Question

Considering two vectors,`F = (4hati - 10hatj)` netwon and `vecr = (-5hati - 3hatj)` m compute `(vecrr xx vecF)` and states what physical quaninty it respresents ?

Answer 1

As ` vecF = (4hati - 10hatj + 0hatk) and vecr= (-5hati- 3hatj + 0hatk)`
`" "vecr xx vecF =|{:(hati,hatj,hatk),(x,y,z),(F_(x),F_(y),F_(z)):}|=|{:(hati,hatj,hatk),(-5,-3,0),(4,-10,0):}|`
`i.e., " "vecr xx vecF = hatk ( 50+12) `
`" "= 62 hatk N-m`