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At the end of lecture 19, Professor Aroux remarks that since F and T are parallel vectors, the dot product is just the length of F. Why is that true?
 one year ago
 one year ago
At the end of lecture 19, Professor Aroux remarks that since F and T are parallel vectors, the dot product is just the length of F. Why is that true?
 one year ago
 one year ago

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adgaBest ResponseYou've already chosen the best response.0
I, believe he said that it is the length of F.
 one year ago

sunsunsun1225Best ResponseYou've already chosen the best response.1
I know now. That is because T is a unit vector. Recall the equation \[dr/dt=T(ds/dt)\] the left side is velocity, ds/dt is speed or magnitude, and T is unit vector that specifies direction. Since F and T are parallel and T is unit vector (all entries equal to 1), the dot product is F itself. Hope that helps
 one year ago
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