6. Find the projection of 4B on CD and the distance between them. 
19 78 
Ans. SABUCD= , SADUVABCD= =: 
V 94 V 485 
7. Find the equation of the line AB. 
x—2 y—3 241 
Anss 4:P:=t4Bs or pes aS (( = ih je 
» ¢ 
8. Find the equation of the plane ABC, 
Ans. SAPVABAC= 2x + 9y — 10z— 41=0O. 
(a) The distance from this plane to (2, 7’, 7) is SAP7UVABAC, or 
(207+ 9y’— 102’— 41) . 
V 185 
9. The vector whose tensor and components are the moments of AB about 
C and about axes through (' parallel to OX, OY, OZ, is VCAAB = [2, 9,— 10]. 
10. The work done by CD in making the displacement AB is SABCD=19. 
Rose Polytechnic Institute, 
Terre Haute, Ind. 
