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Find the magnitude of the vector 3hati-4...

Find the magnitude of the vector `3hati-4hatj+12hatk`.

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`vecA=(3hati-4hatj+12hatk)`
`therefore vecA*vecA=(3hati-4hatj+12hatk)*(3hati-4hatj+12hatk)`
`=3^2+(-4)^2+12^2=169`
Now `vecA*vecA=A^2, therefore A^2=169 `
`therefore A=sqrt(169)=13` units.
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