Centroids

Question

Centroids

babynini · Answer

attachment

babynini · Answer

@rvc @satellite73 if either of you are free :>

anonymous · Answer

i am free, but i have no idea 
how do you find a centroid?  i guess we can look it up

anonymous · Answer

maybe they just want you to get rid of that silly compound fraction for the x coordinate

anonymous · Answer

anonymous · Answer

and the area is $4\sqrt2-4$

anonymous · Answer

you got that part i guess

anonymous · Answer

is $$M_y=8\int_0^{\frac{\pi}{8}}x\cos(2x)-x\sin(2x)dx$$?

babynini · Answer

yeah..hm

babynini · Answer

for xbar I got
$$\frac{ \pi/\sqrt{2} -2}{ 4\sqrt2-4 }$$

anonymous · Answer

ok i didn't get there yet, let me wolfram a sec

anonymous · Answer

yeah got that

anonymous · Answer

maybe clean it up by multiplying top and bottom by $\sqrt2$

anonymous · Answer

get $$\frac{\pi-2\sqrt2}{8-4\sqrt2}$$

anonymous · Answer

shall we try for $\overline{x}$?

babynini · Answer

ok! I need to clean up y because I have to enter them together xD

babynini · Answer

so ybar
(pi-2)/(sqrt2 -1)

anonymous · Answer

i would leave it like that 
for $\overline{x}$ i get 8 for the numerator

anonymous · Answer

oh also i think you have them backwards

babynini · Answer

x goes first no?

astrophysics · Answer

|dw:1457231257855:dw| is this your y bar