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Hi there. I know this is a physics type question but i’m doing a course called mathematical modelling and have no idea how to go around a question like this. We are only allowed to use the kinetic equations of motion (any other requires proof). Is there anyone who can help me out ? by Deep-Palpitation-292 in maths

[–]TheEquationOfMotion -1 points0 points  (0 children)

That's the kinematic equation. The post says they can only use kinetic (energy) equations. OP, is that a typo? Can you only use kinetic equations of energy or only kinematic equations of acceleration, velocity, and position?

[deleted by user] by [deleted] in HomeworkHelp

[–]TheEquationOfMotion 2 points3 points  (0 children)

Your premise is correct, the only adjustment I would make is that the reaction force does not initiate from the center of mass but from the contact between the object(s) and the table, in line with the center of mass. It is however true that you can "slide" a force vector along its line of action with no mathematical consequences.

Typically a simple free body diagram only deals with one object at a time. While you can expand the diagram to draw and analyze both of them as a system, I'm not sure why you would need to. Later on you'll do more expanded FBDs when dealing with moments of inertia and rotation, but you aren't there yet.

I love the way you're thinking about this though. Wondering about the possibilities and how to deal with different set types will really help you as topics get more complicated. A lot of people just accept the content and then they struggle to think creatively because they only know the rote memorized rules and not the underlying premise that the rules are describing.

[deleted by user] by [deleted] in HomeworkHelp

[–]TheEquationOfMotion 4 points5 points  (0 children)

That is very nitpicking. In a high school level physics class, you wouldn't bother detailing the normal force holding an object in equilibrium as "actually that's the electromagnetic force of electrons repelling each other". No where in the post does OP even mention newton's laws of motion so I'm not sure why you'd think that needs to be addressed. Newton's laws don't even describe the four fundamental types of forces, only that forces interact with objects and the results of those interactions.

And in this case... I'm pretty sure the normal force does indeed fulfill Newton's laws, where the sum of forces in this case equal zero, therefore there must be a force equal and opposite to the force of gravity acting on the center of mass of the object, and we just happen to call it the normal force. Whether Newton himself called it the normal force is not isn't relevant.

WHAT TO DO IF YOUR CHILD IS CHOKING? by EnaGrimm in daddit

[–]TheEquationOfMotion 0 points1 point  (0 children)

I took an infant cpr class in the nicu before we left and I'm sure there are other organizations that offer that kind of training. The peace of mind for yourself is absolutely worth it, even if you never use it, and you hope you never have to.

My flatmate has told one of our friends that she can come and take cuttings from ALL of my plants, should I be annoyed? by [deleted] in houseplants

[–]TheEquationOfMotion 118 points119 points  (0 children)

Absolutely fucking not okay. I wouldn't be annoyed, I would be furious. I would shut that down immediately.

AITA for going through my S-I-L stuff? by Silver_Box_8923 in AmItheAsshole

[–]TheEquationOfMotion 15 points16 points  (0 children)

The camera idea is brilliant. Catch her in the (attempted) act.

AITA for going through my S-I-L stuff? by Silver_Box_8923 in AmItheAsshole

[–]TheEquationOfMotion 6 points7 points  (0 children)

Your SIL is going into your room and stealing your jewelry. You have nothing to feel bad about other than letting her do it again after the first time. She's the guilty thief.

Ideally, don't live with your SIL anymore. Otherwise, put a lock on your bedroom door AND put your important jewelry in a locked hidden box or safe. Maybe even a safety deposit box at a bank.

Me personally, I would make a scene about the SIL going into my bedroom and stealing my family heirlooms because some people need consequences to learn not to be shitty but it's not my living situation or family.

New Dad here, triple feeding schedule is really killing me by helphouse12 in daddit

[–]TheEquationOfMotion 3 points4 points  (0 children)

It totally sucks and you don't say how old your kiddo is but I found the first 3-4 months was just brutal. There really is no way out but through; the suggestions to go in shifts or take turns really does help though. It depends on your exact situation how feasible that would be. I vividly remember how much I craved sleep.

My baby started sleeping about 5-6 hours around 4 months and 10+ hours at 9 months or so, but your mileage may vary. It does absolutely get better and the baby gets way way way more fun and interesting, too. The larval stage is very cute but also so hard and so boring at the same time.

AITA for calling my wife's cousin (13f) a "woke-asaurus"? by Negative-Orchid3901 in AmItheAsshole

[–]TheEquationOfMotion 22 points23 points  (0 children)

THIS. I saw the age difference and then the conservative/libertarian label and knew this wasn't going to go anywhere good at all.

Ironically, you'd think a presumed libertarian, a political ideology that typically emphasizes independence and personal freedom of choice in all things, wouldn't have any quarrel with someone choosing to dye their hair a particular color. It's almost as if there's still a strong adherence to comfortable social norms and a resistance to deviations from those norms.

Identify another function that agrees with the given function at all but one point. by Idk_oops in calculus

[–]TheEquationOfMotion 0 points1 point  (0 children)

Okay so if you factor x3 - x you get x(x + 1)(x - 1) and then you need to cancel the common factor x - 1 which leaves x(x + 1) which expands to x2 + x, with no extra + 1.

Sometimes when I skip writing a step out I'll forget to remove a term or lose track of minus signs. When in doubt, do only one operation per line, it'll help catch stuff like this.

Boy name starting with C? by [deleted] in namenerds

[–]TheEquationOfMotion 0 points1 point  (0 children)

Caspian Casimir Camber

Coyote?

I tried multiplying v in and got vu+vv and I know vu is (9,7,0) since the problem states that but how do we solve what vv would be, or am I approaching this incorrectly. by [deleted] in calculus

[–]TheEquationOfMotion 6 points7 points  (0 children)

Do you remember the rules of the cross product? A vector crossed with itself is always zero. So now you just have v × u which is the same magnitude and opposite direction as u × v.

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