Homework Definition and 998 Threads

Hello, I have posted a homework help request and subsequently documented my attempts to solve it, in two further replies to it. I have replied to my original request because after some time the original post was no longer editable. But now it appears that my help request has already two replies...

TL;DR Summary: about the Special Relativity Can a rest frame be chosen for the center of momentum for a system of two photos?

Was looking for some help on my differential equations homework and found the exact problem which really helped, but the answers stopped halfway through, and I can't figure out how to solve the second half lol

A problem about hitting a mass up into the air has disappeared from the intro physics homework. It was a bit of a train wreck, but the OP was replying and perhaps was willing to work on it. Happy New Year.

Please select up to 3 members who had the most positive impact in the homework help forums in 2024. This is a popular vote. Polls were created by weighing activity and measure of helpfulness. Everyone nominated should feel honored! Many more could be added to this poll, we can never...

Hi I need all the bonding frequencies for all the elements in the human body, IE: carbon-carbon single bond frequency of 1300 cm - 1. It is very important to have the single, double and triple bonds because I am doing something that will require them all. It would also be helpful if someone...

I need to calculate the internal forces M3, V3, and N3 for a specific section of a structural system. The known reaction forces are: R_AH = -5.7 kN R_AV = 0.7425 kN R_CV = 5.02 kN Two different sections have been analyzed: one on the left side of the cut (my choice) and one on the right side...

Please help me with this homework! I haven't had any solutions since it is all unclear.

I was looking for videos, or post on how to do a physics home work problem. Ended up finding a similar post on this website. It didn't quite answer my question, but I thought I could post here to figure it out.

Hi everyone! I stumbled across this forum looking for help on my first year physics homework about ~5 months ago and have been lurking ever since. I really appreciate the nature of these forums in that the answer to a problem is rarely (if ever) explicitly given, but instead people try to poke...

I know this wavefunction should behave as a symmetric cosine function (possibly as Cos( (k∗x)/(hbar) ?). I also know for a bound state, the wavefunction must decay exponentially outside the well. Additionally, r = (-β+ik)/(β−ik) . However, aside from that, I do not know how to get this question...

i dont know how

Unless i am missing something; there is an error with the textbook It ought to be , ## t= \sqrt {\dfrac{1}{0.04}}= \sqrt 25 = 5## seconds.

The question What I did The answer

For the first part of the problem, I managed to form this matrix; <1|O|1> <1|O|2> <2|O|1> <2|O|2> = 1 0 0 0 However, that was because I was following this image; I'm not entirely sure how this was obtained, and I'm not really sure what to do to continue forward with part e. I...

My question; Which branch of maths is this? Also, can you give me a clue as to where to start regards solving this. Just a hint please, not a full explanation. I'm struggling to even guess at this one. I did think, '60 ponies, 5 of which are tagged, so, 5/60 tagged, which is 1/12 1/12 of the 60...

Hi! My attempt at this solution was: ∫dF = k*q*Q / 2L ∫ (1/r^2) dy and we know that r^2 = D^2 + y^2 based on the diagram. Here is where I start getting confused. I looked at a different physics forum post and the mentor gave this equation: I am mainly confused with the math. How did he end...

I need to find the transit time of the train, from what I see online it should be independent of points A and B and should be roughly 42 minutes. I started by looking at the energies and derived an ODE for the speed of the train to find the transit time but it seems to be wrong. Also, I might...

If wave functions are individually normalized does it mean that they are also normalized if phi 1 and phi 2 are integrated over infinity?

I have this 1D LHO problem. https://gyazo.com/4cd913d9da3a743443ef7dc2d1c2ab1e For ##\psi_n (x)## I get $$\left( \frac{\alpha}{\sqrt{\pi} 2^n n!} \right) ^{\frac{1}{2}} e^{\frac{- \alpha^2 x^2}{2}} H_n(x)$$ with ##E_n = (n+ \frac{1}{2}) \hat{h} \omega##. where ##\hat{h}## is hbar. For...

This is the exercise: [FONT=georgia]Please help me ( question 4 and 5). Here is my effort: First, I represented the forces on both objects. Then, i found F⁰ = 5N (question 1) After that, (question 2) + (question 3) I hope it's even correct.

Hi, unfortunately, I am not getting anywhere with the following task and I try solve it

Which of the following are true for sinusoidal radiation? 1) The electric field and the magnetic field have the same magnitude at the same point in space. 2) The electric field is perpendicular to the magnetic field. 3) The source of the radiation is oscillating charges. 4) The radiation pattern...

Here's the answer: Could you explain the highlighted part for me? Thank you very much!

Could you check if my answer is correct? Thank you very much! Is therea simpler way to solve the math?

Can't attempt to solve the task. I'd appreciate it a lot if you could help!

(1672 MeV/c^2) * c^2 = 1.505 * 10^20 MeV = 1.505 * 10^26 eV = 2.41 * 10^7 J Since E = mc^2, m = E/c^2 Therefore, m = 2.41 * 10^7 / (3 * 10^8)^2 = 2.68 * 10^-10 kg But the answer is 2.97 * 10^-27 kg Help! What is wrong with my logic?

Please can anyone help me with problem? I don't know if the work is 0 J

^^

$$ f=\frac{cs}{2\pi}\cdot\sqrt{\frac{A}{VL}} $$

For number 6 I answer (a) and for number 7 I answer (d) but I can say I just take a guess. In question 6, I tried to think about Newton 3rd law. The force exerted by each arm on the other is equal so assuming the distance from the point where the force acts to the pivot is also the same, the...

+1.56 - 43i1 - 75i2 = 0 +1.6 - 100i3 - 75i2 = 0 +i1 - i2 + i3 = 0——-> i1 + i3 = i2

Hi Everyone, newbie to your great forum. Trying to dust off my old school books to help my growing kids with their homework.....happy to met you all!

I do not know how to do that.

Hi, so my objective is to find Io, and I've attached a picture of my work. Here is my question: At the point Vo1, if I use the equation for finding the output voltage for a non-inverting op amp I end up getting this: $$V_{0{1}}=\left( 1+\frac {r_{f}} {r_{1}} \right)V_{s1} = \left( 1+\frac...

TL;DR Summary: Why the topic give the condition "limρr^5/2=0“？What is the usefulness of this condition？ Thanks!

Context: I must develop a vector that models the path of a tennis ball using vectors without physics formulas I have developed a function that represents the perfect shot in tennis in terms of x & y where x is the court's length and y is the height. And then x & z where x is the court's length...

Hi, good evening/morning/night! I have a problem with this 2 homework problems about curved beams. In both I must calculate the stress at points A and B. My procedure is correct, but for some reason in: First problem - the effort in A is very close to that of the teacher, but the effort in B...

Diagram of the problem below. I have 45 minutes to finish all parts of this question without reference material. The Mechanics of Materials section of these tests are largely Structural Analysis, which I was not taught to this level in my undergrad degree so I am teaching myself via Youtube...

Summary: Definition: If M is a set and p is a point, then p is a limit point of M if every open interval containing p contains a point of M different from p. Prove: that if H and K are sets and p is a limit point of H ∪ K,then p is a limit point of H or p is a limit point of K In this proof I...

Summary: Hi, I'm trying to solve this problem, if it's not right then please help me with a hint without solving it. This formula is just an approximation for small values of theta, but if Vo was greater than the denominator this will lead to large values of theta and then this solution is not...

I have found an answer to all of them (a-e) but I don’t know how to plot the function. Thanks!

The Korean textbook standard defines the convexity of the function as an open section. Many textbooks and university calculus textbooks define the convexity of the curve as an open section. However, some textbooks define convexity as closed sections. Do you think it is right to define the...

Parallel: M1V1+M2v2=M1V1’+M2V2’ (0.5)(3)+0=(0.5)(cos60)(3)+V2’Cos(x)(0.5) V2’cos(x)= Perpendicular: M1V1+M2v2=M1V1’+M2V2’ 0=(0.5)(0.3)(sin60)+V2’sin(x)(0.5) V2’sin(x)= And the divide 2 by 1 Which is tan(x)=2/1 And then plug then back into solve, but I don’t think we do it like this because...

Hello. Can someone give m e pointers on how to find the value of vx given that it is inside a supernode(will it be the valueof the voltage inside or the difference of potential between the two nodes?): here's the exercise and what I've done so far attached. Your time and attention are deeply...

When mass M is at the position shown, it is sliding down the inclined part of a slide at a speed of 2.19 m/s. The mass stops a distance S2 = 2.1 m along the level part of the slide. The distance S1 = 1.18 m and the angle θ = 28.10°. Calculate the coefficient of kinetic friction for the mass on...