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class Thread extends Board {

public void Kinematics problem help(OP Anonymous) {

String fullTitle = 'Kinematics problem help';
int postNumber = 1458202;
String image = '1714060733912495.png';
String date = '04/25/24(Thu)11:58:53';
String comment = 'You don't have to solve it completely but give me some hints. Keep in mind I have almost no knowledge of physics at all, and please don't be surprised if the problem looks too simple to you. I have required level of math however.

>φ = 45°, ∠BAO = 90°, vA (velocity A) = 14m/s, AB = 70 cm. Find vB.

I don't really understand what vB is let alone how to find it. It means "velocity B" in some sense but I'm not sure which.';

}

public void comments() {

if(Anonymous && title=='undefined' && postNumber==1458237 && dateTime=='04/25/24(Thu)14:37:35') {

'>>1458202
Not a physician mathematicist but to me it seems the solution will depend on knowing the size OB which doesn't seem defined by how you worded the problem. Are you sure phi is the pictured angle and not the angle AOB for example?
Anyway, A and B are connected so they rotate together. A moves on a circle of radius OA, B - on a circle of radius OB. By being connected they have same angular velocity. Angular velocity is vA/OA and also vB/OB. So vB = vA*OB/OA = 14*OB/70.';

}

if(Anonymous && title=='undefined' && postNumber==1458715 && dateTime=='04/27/24(Sat)11:24:09') {

'>>1458202
Engineer here. I second this >>1458237 analysis, though I think there's some mistake in the end. The angle phi is redundant, and the length OA is absent. With OA you can calculate OB (Pythagoras), and then use the angular-to-linear velocity conversion as provided by the other anon.';

}

if(Anonymous && title=='undefined' && postNumber==1458964 && dateTime=='04/28/24(Sun)14:34:09') {

'>>1458237
>>1458715
Thanks for the responses. What is the triangle with circle on top symbol (near O)? What does it represent? I also saw the same symbol but without the circle (so just a regular triangle), and what does it represent too?';

}

if(Anonymous && title=='undefined' && postNumber==1458967 && dateTime=='04/28/24(Sun)14:45:04') {

'>>1458237
>>1458715
Also, I'm 100% sure I've presented the problem as it was presented to me.';

}

if(Anonymous && title=='undefined' && postNumber==1458982 && dateTime=='04/28/24(Sun)15:47:38' && image=='Screenshot from 2024-04-28 21-43-47.png') {

'Now please help me with this similar one.
>Determine the position of the instantaneous velocity pole for rod AB.
>Plot the direction of the angular velocity of rod AB.
>Determine the angular velocity of rod AB if vA = 20m/s, APv = 2m are known
>Determine the speed of point B if BPv = 1.2m.';

}

if(Anonymous && title=='undefined' && postNumber==1459082 && dateTime=='04/29/24(Mon)01:36:07') {

'>>1458967
Then what are we doing, "100 physics problems for assholes, by assholes"? If you are trying to learn stuff it's better start with solvable problems that are clearly worded.
>>1458964
A circle is a nondescript rotation point, a triangle is a nondescript riser.
>>1458982
B only moves up and down linearly, A rotates on a circle, they are connected. The problem talks about https://en.wikipedia.org/wiki/Instant_centre_of_rotation , I think.';

}

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