Question

皮卡丘⭐️

我知道第一步要先Fa cross rpa +Fb cross rpb +Fc cross rpc,但下一步就不知道怎麼做了，列出解題過程就好，謝謝

LUST.
Replace the three forces acting on the plate by a
wrench. Specify the magnitude of the force and couple
moment for the wrench and the point P(x, y) where the
wrench intersects the plate.
X
FB = {-300k} N
B
Fc = {200j} N
5 m
9
FA = {400i} N
Z
C
P
A
Prob. 4-137
3 m