Engineering Statics

B-7


  Given the vectors P = -2i + 3j + 4k and S = i + 3j + 5k, compute the vector product for P and S.

To obtain the vector or cross product, set up a determinant where 
the first row are the unit vectors i, j and k, the second row, the 
components of P in the x, y and z order and the third row the x, y 
dand z components of S.
To solve the determinant it is expanded by minors, hence i times 
3(5)-4(3) -j times (-2)(5)-4(1) + k times (-2)(3)-(3)(1).  Note 
that it is +i, -j and +k.