Engineering

Does anyone know how they REALLY built those things? Human Labor? Aliens? I've always wanted to know, but i cant find any type of references....

Read about here http://www.inews880.com/Channels/Reg/CyberCorner/Story.aspx?ID=1660595 I have 3 questions 1.How will space mining be profitable when going into space is so costly ? 2. Putting people or payload in space is extremely costly 3.How are they going to get in space go to China or Russia? ( NASA does not put people or payload in space any more ).

does anyone know (or have an educated guess) what frequency electric shock pens operate at?

Recently, I have been coming across the news on BLE/ BT 4.0 on "Home Automation". However, I would like someone to clear my queries (my knowledge in electronics/ networking is limited) 1. Cost of BLE vs Zigbee vs Z-wave technology? 2. Can devices with older Bluetooth versions (BT 2.0 or BT 2.1 or BT 3.0) communicate with a device (say iPhone 4S) installed with BT 4.0 technology? 3. I read, that the range of Class-I BT compatible device is 100m and the range of Class-II BT compatible device is 10 m. So, if both the devices are placed 90 m apart, can both the devices communicate now via BT (since the Class-I device doesn't fall within the range of Class-II BT signals)…

Hello everybody. I am facing a difficulty at this point of my life, and this place crossed my mind as a proper one to seek answers for my questions since it has all the experts Ever since I was a little girl I loved mathematics and it has been my favorite subject ever since and so I’ve always wanted unquestionably to become an architectural engineer because I believed it is the most filed in engineering which requires understanding in mathematics. A couple of months ago I discovered that it doesn’t (too late and stupid eh?), some of the courses in college may need some understanding in math but generally it doesn’t, and after graduating and having a job as an arc…

I am a 4th Year geology doing analogue experiments of 'Crystals' Falling through Newtonian Fluid-fluid interface (Golden Syrup and Sunflower Oil). The Crystals are of Different Aspect rations and pass through a fluid-fluid interface. I need to describe my system mathematically, using dimensionless numbers, bond Number, Reynolds number ect. This is so I can scale my project to wider work in understanding magma chambers. What else do I need to consider when describing a settling particle (especially one using cylinders instead of spheres). 1) What do I need to consider when Describing Mathematically a settling particle through a fluid-fluid interface, What other dimensi…

Greetings! I have been curious ,ever since I began researching for my particle accelerator power source, about magnetic generators. I have seen many demonstrations on Youtube of people's projects, etc. but there are many comments regarding these as perpetual motion-esque failures for violating the Laws of Thermodynamics. So, is a magnetic generator a plausible solution to our energy crisis, and is it a perfectible science regarding degrees of magnets, etc.? I ask the latter because you can support Perpetual Motion by saying that it requires very, very, very precise angles, and so on. I have begun to construct a magnetic generator using 2 CD-Roms as the plate to be rotated…

Hi guys, I'm writing a lab report on fatigue testing and have been asked to discuss methods of predicting fatigue failure. After researching this I came across a method called E-N curves, which we haven't covered in our class (we're using S-N curves) so I was wondering if anyone can explain E-N curves to me simply? Thanks!

http://www.popsci.com/diy/article/2011-03/video-diy-scanning-electron-microscope I know nothing about electron microscopes, but I would seriously love to have one. If this has any validity to it, I know I could build one that is much more impressive, because I am just that awesome. j/k In all seriousness though, budget electron microscopy is something that could accelerate many industries forward and I hope there is more truth behind this than fiction.

Hello Science Forums, I have a car travelling a certain velocity and absorbs x Joule of Kinetic energy on impact. I don't have the time duration of impact. I need to calculate the force at which the car made the impact. Can someone suggest me on how to find the force? Regards

I have a liquid mixture of glycerol (GLY), water (H2O) and tetrahydrofuran (THF) solvent. The weight fractions are about 66.41% : 21.88% : 11.71% of GLY : H2O : THF. What distillation methods are best to separate these liquids into their pure components. I would like GLY to be >99% wt. pure. The H2O and THF each can be > 95% wt% pure. Would simple distillation work?

Hi everyone pls help me with this... How does a magnetic compass works..? added, is it pointing to geographic or magnetic poles of earth.

My knowledge in electronics is limited. In general, the television remote use IR for sending signals. I would like to know if the same signals can be transmitted using bluetooth. If so are there any disadvantages in using bluetooth technology in television remote? Regards

I'm building something requiring a heating coil that hovers at 500-600F and quickly jumps to about double that, sustains the high temperature for 1-5 seconds, and then drops back down to the original temp. How do we get the temp to double extremely quickly? I'm thinking we just make the high voltage for a temperature that is WAY higher and it will reach the actual desired high temperature more quickly, but I don't know whether or not that will work.

I would like to see if it is possible to mix two signals with one transistor: I don't have equipment to test it but would like to know at least theoretically what could I expect: I want to mix two signals and get some kind of mixed output, it doesn't matter how they are combined, just a random mix of the two signals. So I though about injecting a signal into the Collector, a different signal into the Emitter and see what could come out of the Base terminal: I expect a very weak signal obviously since I am using the transistor not really as an amplifier but as some kind of mixing signal system, but the weak signal should be some kind of mix between the two signals inje…

At work I started a course about vibration sensing but unfortunately the first half an hour i wasn't present. a question I was wondering about was ''why would you need to determine the vibrations in the conservation of Pre-Historic temples?'' I mean, does vibration (even the slightest), affect building and/or artifacts in any way or another ? thanks.

I am trying to convert British Units into SI units for a heat transfer coefficient. My worry is the time in the british units (BTU/hft^2 -F-). The SI unit for heat of transfer does not have any time in it (W/m^2k). I tried converting W into Nm and then N into Kgm/s^2 and we are left with (Kg/s^2 -k-) but this does not relate to BTU in British units. If someone can show me how to get time into the SI units or tell me that it is not relevant I would appreciate it.

hi, i'm trying to build something electronic but, unfortunately, my knowledge of electronics is naff and i am getting incredibly blagged and confused trying to figure out how to do this on the internet. what i am attempting to do is create a circuit which converts a 4.5v DC power supply to a 50Hz 39v AC power supply. if you could provide simple instructions on how to achieve this i would be most grateful. (by simple i mean the names and specifications of the components i need and how to connect them. nothing more, nothing less, otherwise i will get confused xD) your help would be much appreciated, thanks.

As the title suggests; would rear wheel steering (in a car) make cornering easier/safer/faster? This question is someting I've been pondering for a while. Having driven front wheel, rear wheel and 4x4 vehicles and sliding them around a bit on public roads for fun whilst no-one's looking, I've often wondered how a car would behave if it were rear wheel steering. Presumably, having the rear wheels drive and steer the car would result in a little over-steer, rather like the effect you get when performing a J-turn in a front wheel drive car. A front wheel drive with rear wheel steer might behave more like a boat or aeroplane with it's rudder turned hard a-port/starboar…

I am Designing my own car and am trying to make it a rear motor design, anyone know about clear schematics, or videos about the motor, drive train, tansaxel set-up? I looked around on the internet but couldn't find any. Anything Would Help! Thanks!

I am making a game, and one of the things involved is the city of Atlantis. As Atlantis is overused, I decided to make it different. So, in the game, Atlantis is a hovercraft city that flies around the Mediterranean. How much energy would it take for a modern-type city of about 3 mi diameter to fly about 50 feet above the sea level? Using, say, a Hydrogen power plant. Assuming it is made of an incredibly light material and is about 100 feet tall. Also, if it sank, how much water would it displace? I need to know that so I can remap the Mediterranean sea for an area with much less water.

Hi there, i'm new to these forums and i'm in need of some help regarding magnets. I'm working on a project with the saddlebags on my motorcycle and i have created a separate partition inside the first one before moving on to the second. What i want to to is, if possible, have the partition held shut/closed by a regular magnet being attracted to an electromagnet that's NOT turned on. The idea i have is that when i run power to the electromagnet, it'll repel the regular magnet and open the compartment and when i cut the power off then the regular magnet will be able to be attracted to the electromagnet once again and close the compartment. Is this possible and could so…

All the vehicles (4 wheelers and sometimes 2 wheelers) in the market today possess various engine maps in the vehicle's ECU. There a number of maps related to vehicle top speed. However, all the data in the vehicle's ECU is not rewritable (not sure about this info). Can any one confirm me this info? Also, if I want to redefine the vehicle's top speed at the push of a button is it possible to perform this function? I hope my question is bit clear. Regards.

I'm attempting to extract some additional heat from an existing fireplace and wondering if anyone can help me with the rate of heat transfer from air through a copper pipe to water. Here's what I have....a fireplace with two chambers outside of the firebox where air can be blown to other rooms via duct work. Rather than blowing air, I'd like to install a copper coil of 1/2" flexible copper tubing and heat water to pump through my in floor tubing in the basement. The question is, if I have 40' of 1/2" copper tubing in the chamber with water flowing through it at a rate of 1-3 gallons per minute (if I set my pump on low speed and only open 1 of 4 loops in the floor …

Hi, Forums. I'm a 3rd year student in Bachelor of Computer Science. I have some queries and would much appreciate if you could help answering them. 1. What are the available Master degrees in Engineering to BCS students? 2. Is Information Systems/Technology Security Engineering accepted as an engineering field? Would the student who finishes the course in the Master Degree be professionally accepted as an Engineer? Thanks, any advice or comment is much appreciated.