ranyai12
Can someone please help!! (question is attached)



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ranyai12
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oldrin.bataku
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Remember that the magnitude \(\vec{a}\) and dot product \(\vec{a}\cdot\vec{b}\) both operate on *vector(s)* to yield a *scalar*.

ranyai12
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also just to double check, you cant multiply a vector and a scalar together right

ranyai12
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so would first one be valid

ranyai12
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im thinking its valid, valid,invalid, valid

ranyai12
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am i right?

ranyai12
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@oldrin.bataku

oldrin.bataku
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The last is valid? Are you sure? It's a dot product between a scalar and vector.

ranyai12
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oh no yr right its invalid

ranyai12
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thank you!:)