(i) Find the resultant force acting at point D and write it in Cartesian form. (Note that CD is parallel to the y-axis, the 40N force acts parallel to the z-axis and the 30N force is parallel to the x-axis.)
(ii) Find the magnitude of the projected component of the resultant force acting along the line AD.
Image of problem is attached.
(i) Unsure about calculating resultant force
(ii) Find Unit vector of UAD and find the dot product of UAD and FR from (i)
The Attempt at a Solution
(i) Unsure if resultant force at point D is simply F1= (-30i) and F2= (-40k) so FR= (-30i - 40k) (Magnitude 50N) ?
(ii) UAD = (-0.2/0.245)i + (-0.1/0.245)j + (0.1/0.245)k
Then F.UAD = (Fi)(-0.2/0.245) + (Fj)(-0.1/0.245) + (Fk)(0.1/0.245)
Thanks for your help,