What is Mechanical: Definition and 1000 Discussions
Mechanical engineering is an engineering branch that combines engineering physics and mathematics principles with materials science to design, analyze, manufacture, and maintain mechanical systems. It is one of the oldest and broadest of the engineering branches.Mechanical engineering combines creativity, knowledge and analytical tools to complete the difficult task of shaping an idea into reality.
The mechanical engineering field requires an understanding of core areas including mechanics, dynamics, thermodynamics, materials science, structural analysis, and electricity. In addition to these core principles, mechanical engineers use tools such as computer-aided design (CAD), computer-aided manufacturing (CAM), and product lifecycle management to design and analyze manufacturing plants, industrial equipment and machinery, heating and cooling systems, transport systems, aircraft, watercraft, robotics, medical devices, weapons, and others. It is the branch of engineering that involves the design, production, and operation of machinery.Mechanical engineering emerged as a field during the Industrial Revolution in Europe in the 18th century; however, its development can be traced back several thousand years around the world. In the 19th century, developments in physics led to the development of mechanical engineering science. The field has continually evolved to incorporate advancements; today mechanical engineers are pursuing developments in such areas as composites, mechatronics, and nanotechnology. It also overlaps with aerospace engineering, metallurgical engineering, civil engineering, electrical engineering, manufacturing engineering, chemical engineering, industrial engineering, and other engineering disciplines to varying amounts. Mechanical engineers may also work in the field of biomedical engineering, specifically with biomechanics, transport phenomena, biomechatronics, bionanotechnology, and modelling of biological systems.
I am thinking about being a mechanical engineer but there are a few things I wanted to take into account before I picked this field.
First, the amount of available jobs is important.
Second, salary. I'm not a money crazed person but I plan on raising a family. I want to be able to pay...
Homework Statement
At the Chute-Montmorency, water falls from a height of 83m. The average flow rate of the river is 35000 liters per second. Estimate the maximum power that a hydroelectric plant located at the bottom of the falls would provide.
Homework Equations
P = W/T
W = F x d...
I am thinking about being a mechanical engineer but there are a few things I wanted to take into account before I picked this field.
First, the amount of available jobs is important.
Second, salary. I'm not a money crazed person but I plan on raising a family. I want to be able to pay...
I am majoring in Mechanical Engineering, and I found a research opportunity I really want (it focus on Fastening and Joining). I want to take classes relevant to this area, but my university offers different areas to specialize in as an Undergrad, so which one should I focus on in order to take...
Hello,
Has anyone here studied Mechanical Engineering but is doing work related to Biomedical Engineering or in the the Biotechnology or Biomedical Devices industry?
If so, I would like to ask a few questions.
How applicable was a Mechanical Engineering degree to your current work?
Do...
hi!
i'm beginner in the subject of vibrations.
i'm trying to understand the waterfall plots.
i have attached a waterfall plot.
can someone please help me to understand it?
waterfall plots are used when the operating speeds are varying (run up or coast down).
in this plot, as the...
Hi all,
Consider a simple gear system. I want to learn to model this system and write equation for it that any information/state regarding system can be extracted from.
thanks
Homework Statement
A sphere of mass 2kg is release from point A off the edge of a hole that is represented of as a semi-circle of R=0,2 m.
consider g=10m/s²
What is the force that the ground apply on the sphere when it passes trough point B(bottom of the hole?
Homework Equations
Ep=m*g*h...
Is mechanical disturbance an effective method of demagnetization to low coercivity ferromagnetic materials? Other than hammering what other ways are considered mechanical disturbance?
QUESTION
A quantum mechanical system has a complete orthonormal set of energy eigenfunctions,
|n> with associate eigenvalues, En. The operator \widehat{A} corresponds to an observable such that
Aˆ|1> = |2>
Aˆ|2> = |1>
Aˆ|n> = |0>, n ≥ 3
where |0> is the null ket. Find a complete...
Hello, I'm new to this board. I have a engineering question about the coolant pumps used to maintain reactors.
I have been studying the basics of a PWR.
I notice the pumps are fed mostly by electricity.
While I see the logic and efficiency of that..I am left wondering why the space on...
Hi!
For my finally year design project, I intend to try and solve the problems with existing shower bathing aids for the elderly and disabled. I won't go into details of what problems and how, etc, but I will give you an overview of the mechanism I intend to use.
My product is essentially...
I have been looking for quite some time for a source of high quality prototyping parts that I can use to quickly make small to medium sized physical models without having to resort to making one-off parts which eat up time and materials. I think I have found the source here...
Homework Statement
A wooden block is on an incline with θ = 18.5 degrees. The angle was determined to be big enough that the wooden block would experience kinetic friction ( slides down the ramp). A photo-gate was used to measure the time it took for the block to move a certain distance. Five...
I am a mechanical engineer with 2 1/2years working experience. I have a Bachelor degree in Science (Mechanical Engineering). Physics is one of my favorite subject when I was in high school. Even though I already graduated from University, during my free time, I will self study Physics. I have an...
Hi,
Homework Statement
Upon converting rotational mechanical components into their electrical analogs, one thing in particular baffles me. When is a rotational component converted into two sets of dependent sources and when is it converted into a single set? Let me try and clarify my question...
Homework Statement A plastic film moves over two drums. During a 4s interval the speed of the tape is increased uniformly from v0= 2ft/s to v1= 4ft/s. Knowing that the tape does not slip on the drums, determine (a) the angular acceleration of drum B, (b) the number of revolutions executed by...
Homework Statement
What is the total mechanical energy of a 290 kg satellite in a geosynchronous orbit around the Earth?
Homework Equations
W= K + UG where K= 1/2 (mv2) and UG= -(GmM)/r
Fc= mac where ac= v2/r
The Attempt at a Solution
I think the geosynchronous part is what is...
I hope I am posting in the right place. I am a 1st year University student. Although I am undertaking a BSc in Computer and Electronic System Engineering I have a Mechanical Principles module which I am finding a little bit of a struggle.
Mechanical Principles - Dynamics:
a) A diaphragm type...
Hi,
Homework Statement
Attached (Q1,Q2) are two mechanical systems I am asked to convert into analogous electrical circuits. In Q2, it was stated that B4 is the friction between each of the three masses and the surface.
Homework Equations
The Attempt at a Solution
Attached (Q1 -...
Homework Statement
What is the total mechanical energy of a 380kg satellite in a circular orbit 3.0 Earth radii above the surface?
Homework Equations
W= E2- E1
E= 1/2 mv2- \frac{GmM}{r}
The Attempt at a Solution
I'm not sure if the equations above are suitable to solve this or...
1. Homework Statement [/b]
A car is rolling down a ramp that is inclined at and angle of 9.9 degree with respect to horizontal. There is no friction acting from the road on the tires.
Employ conservation of mechanical energy to find the speed of a car that starts from rest and rolls down...
Hey guys,
I am in a teaching assistant in another 8th grade science class for my 2nd field experience in a title 1 school. The teacher is really struggling(*) to explain to the students the difference between Mechanical and Kinetic Energy.
The book their using defines Mechanical Energy as...
Homework Statement
What's the total mechanical energy of a 400kg satellite in circular orbit 1100km above Earth's surface?
Homework Equations
The Gravitational potential energy U=-(Gm1m2)/r
kinetic energy k=1/2mv^2
The Attempt at a Solution
At first i thought i could do...
Homework Statement
Converting the energy of one food calorie into mechanical energy, starting from rest, to what speed could you accelerate a 133-lbs person?
Homework Equations
1 calorie= 4.184J
1 lbs= 0.453592kg
K=1/2mv^2
The Attempt at a Solution
here what I did, I converted the...
Homework Statement
When a .5kg mass is suspended from a spring, the spring stretches 4cm. The mass is then displaced 2cm from its equilibrium position and released.
(a) What is the spring constant? (b) What is the mechanical energy of the mass? (c) What is the speed of the mass as it passes...
Are there anybody doing some research on quasicrystals ,especially its mechanical property?
I am just wondering why so few people are working on it,because intuitively I think quasicrystals will have a bright future.
So what do you think of quasicrystals? Is it worthy of research?
I want...
How long would a EE minor take?
My future plans are this: Either just get the ME undergraduate degree and do a masters in Systems engineering, or get the ME degree and EE minor and then get a Masters in ME, possible specializing in Dynamics and Controls. I've been looking at systems...
Homework Statement
A 58.5 kg child slides down a water slide with a velocity of 1.2 m/sec at the top. At the bottom of the slide, she is moving horizontally, y=1.5 meters above the water. She splashes into the water d=2 meters to the left of the bottom of the slide.
1) Assuming potential...
Here is my problem verbatim.
A mass weighing 100g stretches a spring 5cm. If the mass is set in motion from its equilibrium position with a downward velocity of 10cm/s, and if there is no damping, determine the position \(u\) of the mass at any time \(t\). When does the mass first return to its...
The title may be incorrect, I named this after the section of my book in which this is located.
My problem is as follows.
Determine \(\omega_0\), R, and \(\delta\) so as to write the given expression in the form
\(u=R\cos(\omega_0 t-\delta)\)
\(\color{blue}{u=4\cos(3t)-2\sin(3t)},~\text{My...
I want to be an aerospace engineer, but the university i want to go to doesn't offer it as a major (or master for that matter). So i was wondering if it would be best to first get a bachelor's degree in mechanical engineering then get a master's degree in aerospace engineering (in another...
mechanical design -- cam timing chain versus gear-driven
hey all,
I am a mech-e student, but I am still in the infancy of my degree, so I haven't really had any courses pertaining to this sort of thing, but having work with cars for a number of years, and having what I consider a strong...
Hello all,
I was wondering if anyone is or knows any Mechanical Drafters? I am trying to find out if it is a good career path. Also is there a demand for Mechanical Drafters or is work hard to find?
I am trying to explore some new career options. I was thinking I would maybe start out with...
Homework Statement
Hello all,
I've worked through the problem below, but I feel my answer is incorrect. I would appreciate it if someone could check my work.
Water is pumped from a lower reservoir to a higher reservoir by a pump that provides 20kW of shaft power. The free surface of...
"The Mechanical Universe...And Beyond" - Free Physics Videos Online
My physics (Thermo and E&M) professor recommended the following set of lectures from Annenberg Learner, produced by CalTech in 1985:
http://www.learner.org/resources/series42.html
Scroll down and click the "VoD" button to...
Homework Statement
Using the equation for the final velocity of an inelastic collision, show that mechanical energy is not conserved in the collision. (Do this only with variables.)Homework Equations
Vf = (m1v1i + m2v2i)/(m1 + m2)
KE = (1/2)mv2
TME = KE + PEThe Attempt at a Solution
I honestly...
Homework Statement
"How does the placement of the puncture hole of a stearin engine affect the power output of the system?"
By a stearin engine, it just means an oscillating candle around a fixed point; a video can be viewed at .
I have done all of the data collection by testing...
Hi guys,
I've been trying to resolve the following problem but have worked myself into a frenzy and would appreciate some guidance on how to proceed but also to set my mind completely clear.
The problem is to find the load torque around the fixed pin joint arising from the piston force F_p...
hi engineers
i found very rare videos
https://www.youtube.com/playlist?list=PLz4lzGv7pbZB-w6Zl_0ERvA1Ro3VeMgdo
at https://www.youtube.com/user/MechanicsForAgrEng
i hope you like it for science
Hi all, I've got a question about PhD programs:
I have a BS in Mechanical Engineering, good GPA, and have been working for 4 years since. I will have strong rec's and plan to mostly apply to Materials Science and Engineering PhD programs. I did take the pGRE this spring and scored an 850...
So I have a couple years before I go off to university but I'm picking subjects to study right now. I'd like to do phys/chem/maths but I feel like I should have bio in case I decide to go for med.
However, I'm trying to convince myself that it's pointless but an answer to this question might...
I currently have a bachelor's in physics and I want to get into mechanical engineering. Should I get a bachelor's or a masters in mechanical engineering. I have the opportunity to enter a masters program, but it doesn't seem to make sense to me that they would accept me into the program...
I am going to be entering college as a freshman this fall and planning on majoring in mechanical engineering, but I have plenty of free time until then (~two months) and want to acquire some skills that are essential (or just useful) to the field. I'm interesting in things that would be to my...
What is the total mechanical energy (self energy) of the universe that is due to the fact that it expands, taken the big bang as the origin - on the basis of general relativity?
If anyone could supply me with the equation and number (what size is it in kgm2/s2) I would be very thankful.
Hi, so I'm a junior pursuing a B.S in physics but I'm thinking that might not be enough to make me competitive. So I am thinking about minoring in mechanical engineering to make me more competitive. The thing is I'm not sure if it will even matter in the job market. I want to wait a bit to...
hi all
I am asking this question for a friend and I hope some of you will give me the right answer.
if someone is thinking about pursuing a career in Mechanical engineering ,does he have to be worried about hand-drawings in case he is not a good painter?
or all drawings will be done on the...
Hello, this is my first post on physics forum. I really want to learn to design car parts, from engine blocks to wish bones. From what I've found it seems like mechanical engineering would definitely be useful for a foundation, but I just want to make sure there isn't a field more specific I...