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Question
If `veca=2hati+hatj+3hatk and vecb=3hati+5hatj-2hatk` ,then find ` |veca xx vecb|`
Solution
Given that `veca=2hati+hatj+3hatk and vecb=3hati+5hatj-2hatk`
we need to find `|veca xx vecb|`
`veca xx vecb=|[i,j,k],[2,1,3],[3,5,-2]|`
`=hati(-2-15)-hatj(-4-9)+hatk(10-3)`
`=-17hati+13hatj+7hatk`
Hence, `|veca xx vecb| =sqrt(17^2+13^3+7^2)`
`=>|veca xx vecb|=sqrt(507)`
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