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Mechanical Engineering
Mechanical Engineering is a branch of engineering that encompasses the generation and application of heat and mechanical power and the design, production, and use of machines and tools. Mechanical engineering involves application of the principles of dynamics, control, thermodynamics and heat transfer, fluid mechanics, strength of materials, materials science, electronics, and mathematics.
10,989 Questions
King Alexander III died in the 1300s. On a stormy night at Edinburgh when he safely crossed a river he went off without his guard. Then the horse he was riding on got scared from lighting and threw him off down a cliff and banged his head going down the cliff and then died...
Can visible light travel faster in a vacuum than both xrays and radio waves?
No.
We call it the "speed of light", but it's also the speed of radio, X-rays, heat,
ultraviolet, microwave, gamma rays, etc, and all forms of electromagnetic radiation travel at the same speed, as long as they're in the same medium (vacuum or material substance).
What are science apparatuses and uses?
There is the Bunston Burner witch burns things if you need to make a mixture like acid and zinc and with a bunston burner you can see the gas it makes the microscope zooms in 5x 10x 15x 20x
This a learned skill, basically it is very similar to some of the skills learned when gas welding. Both processes require a source of heat to melt the base metal and a separate source of filler material . Both require the use of two hands. The exception is when you are fuse welding. Melting the edges of two pieces to flow together.
What caused the lost plane to crash?
The plane was having engine problems from Florida to South Carolina. The magneto in one of the twin engines was bad. The pilots informed the band and crew it was safe to fly on one engine to Baton Rouge, LA where a mechanic was waiting to repair the faulty engine. On Oct. 20, 1977 near McComb, MS , the pilots switched the fuel to burn richer thus causing them to run out of fuel and crash.
How does a Coal Power station produce electricity?
Why shear force and bending moment is zero in trusses?
An ideal truss has pin joint connections, allowing laod to be taken only in tension and not in bending or shear.
In reality, truss joints are not pinned, and do carry some moment and shear, but because tensile stiffness dominates, the moments and shears are small and called secondary.
Both 31 and 32 gauge are close:
- 31 gauge = 0.0105"
- 32 gauge = 0.0097"
How the servo potentiometer works?
A potentiometer is another name for a variable resister used for voltage dividing. Potentiometers have three tabs on them The two outer most tabs have the full resistance of the device across them. The center tab is connected to the wiper that slides across the surface of the resister. A voltage is applied to the two outside tabs on the potentiometer. A voltage of your choosing will appear across either the left tab to the center wiper tab or from the right tab and the center wiper tab. A potentiometer of this type is used to control the speed output of variable frequency drives. A 10K potentiometer has 10VDC applied across the two outside tabs If the drive sees the full 10 volts it allows the drive to go to full output and the motor will run at full speed. With the potentiometer's center tab wiper at half position a voltage of 5 VDC will appear to the drive. When the drive sees the 5 volts it tells the drive to go to half speed output and the motor will run at half speed. This potentiometer is linear so no matter where the wiper is positioned, the motor speed will follow the potentiometer settings from 1% right up to 100%
The portion between the fulcrum and the effort applied in a lever is called effort arm.
Difference between Pneumatic and hydraulic test?
There are many differences, and here are a few:
Pneumatic systems use gasses which are compressable - hydraulic uses liquids that are non-compressable.
Hydraulics' motion is slow and smooth - pneumatics' motion is quick.
Pressure can range from 500 to 5000 psi - pneumatics operate at around 100 psi.
What was the spinning jenny made out of?
it was made out of wood
and the inventor got the idea from his daughter when she knocked over the wheel from there spinning wheel and the wheel kept on going so this lead to the spinning jenny its just like a spinning wheel it just dose more thread at once and its faster and it was a times saver back in the 1700s or 1800s
Do people use the Spinning Jenny anymore?
It's a spinning wheel - you can use it to make yarn. is a spinning whell you cna use it to make yarn, and ya
What is the history of the pulley?
the pulley was invented in ancient Sicily around 250 BC.
The ancient Egyptian wooden four lobe pinion pulley was used to construct the Giza Pyramids around 2600 BC.
This pulley surrounds its load and is unlike anything in the modern world.
It operates with a mechanical advantage of 2.8 (MA=2.8) on the CLASS 2 lever principle.
When hoisted the pulley with load rotates and climbs stepped structures with positive engagements of pulley lobes with steps.
This is earliest machine known using "rack and pinion" mechanical technology.
Google four lobe pinion pulley
How were levers used in ancient times?
Yes, The Shaduf was used. A Shaduf is what the Egyptians used to collect water.
What is the Fastest plane in the US air force?
The F-15 Eagle is one of the worlds fastest operational fighter jets with a top speed of Mach 2.5.
The Lockheed YF-12 interceptor, one of the predecessors of the SR-71 "Blackbird" was approved for acquisition by the USAF back in the 1960's, but due to government intervention the order for 100 planes was canceled. The YF-12 was reportedly capable of Mach 3.35.
Denis Papin, a French inventor, appears to have built the first steam powered boat in 1690.
John Fitch built and operated the first commercial steamboat in 1788, on the Delaware River in the U.S., but it was a commercial failure.
In 1807 Robert Fulton's Clermont was the first commercially successful steamboat, running a regular passenger route between New York City and Albany, New York.
Click the link below for a good Wikipedia article on steamboats.
What are the most important ancient Greek inventions?
gymnastics,water technology ------------------------------------------------------------------------------------ The steam engine was invented by Heron, an ancient Greek geometer (mathmatecian who specialized in geometry) and engineer from Alexandria. Dikaiarch of Messina (350-290 BC) a Greek geographer introduces to the map making world the notion of latitude and longitude. There are many other inventions, sech as the water screw by Archimedes, which would move water upward or downward in a corkscrew motion.
Swirl nozzles inject the liquid in tangentially, and it spirals into the center and then exits through the central hole. Due to the vortexing this causes the spray to come out in a cone shape.
Source: Wikipedia searched nozzles. Look under spray nozzle.
What type of aircraft is air force one?
Air Force One is the call sign used describe any aircraft carrying the US President, so in theory Air Force One could be any type of aircraft.
The official Presidential fleet consists of two customised Boeing 747s, either of which may be colloquially referred to as Air Force One. However this only becomes the official designation when the President is on board.
