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Engineering
Engineering is an art and profession devoted to designing, constructing, and operating the structures, machines, and other devices of industry and everyday life.
5,839 Questions
Why in space ink or other pens wont work?
Thank you ever so much, i mean i have to do this for school and no one has any idea but you do so thanks alot for this answer.
Since no one has actually provided an answer, let me give it a "shot": Any pencil lead dust or fragment broken off in the zero gravity could be inhaled by the astronaut or get into the instruments inside the capsule before they could be filtered out. Please, someone confirm?
What is the value of Young's modulus for aluminum 6061?
Depending on which source you consult, the expected value is betwen 120 and 130 Gpa. On the net it is possible to find the answer in psi (pounds per square inch) but I assume you require a value in SI units. We have just done a classroom experiment which returned a value of about 80 GPa. The stress strain graph looked like a typical ductile material graph, straght line followed by a curve as defopration became plastic. Our value was obtained using the eleastic straight line section. I suspect our low value was due to some 'give' in the anchorage of the specimen wire.
Mechanical energy is a term that is used to describe?
Mechanical energy is the sum of kinetic energy and potential energy of some object. So any object in motion, has potential to be in motion, or has both has mechanical energy.
Your car in motion has kinetic energy and potential for more kinetic energy in the gasoline that it runs on. So your car has mechanical energy. Or you up on the three-meter diving board at the pool have potential for kinetic energy when you take a swan dive off that board. You have mechanical energy there.
But, bottom line, pretty much any object that is either in motion or can be put into motion has a form of mechanical energy.
What are the physics behind Skee-ball?
When a pitcher throws a curve ball he grips the ball with his fingers to impart spin on the ball when he thows it toward the batter. This gives the ball two motions i.e. forword velocity and spin. If the spin axis is in the vertical plane (i.e. updown )the pitch will rise if it is spining clockwise (i.e. toward batter) and fall if counterclockwise(i.e. away from the batter). If the spin is in the horizontal plane clockwise spin will(i.e. toward the batter)the ball will cause the ball to move toward the 3rd base side of the batter. If the spin is clockwise (i.e away from the batter) the ball will move toward the 1st base side of the batter. The reason for the ball movement is the air is moving over one side of the ball faster then the other causing lift or a aerodynamic force in the direction of movement. This force is caused by the spin on the ball. Think about the air on one side as moving at the speed of ball forward velocity plus the spin velocity and the other side as moving at ball forword velocity less the spin velocity. Various grips, arm positions, release points will then make the ball look like it is a dancing curve.
What are the advantages and disadvantages of spiraltube heat exchangers?
Advantages of shell and tube heat exchanger are:
* Its compact design * Capability of withstanding high pressure
Disadvantages:
* It is difficult to readily inspect the shell side of the tubes for scaling or tube damage
Is biotechnology a medical subject or an engineering subject?
Biotechnology could combine both subject matter from medicine and from engineering. Biotechnology is based in biology. But it is often used to refere to genetic engineering. Biochemistry, organic chemistry or chemical engineering can play a part in biotechnology. A link is provided to the Wikipedia article on biotechnology. Surf on over and just read the first paragraph and see what kind of picture you come away with.
How do you make an inside taper on a lathe?
These are the basic steps used to machine an inside taper on a lathe:
- The required boring bar is inserted into the tool post and the work piece is bored to the smaller size of the taper
- The tool post is set to the required degrees (the boring bar angled towards the work piece)
- Using the tool post slide (or compact slide) hand wheel, it is turned in a counter-clockwise direction to allow enough travel over the entire taper length
- Now the tool tip is moved towards the edge of the workpiece bore with the carriage and cross slide hand wheels
- At this point the tool post slide hand wheel is used and turned in a clockwise direction to start cutting the taper a few millimeters at a time until the taper is roughly 2mm undersize
- Mechanical blue is put onto the mating test piece then the test piece is inserted it into the taper to check if the degrees match. Where there is more rubbing, the tool post degrees are slightly adjusted by using a dial indicator and a note of the adjusted amount set is made.
- Another cut is made and the taper is re-tested using the same method. If it requires further adjustment, the process of adjusting the angle with the dial indicator is repeated and. The dial indicator is placed in the exact same spot as before.
- When the taper matches the test piece, the final cuts are done with a very smooth, continuous motion on the tool post slide hand wheel.
- The workpiece may be retested with test piece after every cut to ensure precision of the final piece.
The above method is just a basic explanation of how the operation is achieved. Operating a lathe without proper training is not recommended and could lead to serious injury!
Which mineral is mined in Sudbury?
Nickel....Sudbury is the nickel capital of the world and is home to the worlds biggest nickel coin ($0.05)
What do you call a space between two mountains?
The space is called a vally
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Actually it depends on what you mean by "between" . the actually space that lies between two mountain tops is called a saddle. Thinking of a valley as the intersection where the two sides of two mountains merge is a bit of stretch but could be true. In that case, the valley originates at the saddle which often forms a valley on opposite sides.
Why is electric current a scalar quantity?
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough. The quantity should obey the laws of vector addition too. Like the triangle law or the parallelogram law. As we know, if two currents meet at a junction, the total current of the resultant current will be the algebraic sum of the two current and not the vector sum.
Sometimes, treating a current like a vector makes sense, like when the current though a conductor induces a magnetic field.
Why can't you earth a DC circuit?
Your question is better expressed as why can an ac circuit be shorted to earth when a dc circuit can't be? With an ac supply only the positive feed is actually present at the socket. There is no negative, just a neutral return which is actually connected to earth at the power station / substation. Earthing an ac curcuit just provides a shorter route to the earth, which is where it would have gone anyway. The earth connection at the socket is just to provide a safe means of dumping the current locally in the event of a fault. In a dc circuit the current has nowhere to go, other than to the negative terminal / rail. Without both positive and negative being present no circuit can be formed.
How do you calculate brake pedal force and deceleration?
when breaks are applied for moving car whose velocity will be decreases and finally car will be at rest position
acceleration = (final velocity - initial velocity)/time taken
= (0-u)/t
= -(u/t)
negative acceleration is called deceleration
deceleration = - acceleration
chennakesavarao@itimes.com
Well, to the best I can understand (I'm just learning this stuff, so sorry if I'm wrong) It would be a n-type if you doped the Ga, (i.e. replace a Ga atom with a Si atom, as the Si has an extra electron that would be forced to go to the conduction band. If you doped the As with the Si, it would be a p-type as there would be one fewer electron than normal.
Programs to implement operations on doubly linked list in C?
Stack is an abstract data type that allows you to input and output data in a way that the first data which was placed in the stack will be the last one to get out. We use physical examples of stack in our daily lives such as the stack of dishes or stack of coins where you only add or remove objects from the top of the stack.
You can see the whole source code implementing the stack in related links, below.
What are the important components of a nuclear power plant?
There are other complication to nuclear power, importantly that there must be a neutron source, and so, for example, uranium must be enriched to increase the number of neutrons, as its neutron source is uranium-235, which is not present in sufficient quantities in naturally occurring uranium.
An angle of attack is the angle between the chord line of an airfoil and the airflow over it.
An electric current is the measure of what?
An electric current is a movement of charges, and it is measured in amperes or just amps. An ammeter is used to make this measurement. Current flow is a scalar quantity, and it refers to the number of charges passing a given point per unit of time.
What is the name of a person who operates a milling machine?
A person who operates a milling machine is called a milling machine operator, milling machinist or a machinist.
What is difference between core and processor?
A processor, or more commonly a CPU, is an individualized processing device. It may contain multiple cores.
A core is a bank of registers and dedicated cache structure that performs all of a processor's tasks, but is not an entire processor. For example, more multi-core processors have a separate array of logic functions that are not integrated with the core, such as the Memory Controller in AMD Phenom and Phenom II processors. There is one (or two, in the Phenom II) memory controllers total for the processor, reguardless of the number of cores.
Think of a 'core' as a cylinder in an engine. A V8 enginer has 4 'cores', but the engine is the 'processor'. You can have a V12 or a W32 or a V4 or any of another combination, but there's only one processor. However the number of cores can greatly influence the overall power and capability of the processor.
What does an engineering team need in order to test a new design?
If the design is known and communicated to the testers the test team can decide on a strategy that will most rapidly and effectively cover the functions to be tested.
The opposition to the flow of electrons through a conductor?
In the simplest case, that would be resistance - but there is also another type of opposition (only relevant for AC) called reactance. The combined effect of resistance and reactance is called impedance.
Materials required to construct robot for students level?
what age?
"robot" is a VERY generic term. they can range from Lego mindstorms (great for students around age 8) to robotic arms (great for students around age 19).
likely you're looking for something like this: http://www.parallax.com/tabid/411/Default.aspx
How many horsepower did Apollo 11 have?
Apollo 11 was the name of the spaceflight as a whole, the rocket used was the Saturn V (Saturn 5).
Figures of around 160 million horsepower at its peak have been brandished about, but a rockets power should really be measured by the thrust, in terms of pounds-force or Newtons. At its peak, the Saturn V rocket produced 7,648,000 pounds-force (34 million Newtons)
