Mechanical Definition and 1000 Threads

ok, I know that being further away and using a fulcrum/pivot point from an object being moved takes less energy. i.e using a 4 foot crow bar to pry open something. But i can't grasp the concept of why being further away makes it so much easier. thanks

Many textbooks use the double slit experiment to introduce quantum effects. However, all texts I know use handwaving arguments instead of the whole formalism of QM. Especially dynamics is completely omitted. I don't expect that a complete microscopic description -including the walls- has been...

I was told that M.E is one of the hardest, if not the hardest, engineering fields, so my question is, is E.E any easier than M.E ?

Hi all, I was recently given a project at my college intership where I am supposed to model a mechanical singe vane rotary vacuum pump mathematically. The objective of the analysis is to find the work required to run the pump and the resulting net loss of energy from the system. I was told...

Hi, I was wondering that if one disliked Physics I (Mechanics & Waves), would they hate mechanical engineering as well? How closely related are the two? Here is the curriculum for my Physics I course: "The basic laws and principles of Newtonian mechanics; oscillations and waves". So kinematics...

A 30 kg child is playing on a swing. Another child is pushing. That second child does 75 J of work on the swing. Ignore friction. The swing has zero mass compared to the child on the swing. There is a diagram. So basically: Postion A Height = .6 m. Position B Height = .2 m and Postion Height C...

The 120 kg roller coaster just makes it to the top of hill A that is 15 m above the ground. It moves forward, picking up speed towards location B which is only 3 m above the ground. What is the total energy of the roller coaster as it passes location B, C, and D? Note: the velocity at the top of...

Hey guys. So I came here to ask a couple of questions that you guys probably know the answers to. Basically, I am a high school senior and I took physics in my junior year, and I loved it so much I took it again in senior year (this time just a higher level course). I'm really loving it. I ace...

me and my father are working on a new project for his company and we need a supplier which has a big variety of parts and sells for low quantities. i will be glad if anyone can recommend me on good suppliers =>

Hello, Is it possible to get into master's program for electrical engineering (in North America) after completing a bachelor's degree in mechanical engineering? The reason being is that I plan to pursue a bachelor's in mechanical engineering because that's the 'safe' degree for where I live...

Homework Statement Hello this is my first post. Im currently studying towards a level three national diploma in engineering operations. I need some assistance with a mechanical principles problem. ( A crude drawing of the problem has been attached haha) I need to work out the direct and...

My first post here. :D usually this situation does not arise, but I am working on thin piezoelectric films. When a apply a alternating voltage on the electrodes, the film vibrates. Now this constitutes a LCR circuit which has a resonant and anti-resonance frequency. Since it is vibrating, it...

I'm watching MIT 8.02 electricity and magnetism () and the lecturer says that there is a derivation of ohm's law but it uses quantum mechanics which is outside the scope of the course. Does anybody know of this derivation and can point me to it? I searched around but can't find anything

Hello, I wasn't sure where to put this questionnaire, because it says on top do not post homework, but then again, I need to ask real engineers and the other forum is for undergraduates ( I think). Anyway I need to interview a mechanical engineer for my careers class, and I had been hoping that...

Hello, I am currently a second semester sophomore studying Mechanical Engineering thinking about studying Physics at the graduate level after my undergraduate degree is done. My main inquiry is regarding the transition from Mechanical Engineering to Physics. How hard is it exactly (if at all)...

I want to start modeling mechanical systems, something say on the order of a motor, input torque only needed, driving a crankshaft that drives a piston. I'm looking to examine the forces generated in the crank, connecting rod and piston. I was wondering what open source Linux packages are...

So, I had this idea for passive safety. Break-apart rods (zirconium with low-melting point metal inserts for example) which go through reactor core at regular intervals, are tensioned by springs, and in the event of overheating, are torn apart, operating simple (springs, latches) mechanisms to...

in bomb blast is mechanical energy conserved or not if so then why?

Hi, I am looking for a 115 VAC motor (able to be plugged into an ordinary power outlet) that is capable of raising and lowering a load of up to 150 lbs. (attached to a cable and a pulley) at the speed of 6 inches per second. I want the speed to remain constant even if the load changes. How can I...

Projectile motion and mechanical energy and a bunch of other stuff...help

I have known for many years that the speed of sound (usually quoted ≈340 m/s) and the speed of light (usually quoted ≈3*10^8 m/s) are vastly different. Doing some reading, I would seem to conclude that part of the reason for this is the fact that sound is a mechanical wave, propagated through...

Homework Statement what distance x from the axis of variation O should be 1 kg slider, the system oscillations period is 0.9 s? T=0.9 s; the spring stiffness k=75 N/m; slider mass m=1 kg; beam mass m=3 kg; Homework Equations I\varphi(over letter "..")+k\varphi=0 \varphi(over...

Homework Statement The motion of a particle is expressed by a=42-12x2 where a is in m/s2 and X is in m, with the initial condition: v=0 when x=0 and t=0 Determine v when X=6 Determine X when v becomes 0 again Homework Equations I tried using a=dv/dt so i took the anti derivative of a...

Homework Statement If in Joule's paddle wheel experiment a block of mass 10 kg is allowed to fall through 22.5 meters and the mass of the water is 50 grams. What is the total increase in temperature of the water? Can your value of J be used for determining how much mechanical energy can...

Homework Statement When a mass M hangs from a vertical wire of length L, waves travel on this wire with a speed V. a) What will be the speed of these waves in terms of V if we double M without stretching the wire? V=? Good morning, could someone please tell me why my answer of rad...

(I apologize ahead of time If I posted this in the wrong section) I'm in the process of starting an import business. I'm trying to do some market research and need some help, since I don't know too many mechanical engineers myself I want to know if any of you have any experience with these...

So there are some things that I feel are important for engineers to just know. Though the questions are basic it may help students with some fundamentals. QUESTION 1 A cantilever beam is loaded at its free end as seen in the attached Figure. What and where is the maximum normal stress...

Given: Mass= 5 kg Vo= 40 m/s Vf=50 m/s s=150 m Ho=0 Hf=50.2 m g=9.8 m/s/s friction=6.26 N θ=30° *You will probably not use all of these values* What percent of initial total mechanical energy is lost during the round trip? (a block (with mass m) going up an inclined plane, and...

Hi all I am happy to announce that I have made it into the industry. Of course the learning train never stops and I will need to think about a masters. What I have noticed is that there seems to be a greater need for ME and EE in industry than NE. With that being said do you think it...

I mean when we're getting into higher level courses and real life, what are the more applicable subjects in math for mechanical engineering? I'm not asking for myself but for a friend. He wants to get into Computational Fluid Dynamics and would like to prepare himself better during his...

Hey guys, I am kinda in a dilemma here about applying to Waterloo (I'm currently in high school present in Ontario) for mechatronics or mechanical engineering. I was wondering if you guys could help me out with some experience in engineering in general and such to make an informed desicion...

Relativistic correction to quantum mechanical system: quantum well with a particle moving in high velocity relative to lab frame (the well moves together with the particle in it). Without relativistic correction there will be a probability for the particle to be outside the well since it's...

Homework Statement A 1.0 kg projectile is fired from a point on the Earth's surface at an angle θ = 45° with the horizontal and with an initial velocity v = 30 m/s. Neglect any effects due to air resistance and find: a) What is the kinetic energy of the projectile when it reaches the...

Homework Statement Problem 1: A standard-sized and typically able college-age human walks into a building for an appointment on the 10th story. The elevator is broken. She walks up the 9 stories. Roughly speaking: (a) How much mechanical energy does she need to expend to climb those 9...

Loss of mechanical energy due to friction - ?? Homework Statement Here, ill post the problem as a picture below, so you have all the info. Homework Equations The Attempt at a Solution I am having trouble with a: Since I don't have to worry about angles, and that the...

Homework Statement Find the general solution for the differential equation Homework Equations y'' + 16y = tan(4t) The Attempt at a Solution I get C1cos(4t) + C2sin(4t) = 0 for my homogeneous equation. I did the usual method of undetermined coefficients (I think I took all of the...

Hey everybody! I'm in my Junior year of undergraduate Mechanical Engineering and am trying to figure out what direction to focus my studies (mainly what industry to focus my pursuit for next job/internship)... Does anyone know of any fields/industries where an engineer can utilize...

This year, I will apply for University of Waterloo, and I am quite certain that I will attend this university. But I have been having trouble of deciding my major. Of course, I don't want you to determine my major on in stead of my self! I am asking for advice. I really liked playing with...

I'm currently a Mechanical engineering major in my junior year. My current GPA through my sophomore year is 2.75 (2.4 for Major) (yeah my humanities are keeping me afloat..hmm). I was thinking of switching to Economics or Business but i just don't think i'd enjoy those either. I found that...

Dear Fellows I am just going to start my PhD in Mechanical Engineering. Can you people suggest me, which area should I choose? That will be interesting and challenging... Any Suggestions PLEASE... Saqib.

Dear Collegues, Can you help me to answer theese : Describe the mechanical energy of the oscillating system, with the special interest in the equilibrium and extreme positions. And can u tell me please, that, what is angular frequency in this topic?

Hey, I am currently a sophomore Civil Engineering student, however I'm not sure whether I should be studying civil or mechanical (based off what I want to get into). Basically, I want to specialize at some point in the structural aspect, however, I know each field branches off into this...

Homework Statement The mechanical advantage of a lever is 0.08; force is not amplified, it is simply diminished; distance, however, is increased: Work input = Work output F x d = F x d F x d = 0.8F x ?(d) This must be a really basic question, but I'm compelled to ask as I'm somewhat...

Homework Statement If a lever has a mechanical advantage of 0.5 - does this mean the input force is not amplified but halved? Homework Equations The Attempt at a Solution

As I understand it, J's MEoH is the calorific value of a substance. The standard value for this constant is given for raising 1 lb or kg of water by 1 degree. I am using equations which use J's MEoH but with other substances. The equations come from a book on steam turbines so they no doubt...

Hi, what do you suggest me? I prefer something relevant to energies (wind, solar etc) and to be something who i can found many info on the web to help me with my project.

Which is harder? The MS Mechanical Engineering program I'm just starting seems pretty intense and heavy on physics. I'm currently working in AE, but I chose ME for a variety of reasons. Is a MS program in Architectural Engineering equally heavy in physics and theory, or is it more practical...

Hey guys, I am currently working on a project and need to model the tubing configuration as shown in the first attachment. Experimental testing has been completed and I have detailed data for the strain and vibration velocity as required. I need to model this in ANSYS to compare the...

Oscillating mechanical systems. find maximum velocity and acceleration !? A mass of 0.3 kg is suspended from a spring of stiffness 200 N m–1. If the mass is displaced by 10 mm from its equilibrium position and released, for the resulting vibration A) Calculate maximum velocity B) Calculate...

Hi Everyone, I m confused which engeenering field shud i choose,electrical or mechanical.Which is the main difference b/w thm and wat types of jobs both offer.also, which one is harder. Hoping for discriptive answer.Thank you.