202 



6. Find the projection of ^47? on CD and the distance between them. 



19 78 



Ans. SA B UCD = , SAB UVABCB = — — . 



V 94 i/48o 



7. Find the equation of the line J />. 



x — 2 v — 3 z + 1 



Ans. ^4P= Ui>\ or = : = ■ ( — t ). 



1 2 2 



8. Find the equation of the plane ABC. 



Ans. SA P VA BA C = 2x + 9y — 1 Oz — 41 = O. 

 (a) The distance from this plane to (x', if, z") is SAP'UVABAC, or 

 ( 2.r / + 9,y / — IQz'— 41) , 

 l/l85 



9. The vector whose tensor and components are the moments of AB about 

 Cand about axes through C parallel to OX, OY, OZ, is VCAAB = [2, 9,-10]. 



10. The work done by CD in making the displacement AB is SABCB = 19. 



Rose Polytechnic Institute, 

 Terre Haute, hid. 



