I see what you’ve done, that 16 caused you a bit of an error. You should be multiplying by 1/16 (remember your fraction laws : 0)

Ah yup, that was it - I should have caught that. Thanks so much for the help!