Mechanical Engineering

Young`s modulus of aluminum is about 70 GPa, or 10.3 x 106 psi.

120

Since the measures of the angles of supplementary angles add up to 180, 60 plus something else equals 180. 180-60=120

Pressure pipes and gravity pipes are two different types of pipes used in plumbing systems. The main difference between them is how they move water. Pressure pipes use pumps or other pressure sources to move water through the system, while gravity pipes rely on the force of gravity to move water downhill. The choice between pressure pipes and gravity pipes depends on factors such as the terrain, water source, and desired water pressure.

You build a basic car, with a body and a way to support the front wheels and the back wheels.

Each set of wheels should be firmly attached to an axle, maybe a piece of dowel, so

that when the axle turns, so do the wheels.

Then you need some way to

attach the end of a strong rubber band to the middle of each axle so that

when you rotate the wheels, the rubber band winds around the axle and

stretches tight.

You can do this with a small nail or screw put carefully

through the dowel. The best way to wind the wheels is probably to push down

on the car while you push the car along a surface, like carpet.

once the rubber band is really tight,

you let the car go, and the stored energy in the rubber band unwinds the

axle, and off goes the car

You don't have to have the band wind around

both axles ... you could make it either just frontal drive or

rear-wheel drive, but it probably goes better if you use both axles.

You

could also use two rubber bands, one for the front wheels and one for the

back wheels, with the ends of each rubber band fixed to the middle of the

car.

Remember, the car will go fastest and the most distance if you use a

really BIG strong rubber band, and can wind it up around the axles really

really tight. But if you make it TOO tight or too strong, the car or the axles might break when you wind it up, which is not good and really annoying.

Another way of making a car like this is to make it like the rubber-band

powered toy airplanes. Make a light frame with 4 wheels, and buy a little

toy propeller or take it off a toy airplane, then wind up the rubber band

by winding the propeller. Then when you let go the propeller, it will drive

the car along.

The short answer: Cost effectiveness.

The long answer: Employing water as a hydraulic fluid is entirely possible for many applications, but produces several additional challenges which will dramatically and likely prohibitively raise the price of the apparatus. For most applications, the higher costs will represent an unmarketable product.

The issues include:

Viscosity: Water has a much lower viscosity and higher specific gravity than hydraulic oil. This results in at least 3 other issues. First, the piston and cylinder materials (usually steel) will erode much quicker due to the resulting higher velocity and more turbulent flow. Second, the use of special valves will be required to prevent the mechanical shock caused by abrupt fluid flow stoppage inherent to water. Third, the lower viscosity also means it will be more difficult to prevent leaks, requiring more stringently machined parts with much finer tolerances.

Bacteria: A closed water system can provide a breeding ground for all kinds of microorganisms. This can result in clogged lines, filters and a potentially unsafe/unhealthy condition in the event of a leak.

Corrosion: Oxygen in the water as well as sulfurous by-products from bacteria can potentially corrode component materials.

Temperature Range: Water freezes at 32 degrees Fahrenheit. If freezing occurs, and due to the non-compressible nature of ice, it will almost certainly damage or destroy hydraulic parts. Anti-freeze agents will need to be utilized at the cost of the inherent environmental and toxicity concerns of such substances.

Lubricity: Water's comparatively low lubricity will lead to increased contact friction and resulting wear of components.

All of these issues can be addressed and overcome, with the disadvantage of dramatically higher cost vs. hydraulic oil.

As with any other rotational system in a belt drive during rotation, the belt is subjected to centrifugal force. Due to the centrifugal force the belt is thrown outward from the grooves of the pulley and causes additional tensioning of the belt. The effect of centrifugal tension is that it reduces the pretension of the belt and hence increases belt slip.

There are no building standards for structures that include designs for withstanding volcanic action. If a building could somehow survive the blast and the intense heat as well as seal out the toxic gas, it would have to withstand being buried in molten lava.

Tempered steel is not a classification of steel. It is a term used to indicate that the steel has undergone proper heat treatment in which case..yes, the steel that has been properly hardened and tempered would be stronger. This answer assumes that the high carbon steel is in its annealed state and has not received heat treatment and tempering of its own.

Please see BS 970 for detailed description.

The chemical composition is:

- C: max. 0,2 %

- Mn: 0,5-1,o

- Si: max. 0,35

- S: 0,04

- P: 0,04

- Cr: 0,75-1,25

- Ni: 1,0-1,5

- Mo: 0,08-0,15

The earliest historical record of a reservoir pen dates back to the 10th century. In 953, Ma'ād al-Mu'izz, the caliph of Egypt, demanded a pen which would not stain his hands or clothes, and was provided with a pen which held ink in a reservoir and delivered it to the nib via gravity and capillary action. Al-Mu'izz commissioned the construction of the pen instructing: : "'We wish to construct a pen which can be used for writing without having recourse to an ink-holder and whose ink will be contained inside it. A person can fill it with ink and write whatever he likes. The writer can put it in his sleeve or anywhere he wishes and it will not stain nor will any drop of ink leak out of it. The ink will flow only when there is an intention to write. We are unaware of anyone previously ever constructing (a pen such as this) and an indication of 'penetrating wisdom' to whoever contemplates it and realises its exact significance and purpose'. I exclaimed, 'Is this possible?' He replied, 'It is possible if God so wills'. [1] The earliest historical record of a reservoir pen dates back to the 10th century. In 953, Ma'ād al-Mu'izz, the caliph of Egypt, demanded a pen which would not stain his hands or clothes, and was provided with a pen which held ink in a reservoir and delivered it to the nib via gravity and capillary action. Al-Mu'izz commissioned the construction of the pen instructing: : "'We wish to construct a pen which can be used for writing without having recourse to an ink-holder and whose ink will be contained inside it. A person can fill it with ink and write whatever he likes. The writer can put it in his sleeve or anywhere he wishes and it will not stain nor will any drop of ink leak out of it. The ink will flow only when there is an intention to write. We are unaware of anyone previously ever constructing (a pen such as this) and an indication of 'penetrating wisdom' to whoever contemplates it and realises its exact significance and purpose'. I exclaimed, 'Is this possible?' He replied, 'It is possible if God so wills'. [1] The earliest historical record of a reservoir pen dates back to the 10th century. In 953, Ma'ād al-Mu'izz, the caliph of Egypt, demanded a pen which would not stain his hands or clothes, and was provided with a pen which held ink in a reservoir and delivered it to the nib via gravity and capillary action. Al-Mu'izz commissioned the construction of the pen instructing: : "'We wish to construct a pen which can be used for writing without having recourse to an ink-holder and whose ink will be contained inside it. A person can fill it with ink and write whatever he likes. The writer can put it in his sleeve or anywhere he wishes and it will not stain nor will any drop of ink leak out of it. The ink will flow only when there is an intention to write. We are unaware of anyone previously ever constructing (a pen such as this) and an indication of 'penetrating wisdom' to whoever contemplates it and realises its exact significance and purpose'. I exclaimed, 'Is this possible?' He replied, 'It is possible if God so wills'. [1]

in carbon steel it will weigh 3,267.2 lbs.

For weight of we have to know:-

1. volume (in cubic centimeter)

2. density

so now

1 inch = 2.54 cm

96 inch = 96*2.54=243.84

120 inch = 120*2.54=304.8

so

volume=(2.54*243.84*304.8)=188779 cubic cm

density = 7.8g/cm3 (varies based on alloying element from 7.8 to 8.05)

now mass= density*volume

m= 7.8*176980.29=1472476.022 gram= 1472.5 kg=3246.25 lbs (depends on density)

Black Friday, the lifestyle of current celebrities.

Bull hocky easy! If you want to plan a job and make a bit more you have to know how to add. The test is: You have to start wiring a home from the main panel plans and add six inches at an outlet box. You measure to the next box and so on to the last box in that circuit then go back to the panel and start on the next line of outlets. How much wire do you need?

The purpose of both the valves is same - that to maintain a certain level(in a vessel or tank...) Simple Level valve could be referred to an ON - OFF valve where as control valve could be referred to an analog type of valve. On - OFF valve is for a crude control of level, while control valve is used where a fine level control is needed.

Yes there are differences.
See these two links for comparison.


NPT http:/en.wikipedia.org/wiki/National_pipe_thread

BSPT (PT)
http:/en.wikipedia.org/wiki/British_standard_pipe_thread

Manufacturing is a specific branch of mechanical engineering that deals with manufacturing processes.

As low as 126 degrees Fahrenheit, diesel fuel could potentially catch on fire. This is known as the temperature of ignition.

The density of mild steel is 7,861.093 kg/m³ (490.751 lb/ft³ , 0.2839 lb/in³)

http://en.wikipedia.org/wiki/Carbon_steel

Compare with 0.28333 lb/in³

Pressure Vessel Handbook 13 Ed.

by Eugene F. Megyesy

pg 388

ISBN-10: 091445823X

ISBN-13: 9780914458234

Airplanes over the past 90 or so years have changed a lot. We have gone from small, propeler driven, fragile, all fabric and wood, 100mph top speed aircraft only able to reach 200 feet in the air at most, to all metal jet aircraft that can double the speed of sound at up to 60,000 feet up.

Air conditioners are rated in three ways, by B.T.U.'s, tons of refrigeration, or by horsepower. One ton of refrigeration removes the amount of heat needed to melt one ton of ice in 24 hours. One ton of refrigeration can remove 12,000 B.T.U.'s of heat in one hour. The B.T.U. is the amount of heat needed to raise 1 lb. of pure water 1 deg F.

Dude you need to be quite dumb to ask that question! An automata is simply a hand-cranked machine usally made out of wood. Keep that in mind or else....

Astm A36 , IS 2062 normal structural steel