Stuck — 399 discussions

Hey Im doing FEA and got stuck on question. The diagram go me stuck, because looking through the workbook it says high stresses are in red and low in blue, whereas they included both different kind of stresses on the same diagram and no data. Note: High Compressive strains are noted by blue...

the steel glass is stuck diagonally inside the press cooker, getting it out by brute foce didn't work and neither are we able to rotate it. Washing it with soapy liquid didn't work either. Any ideas on how I can get the glass out?

I'm aware that I can introduce the perimeter p = dy/dx then I can rearrange my equation to make y the subject, then I can show that dp/dx = p/x. However, this only gives me a bunch of quadratic curves for my solution. However given part b I see that two curves are meant to intersect each point...

I know how to construct Sy for spin = 1 case from the raising and lowering operators. I get $$ S_y=\frac{i\hbar}{\sqrt{2}}\begin{pmatrix} 0 & -1 & 0 \\ 1 & 0 & -1 \\ 0 & 1 & 0 \\ \end{pmatrix} $$ From what I have seen, the eigenspinor for $\hbar$ is found by solving $$...

Hi, Unfortunately, I have problems with the task 4 In task 3 I got the following $$ T_f=T_ie^{\Delta S_i - c_i} $$ Then I proceeded as follows $$ \Delta S = \Delta S_1 + \Delta S_1 $$ $$ \Delta S =c_1ln(\frac{T_ie^{\Delta S_i - c_i}}{T_1})+c_2ln(\frac{T_f}{T_2})$$ $$ \Delta S...

I'm stuck to understand 3 laws of Newton. It doesn't make sense to me. 1. Suppose the case when a person stay in a rest vehicle.When we accelerate the car the person still at rest so the person has to move to the tail of the vehicle cause his intertia of staying rest. If we decrese the...

The equality is implied in the move from equation 15.43 line 2 to line 3. I do find Dray's book is admirably clear and absolutely says something I wish to understand, but my 78 year old brain has difficulty. However, in this case I can be precise about where I fail to follow. Oh! I find...

i tried but i wasn't able, maybe i choose the wrong formulas in the wrong time.

Some more details on the system are that L1 is very long (close to 100ft) and L2 is close to 30ft (the vertical pipes). The piping is all schedule 40 1/2" OD. Moment of inertia is roughly 10^-8. Components are about 2kg each. The distance of the pipes horizontally is small (around 2ft). Pressure...

This is where I'm stucked i don't even know if my reasoning is correct.

I tried solving this and realized that I have no idea what r2 is and I can't just insert an equation there

I am very confused on how to go about with this question. The only thing I've tried so far is drawing the fbd of the electron and because of the plates the force applied would cancel which makes it centered between the two plates. As of now that is the only thing I understand, I am not sure how...

[Mentor Note -- Interesting engineering discussion from the Weird News GD thread moved to the General Engineering forum as its own thread] How That Massive Ship Got Stuck in the Suez Canal—and Why Nobody Can Get It Out...

I sent the work divided by two equal to the velocity part of the problem then got stuck.

The equation $$(a-1)x^2-4ax+4a+7=0$$ with a is a whole number has positive roots. If $$x_1>x_2$$ then $$x_2-x_1=...$$ A. –8 B. –5 C. –2 D. 2 E. 8 Since the equation has positive roots then $$x_1>0$$ and $$x_2>0$$ thus $$x_1+x_2>0$$ and $$x_1x_2>0$$ $$x_1+x_2>0$$ $$\frac{-(-4a)}{a-1}>0$$...

Please can anyone help me on how to work this out ?

https://www.cnn.com/2021/01/26/tech/iphone-ipad-ios-14-4-update/index.html Apple warned iphone and ipad users to updddate their systems today. I tried to on my iPad, but it's "stuck" on "Preparing Update." I tried shutting it down after 30-40 minutes (not sure if that messed up anything, as...

Find determinant of following matrix: ## A = \begin{pmatrix} a_{1,1} & a_{1,2} & \cdots & a_{1,n-1} & a_{1,n} \\ a_{2,1} & a_{2,2} & \cdots & a_{2,n-1} & 0 \\ \vdots & \vdots & \ddots & \vdots & \vdots \\ a_{n,1} & 0 & \cdots & 0 & 0 \end{pmatrix} ## Note: I tried to solve this question...

Summary:: x Let ## \{ a_{n} \} ## be a sequence. Prove: If for all ## N \in { \bf{N} } ## there exists ## n> N ## such that ## a_{n} \leq L ## , then there exists a subsequence ## \{ a_{n_{k}} \} ## such that ## a_{n_{k}} \leq L ## My attempt: Suppose that for all ## N \in {\bf{N}} ##...

I don't get why the total mechanical energy is not conserved in this situation. When the length of the spring reaches the maximum, the speed of the block is 0 and we have the following equation: $$E=K+U=1/2mv^2+1/2kA^2,\text{where A is the amplitude} \implies E=1/2kx_{max}^2$$ I can't see why...

Does any researcher/scholar/professor here ever feel stuck with the field they have chosen to pursue? Do you ever feel it's too late to switch or regret not choosing something else while studying?

I know this is the equation I have to use a(x - h) 2 + k, but don't know what points to use and how to covert to vertex form

Please someone help me

Actually, i don't even started the solution because i am confused, i am not sure what the question is asking, i tried to see the solution, but it was using , i don't know what that equation mean. Can you help me? P is like potential electricity, for gravitational force?

My professor does not walk us through the problem. He literally just gave us an equation and that's it. I do not know how to do this problem.

I got stuck when i eliminated the parameter.

I am trying to show that given the following stochastic differential equation: ##\dot{x} = W(x(\tau))+\eta(\tau),## we have ##det|\frac{d\eta(\tau)}{dx(\tau')}| = exp^{\int_{0}^{T}d\tau \,Tr \ln([\frac{d}{d\tau}-W'(x(\tau))]\delta (\tau - \tau'))} = exp^{\frac{1}{2}\int_{0}^{T}d\tau...

Hi, I have been trying to solve question A for a while now but keep getting stuck. Would anyone know what to do after this? My teacher told me that maybe I should try using the elastic limit (in part b) but normally if I had needed it, it would have been in the first part of the question.

How did you find PF?: Google search Hi I am trying to construct a firewood trommel and have been going in circles (no pun intended) in order to calculate the max torque and HP of the electric motor that might be required. Any help would be greatly appreciated. I know the following...

I'm stuck on a few Vector homework problems. I don't quite understand how to write vectors A+B and A-B for questions 1b and 2b. I tried starting with calculating the magnitude for vector A+B on question 1b and then followed by finding theta, but I'm not sure if that's what I'm supposed to do...

Hi, I've been following the derivation of wolfram mathworld for this problem and I'm running into some trouble regarding the summation indices. Currently I am at the step where we have found that (it's pretty much just binomial expansion and taylor series to get to this point) $$ f(x) =...

this is as far as I get:

I encountered this problem is Hopital section...how do I even apply it?

1. ((N ⊃ P) ⊃ (I ⊃ P)) ⊃ ((P ⊃ I) ⊃ P) P 2. (I v X) ≡ (R ⊃ P) P 3. R ⊃ (I ⊃ (N ^ V)) P 4. R A 5. Reiteration of 3 6. I ⊃ (N ^ V) 3,4 ⊃E 7. I A 8. I v X 7, vI 9. Reiteration of 2...

My tray got stuck in the kitchen sink like horizontally. I tried putting hot water on top of it but it is not working. Any possible solution ?

Hello I hope someone can help me, as i am kinda stuck for the moment. As you can see, the assignment states that I need to find the poles from the closed loop transfer function. I plan on doing so, by using block diagram reduction method. This is as fare as I've come, and can't come...

I don’t understand how the second (-2) (in front of the integral sign) gets into the equation. Can you please help me?

Homework Statement You wish to row straight across a 63 meter-wide river. You can row at a steady 1.3 m/s relative to the water and the river flows at 0.57 m/s. In what direction should you head, and how long would it take you to cross the river? Homework EquationsThe Attempt at a Solution...

The problem goes as follows... " One model for the adsorption of gas atoms on a metal surface approximates the surface to be a corregated muffin-tin potential. A gas atom can lower its energy by sitting in one of the potential minima which are the adhesion sites on the surface each with a...

Homework Statement I've tried hours and hours to model this problem but i didn't succeed. Can you help me ? We want to realize n projects in the next T years. For each project, a profitability index pi is known, which expresses the expected final gain (in Euro) and a cost profile ai =...

Homework Statement A flat cushion of mass m is released from rest at the corner of the roof of a building, at height h. A wind blowing along the side of the building exerts a constant horizontal force of magnitude F on the cushion as it drops as shown in the figure below. The air exerts no...

I'm currently in my second year of physics undergrad. My problem right now is that in one course named Mathematical Physics, I keep getting stuck. When I get stuck I re-read the entire chapter several times carefully and try to solve the problems but I'm unable. I resort to looking at the...

If you have fillings (such as from iron dusts or carbon fiber) stuck in your skin? would it eventually join with your blood flow? What is the filter system of the blood where it couldn't accept the smallest particle and how big is the particle? Imagine iron dust filling or 1 carbon fiber...

Imagine an aircraft of which the its wing is connected to its landing gear by means of a hinge (joint), and then the gear suddenly gets stuck midway. If, subsequently, the aircraft makes a turn around its longitudinal axis (see picture), it seems to hold true that then the angle between the...

I got a small bowl stuck in a pressure cooker. can someone help... I have attached a picture idk if its clear or not but anywayhttps://www.physicsforums.com/attachments/229166

Homework Statement Suppose you take a car trip, traveling east along a very long highway, starting at time t 0. Let x t be the number of gallons of gasoline used during the first t hours, and let st be the distance traveled in that time. Because you’re using very cheap gasoline that’s not good...

Homework Statement Homework Equations v = sqrt(F/(m/L)) The Attempt at a Solution Trying to find the length of the spring. But i can find the tension of the wire at all. I'm not sure what i can do with the frequencies? Maybe I'm forgetting a concept cause i thought the equation v^2/F = L...

Hi I wonder if anyone can help. I am not even sure I am on the right forum. I cannot solve this equation for t. It is the final sequence of a number of equations in a book about modelling athletic performance using bioenergetics. I had a high school maths education 40 years ago and I’m stumped...

Homework Statement Use cylindrical coordinates to evaluate triple integral E (sqrt(x^2+y^2)dv where E is the solid that lies within the cylinder x^2+y^2 = 9, above the plane z=0, and below the plane z=5-y Homework EquationsThe Attempt at a Solution So i just need to know how to get the bounds...