Urgent Definition and 393 Threads

Hello all I recently bought a cabbing grinder machine from India and now recognize that the motor(1/2hp 230v~) doesn't have any safety label or certificate whatsoever. I know close to nothing about motors or electricity and ask myself if it is safe to use the machine. To be honest I don't even...

Please also solve this : Let f(x), g(x) and h(x) be the functions from Problem A.1. Find the derivative λ0(x) of the following function with respect to x: λ(x) = f(x) · g(x) + f(x) · h(x) − g(x) · h(x)Note: here problem A.1 is the upper problem.Please solve both the problem.

Hello, any answers appreciated: 'Two spheres are 5 m apart. Sphere 1 has a charge of -20 mC and sphere two has a charge of -50 mC. (a) Find the strength of the electric field at the sphere's halfway point. (b) Find the electric potential at the halfway point

For a) I did Eg = Ee + Eg and tried to solve for x. I got 5.4 m but I think this is wrong. I have no idea how to do the rest, please help :')

[Moderator: repeated text removed.]

Homework Statement This is the question Structure opposite comprises 5 ions each of which has lost one electron. The sides of the square formed by the 4 outer ions are of length 0.2nm Ion E is at the midpoint 1.What is the force on A due to ion A?Homework Equations I'd imagine: F= kq / r^2...

Homework Statement The photon is normally assumed to have zero rest mass. If the photon did have a tiny mass, this would alter the potential energy the electron feels in the hydrogen atom (due to the Coulomb interaction with the proton). The potential then becomes yukawa potential...

Hello, Sorry, I'm sure this question has been asked many a time, however I could not find anything satisfying my needs. Basically, I need a research task soon, and I really don't know anywhere else to ask for advice. I have thought about this for a couple hours and researched however I could...

Hello Forumers, Its been very long time since I haven't not been on PF. Today that streak ends! I want ideas for my physics school project. please give me some great ideas & where to find it! please keep the following in mind while giving ideas:- 1. I am 12th Grade student 2. I want a...

Homework Statement Homework EquationsThe Attempt at a Solution [/B] As this is an indeterminate structure with degree of redundancy 2, I have released support B & C. I then draw the BMD M0 of the Primary structure as well as BMD m1 and m2 of unit load system acting on B & C as follow: I...

Homework Statement The combustion of 0.1577 g benzoic acid increases the temperature of a bomb calorimeter by 2.51°C. a) Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.) A 0.2123-g sample of vanillin is then burned in the same...

Homework Statement An example in my problem set (homework help) An oak rod is hung from a rigid support. The rod has a diameter = 12 mm, length = 9 m, and a catch plate at its base. a) The maximum mass of a weight that each rod can support. b) The minimum mass of a weight that will break the...

What would be interesting equations to work with, using Big O? I'm searching for something that may look simple at first, but can evolve into something more complex!

Homework Statement How to prove the correlation between launch angle (<45°) and horizontal displacement. Independent Variable: Horizontal distance Dependent Variable: Launch Angle (Important) Controlled Variable: Firing velocity [90 m/s] Another problem is, with the data that I have...

Homework Statement July 22,2017. Homework Statement Television and radio waves can reflect from nearby mountains or from airplanes. Such relfections can interfere with the direct signal from the station. a. Determine what kind of interference will occur when 75-MHz television signals arrive at...

<Mentor's note: moved from a general forum and therefore no template> This is the equation of potential energy in rubber bands, however, I don't know how to calculate the inertia of the arm of catapults or get the k constant. And what does n mean? Basically, i don't understand the whole...

Homework Statement For school, we have to build a mousetrap car, and get it to go 3m. Our car doesn't roll very well, and we aren't quite sure of the problem. We have an axle that is 5mm wide, and the thing that holds it to the chassis is made of cardboard. Also, the mousetrap is pretty far...

Hello, so for school I'm building a mousetrap with my group for a project, but our car isn't moving. We filmed it snapping, and it doesn't seem like it is because of friction, since the axle spins pretty well. We thought that it was because the thing that holds the axle bends, but after fixing...

One of classes needs me to interview an engineer with a degree of my same major (mechanical engr), preferably with 7+ years of experience in the field (we can lie about that, but deadlines are approaching and I've struck out everywhere), AND A BUSINESS CARD (used as proof to my professor that...

Homework Statement A parallel-plate capacitor is connected to a 100 V battery until it is fully charged. The distance between the plates is d and the space between the plates is filled with air (k=1.0). Then, the battery is disconnected. If the distance between the plates is increased to 3d...

Hi .. I have this problem needed to solve I hope can find someone help me.. 1- Is the system of three cubic in pure state <ψABC| each pair cubic in bell state |φ+>? 2- Consider a system of two cubits in state Is the measurement without selecting observable which changes the state of a cubit...

<Mentor's note: moved from a technical section, therefore no template> hey guys, i have a question about a tricky physics 1 problem our teacher gave us today, paraphrased as follows: there is a mass M1 on a flat, frictionless horizontal table connected to a pulley, and on the other side of the...

I am so stressed right now and am on the verge of a nervous breakdown. My chemistry homework is just really confusing and I need to pass this class, could someone please help me out? I need to hand this in tomorrow and I have already answered the questions myself but I feel like my answers are...

I'm revising differentiation for tomorrow, I am hopelessly stuck on some things. I have some examples with answers, but I have no idea which rules are being used. y=2sin3x dy/dx=6cos3x I see that sin goes to cos but why is the two multiplied by the 3 (if that's what's happening)...

Homework Statement Estimate the magnetic field required to maintain protons at 7TeV in the LHC at CERN. The LHC has a circumference of 27 km. State any assumptions or approximations you make. Homework Equations lorentz force, assuming magnetic field is always perpendicular to the direction of...

Homework Statement There is a radioactive source plaed in front of the GM counter to predict the kind of radiation emmitted by the source. 1 : When the GM counter moves 5 cm away from the source, the count rate drops significantly. 2 : When a 5mm aluminium sheet is inserted...

Homework Statement Hello everyone, can anyone help me prove this using tensors? Given three arbitrary vectors not on the same line, A, B, C, any other vector D can be expressed in terms of these as: where [A, B, C] is the scalar triple product A · (B × C) Homework Equations I know that...

Statement: I need a suitable method and factor to investigate ONE factor that affects the angle of refraction. It has to be related to the context of everyday life and glasses, i.e. how glasses are used to focus light and the light focused is that of a refracted ray. Therefore factors such as...

Voltage = 9.0 V, Current = 20 mA, Capacitor (C) = 10 microF, Resistance before (too high) [R_A = R_B] = 10 k Ohms. In a a-stable oscillator, calculating the resistance needed for two resistors (R_A = R_B) to discharge and charge a capacitor (C) so that a LED does not blow. Currently my circuit...

I found this baby bird in the parking lot with no trees above it. I have no idea how it got there. So I brought it inside and I don't know what to do. It keeps opening its mouth. What can I feed it? Is there any realistic chance this thing will survive? Thanks.

I need to solve for the equivalent resistance of the circuit below:https://s.yimg.com/hd/answers/i/7936cef74d9a45cfb7c9f051c19041dd_A.jpeg?a=answers&mr=0&x=1427780127&s=19cab3f26be71f84b6bb2d7d291a5217 Voltage is 100volts. R1=6ohm, R2=8 ohm, R3= 4 ohm, R4=8 ohm, R5= 4 ohm,R6= 6ohm, R7=ohm...

Hi brand new to the site. I keep on having a syntax error when I run the code below on my casio fx-cg10. Btw I also put a display triangle on the last m as well

I really need help with a big Python program. Our professor has been MIA for the whole term and now we need to submit a program. I thought I was doing and learning fine on my own, but the program simply does not work for me. I need it till Thursday and I am ripping my hair out because I cannot...

Problem 1 20 marks (i) ˆx = (1, 0) and ˆy = (0, 1) are the Cartesian unit vectors and the vectors v1 and v2 are defined as v1 = −4ˆx + 0ˆy , v2 = 2ˆx − 7ˆy . Determine the polar coordinate unit vectors ˆr and ˆθ for v1 and v2 and hence express v1 and v2 as a linear combination of ˆr and ˆθ. [4]...

Can someone please explain to me why the answer to the following question is Krypton? A step by step solution would be ideal please! (b)The following reaction occurs in a nuclear reactor: 235U+01n →141Ba+X+301n+202.5MeV (i) Identify the element X. Many thanks! (Question is Q12 b part i...

Homework Statement An aqueous effluent contains 12 M Cd2+ and 10 M Mg2+ as solution of nitrates. Current practice is use NaOH to selectively precipitate the metals. (a) Is it feasible to get 0 Cd impurities in Mg ppt by using NaF instead of NaOH (back up your answer with adequate calculations)...

Hello all I have an exam coming up this week but there's something that I don't understand: Let's take methane, for example. If I understand it correctly, the bonding orbitals of carbon are all hybridized to sp³ orbitals and overlap with the 1s orbital of four H atoms. Does the orbital of...

Homework Statement A cutting tool under microprocessor control has several forces acting on it. One force is F⃗ =−αxy2j^, a force in the negative y-direction whose magnitude depends on the position of the tool. The constant is α = 2.70N/m3 . Consider the displacement of the tool from the...

Homework Statement You get a new job working for a railroad company and your first task is to work out the refuelling strategy and fuel budget for the new trains. Your company has recently purchased charger locomotives which have a mass of 120,000kg and a top speed of 210km/h and run on diesel...

Hi there. I have spent most of today reading and researching entanglement. Most website say something along the lines of if one photon has been observed to have a spin state of up, the entangled pair will automatically become spin down. They also say that if you change of interfere with one...

Homework Statement The problem is f(x) = sin2πx - (1/πsquare)*sinπx and its given Bn sin (nπx) = f(x) Question is find Bn. Homework Equations Bn = 2/L ∫ (sin2πx - (1/πsquare)*sinπx) * sin(nπx/L) where L is 1 The Attempt at a Solution I did [/B] ∫ sin2πx * sin (nπx) - (1/πsquare)*sin...

http://scholarcommons.usf.edu/cgi/viewcontent.cgi?article=4836&context=ujmm Ive been awake for thirty six hours and I don't know differential equations. Im trying to find the angle (theta) over the horizontal axis that is needed to hit a target that is 1000 meters away they are basically...

Homework Statement Using \int_{-\infty}^{\infty}e^{-x^2/2} dx = \sqrt{2\pi}, Integrate x^(5/2) e^(-x) dx from 0 to infinty 2. The attempt at a solution I tried substituting x = u^2/2 but i could not simplify further. Please help me with the problem. Thank you in advance.

Homework Statement A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m-tall building. The bucket is initially at rest, but is traveling at 4.0 m/s when it reaches the top of the building. What is the minimum amount of work that the worker did in lifting the...

Homework Statement A sled starts from rest at the top of a hill and slides down without constant acceleration. At same later time, it is 80 ft. from the top ; 2s after that it is 125 ft. from the top ; another 2s it is 180ft from the top. a.) What is the acceleration of the sled? b.) how long...

Mod note: Moved from a technical math section, so this post doesn't contain the homework template. It seems I can't solve 4th grade questions any more, I'm confused with division vs. subtraction in fractions. Is the solution for question 1 and 2 correct? Disregard the solution for question 3...

[Moderator Note: Thread content restored from archive. Relevant portions of the original attachment have been uploaded and included here] Hello, I am working on a beginner level circuit analysis problem due tomorrow, but my branch current values aren't making sense. I've been struggling to...

Homework Statement I have all of the data but I just can't find the equation to linearize it. X values: 0, 1.98, 3.96, 5.94, 7.92, 9.9, 11.88 Y values: 1.98, 7.13, 9.08, 11.04, 12.57, 14.51, 14.342. The attempt at a solution I know it is not a parabola, cubic, exponential, or inverse.

hi everyone so i am working on an assignment to overall find the efficiency of a small electric motor. i need help with the following things: 1. Factors that can affect efficiency of a small motor (i need to talk about mass as the factor) 2. Why it is important to understand efficiency...

Homework Statement graph the curve C that is described by r and graph r′ at the indicated value of t. I've attached the actual question as a picture as a picture file Homework Equations none The Attempt at a Solution I know x(t)= 2, y(t)=t , z(t)=4/1+t^2 when x=0, r(t)=t+4/1+t^2 when...