1. Determin or false in R³. (a) Two lines parallel to a third line are parallel. (b) Two lines perpendicular to a third line are parallel. (c) Two planes parallel to a third plane are parallel. (d) Two planes perpendicular to a third plane are paralle (e) Two lines parallel to a plane are parallel. (f) Two lines perpendicular to a plane are parallel. (g) Two planes parallel to a line are parallel. (h) Two planes perpendicular to a line are parallel. (i) Two planes either intersect or are parallel. (1) Two lines either intersect or are parallel. (k) A plane and a line either intersect or are parallel.

Solve the Resultant Force at A

5a. If lengths a=1.2m, b=3.7m, c=1.6m, d=4, e=1.4m, and f=4.3m, determine the angle (in degree) between the forces F_A and F_B. Answer must include 1 place after the decimal point. 5b. If lengths a=1.1m, b=4.8m, c=1.1m, d=3.2, e=1.3m, and f=3.2, determine the moment (in N*m) caused by force F_A about axis OD. Answer must include 1 place after the decimal point. Negative sign must be included if the rotational tendenct about the OD axis (from O to D) is clockwise. 5c. Find out all support reaction components at the fixed support O after being given all forces and lengths. ( use the 2nd image  named practice problem 5-2 for this question)