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the planes are parallel to the front plane

is that understandable? uploading pics is taking forever right now

I think I know the orientation it's supposed to be, but the bottom picture is difficult to decipher

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you can also try the engineering study group

thx i have, no one's ever there. my ? was posted there first

haha same with my sister. i guess it's the standard course material across universities..

i prefer statics much more but this is summer course so materials are very condensed.

it's ok, thx for looking. particle dynamics sounds nasty 0_o

bending moments were covered in the first chapter

typo, bending/flexural stresses*

o yea, haven't heard of it yet. anyway thx. gonna try again tomorrow.

I got 9.05 kn, see below:
\[\tau = \frac{V}{A}\rightarrow V=\tau A\]
In the case for the bolts:\[V=\frac{P}{4}\]\[A= \pi(0.003m)^2=2.8274(10^{-5})m^2\]\[\tau = 80MPa=80(10^6)Pa\]
The shear force is 1/4 of the load because you must take into consideration both ends of both bolts; just like they take into consideration both sides of both bolts (the four shaded planes). See the attached image, all four shaded areas represent an individual shear.
Plugging everything in and solving for P;
\[P_{bolts}=4(80MPa)(2.8274(10^{-5})m^2)=9.048kN\]
And I got
\[P_{planes}=20kN\]
So the answer is the smaller one: 9.048kN

thx so much and thx for the references!

No problem, feel free to ask me any mme questions in the future, I loved this class!