The resultant of two vectors A and B is R if the direction of B is inverted then the resultant will equal R*3^(1/2) prove that the resultant in the second case is perpendicular to the resultant in the first one

A body is rotating with an angular velocity of 2radians per second about the line joining (1, 2,3) and (2, 3,5) find the velocity of the particle of the body which is momentarily at (3, 5,6)

Show that: vectorPQ+vectorPR+ vectorPS +vectorTP+vectorUP = 4PQVector

Given that A×(B×C) = (A.C)B - ( A.B)C , deduce that (A×B)×C = (A.C)B - (B.C)A

the mean of 30 observations was 17 with sd2. later it was found that two of the observations were incorrect, which were recorded as 19vand 21.find the correct sd if the incorrect values are deleted and correct values 22 and 15 are included

Find the component of 2i +3j +k in the direction of 3i-j