Ryabushko A.P. IDZ 2.2 option 8

DHS - 2.2
№1.8.Dany vector. It is necessary to: a) calculate the mixed product of three vectors; b) Find the unit vector product; c) to calculate the inner product of two vectors; g) check whether collinear or orthogonal two vectors; d)
check whether the three vectors are coplanar. a (4; 2; 3); b (2, 0, 1); c (-12; -6; 9)
№2.8. The tops of the pyramids are at points A (7, 5, 8); B (-4; -5; 3); C (2; -3; 5); D (5; 1; 4). ...........
№3.8. The strength of F (-9; 5; 7) is applied to the point A (1, 6, 3). Calculate a) the work force in the case; when its point of application; moving in a straight line moves to point B (4, -3, 5); b) module force moment about the point B.