Fuel Definition and 580 Threads

Homework Statement The electric power generated by a single average size nuclear reactor block is between 400 and 800 MW. The fission of one 235U nucleus generates 185 MeV energy on average. What is the total mass of the fuel rods loaded into a 760 MW reactor for a one year period, if the...

Hi everyone, I hope I have posted in the right place. I'm a commerce student and have absolutely no idea about mechanical stuffs. My father has an idea in mind which he would love to implement. He too is a commerce student. Hence, I need some help from you'll to see if this is really practical...

This was an idea I had when when learning about ramjets. I was wondering if you could use a specially designed rail gun to launch a probe or satelitte ,at a very high velocity vertically upwards and then when the object is decelarating at 9.8 m/s due to gravity use a small rocket propulsion...

What are the differences between the use of MOX fuel and "standard" fuel? I've seen mention of the MOX fuel in news reports as being significant, but I've failed to understand their point of mentioning the use of plutonium in the fuel. Are there safety issues? Are there proliferation...

1. The launch vehicle takes the moon orbiter to a circular orbit around the Earth at 300km altitude. The orbiter is to perform a Hohmann transfer to a Lunar orbit, entering into a circular lunar orbit at 50km altitude. The objective of the mission is to put a 200kg orbiter around the Moon. The...

Homework Statement We are given an amount perfume, that has an energy level amounting to 1200 joules. Using this as the fuel, i need to build a potato cannon. How can i build the cannon to maximize the distance the potato travels when shot with this amount of fuel? Homework Equations...

What is the correct way to put limitation on different aircraft flying conditions with respect to the cavitation point of view of the Fuel booster pump in the aircraft? The pump is immersed in the fuel and the fuel tank is vented to atmosphere(in atmospheric pressure, which will change with...

Please help me and calculate the amount of torque required to sustain a car ,3500 lb car medium wind drag. aproxamently 70 mph. I know without wind resistance you can not figure exact but a close estimate would be greatly appreciated. Im wanting to add a secondary mini diesel engine 662 cc...

Will switching to alloy wheels (typically 17% lighter than steel) noticibly improve fuel economy? It seems like we should be able to calculate a rough estimate if we had necessary data but i don't. Has anyone been there?

For weeks after the Chernobyl disaster, many tonnes worth of molten "lava-like" nuclear fuel inside Chernobyl's shattered reactor vault eventually cooled down and formed into a hardened substance similar to ceramic. When nuclear fuel overheats and melts, how long does it remain in it's...

Could one really big hydrogen fuel cell battery replace a nuclear reactor in providing power to millions of people? This may end up being a safer option for generating power.

What I mean by the title is, why isn't it more popular? (I know there DO exist some hydrogen powered cars.) To me it just makes sense to use hydrogen. It is very explosive and it's byproduct is water! The only draw back I can see is storing the gas in the vehicle to be used. Can anyone...

Saw this for sale at Best Buy: http://reviews.bestbuy.com/3545/9754101/fuel-doctor-fuel-efficiency-booster-gray-reviews/reviews.htm The claim is that via power conditioning, the device improves the accuracy of your car's sensors and other electronic devices, thereby improving the car's...

Hi all. I need help on an issue I can't figure out. What is the difference between 15x15 and 17x17 fuel when it comes to moderation properties? Standard fuel with these lattices have dimensions 15x15: pitch: 14.3 mm, d_rod: 10.77 mm 17x17: pitch: 12.6 mm, d_rod: 9.5 mm These geometries...

Hello and here is my problematic 1st post. I have a problem which i need help with, I'm an electrical engineer so my understanding on this subject is basic. I need to calculate the cooling effect of a AGR fuel pin and I'm not sure were to start. Here is some background on the question...

I am just a finance guy, but I've been reading up on the current crisis and found this blog. Anyone here thing this guy might actually be correct in his assumptions? http://atomicinsights.blogspot.com/2011/03/focus-on-food-water-shelter-dr-greg.html

Could anyone who actually works on this kind of thing answer a couple of questions about the current situation in Japans nuclear crisis : Is it true that cooling pools for spent fuel rods are stored on the rooves of these reactors ? If so we see two of these rooves have been blown off - so...

Homework Statement Why does a car uses more fuel with lesser air in tyres? Homework Equations Work done =F.d The Attempt at a Solution According to me Friction does no work in rolling if the tyre is purely circular. But when tyes are deflated then they are not circular. Due to...

If my car goes twice the distance on the same amount of fuel, doing twice the distance the friction and wind resistance is double. Can I say my engine uses fuel 4 times more efficiently? Or is it only double? My thinking behind it comes from Ohms law, if you double the voltage you get 4...

I've posted on here in relation to an aerospace analysis project I'm doing. I'm stuck on one part of the project where I need to develop the performance envelope of the turbojet engine. 3 of the 9 plots that are required are Thrust vs. Mach number. On each of those plots I'll about 7 different...

Do exist some proposed nuclear fuel cycle in which uranium or thorium whoud be first converted in some beta or alpha emitting isotope and after energy whould be harnessed with direct energy conversion methods?Possibly, it could reduce size of power plant and make steam turbine unnecessary.

A spacecraft ’s motors provide a total thrust of 1.5 MN. If the exhaust speed is 2.5 km/s, at what rate is fuel being used?Homework Statement Thrust = 1.5 MN Exhaust speed = 2.5 km/s rate fuel being used = ?

Hello, I am looking into ways to increase the fuel efficiency in a various number and type of ships, with engines running from diesels to steam plants to gas turbines. I was wondering where I might find information on the state of the art practices with propeller design. Specifically...

Hi, Could someone explain what is a motive flow in the aircraft fuel system? Thanks, Suresh

"A rule of thumb is that for every ten-percent increase in efficiency for rocket fuel, the payload of the rocket can double.” Can someone assist me with a simple formula to model this rule-of-thumb? What happens to the payload if the rocket fuel efficiency increases twenty to thirty percent?

Low Temperature Diesel Fuel (urgent) I'm having a problem with diesel fuel at the moment and would greatly appreciate insight into the subject. I'm currently stranded in Colorado where it's somewhere like -10 degrees (F) and our diesel truck isn't starting. I've narrowed down the problem to...

Homework Statement Hello, I am currently a gr 12 high school student, and I am stuck in a problem. Please help :) The problem: Consider the motion of a rocket near the surface of the Earth. In this case, mass, in the form of gas is expelled from the rocket to propel the rocket upwards. A...

if fuel coposition as follow : 75 wt% Tho2- 25 wt% uo2, were the U enrichment 19.5 w% ... how can i caculate the number density (Atoms/barn-cm) for the comopsition ?

Imagine this scenario: An "airplane" that runs on some type of fuel, let's say, liquid, reaches 90% of the speed of light. Once it achieves this speed, will the ship require less fuel due to time dilation, the same amount of fuel due to time dilation, or more fuel to maintain a constant...

1- i have a proplem to understand the meaning of the once & twice burned fuel, and why we use when we going to simulate the whole core 2- is there a specific formula for the IFBA radius,

Hello all - once again! I am an aspiring SF writer currently in the process of writing a book. I am looking for ideas (go nuts!) for different types of spaceship fuels. The idea is that the fuel has to be something that exists in abundance (preferably naturally occurring), and...

Homework Statement A rocket rises vertically, from rest, with an acceleration of 4.0 until it runs out of fuel at an altitude of 1500 . After this point, its acceleration is that of gravity, downward. How long does it take to reach this point? What maximum altitude does the rocket...

Basically as the title says, is it possible to build a DB fuel cell stack? Something that could output 100W (to power a laptop or for power outages). I actually have access to a couple of kilos of sodium borohydride and while looking at what I can do with the stuff I came across this type of...

Greetings everyone! Just a few weeks ago, I got it in my head that I'd like to determine some formulas for the efficiency of an engine - particularly mine, a 1991 Geo Metro. The overall goal is to compare various acceleration rates to show how slower acceleration can produce greater gas...

Homework Statement Finding the volume of a partially full cylindrical tank that lies on it's length. L=6', D=4" Homework Equations pi r sq times L = cu ft when full. Convert to gallons 1 gal. = .1336 cu. ft. (I think) The Attempt at a Solution (pi r sq times L)/2 =...

Investigate the potential for the use of a nuclear fuel source for aircraft propulsion: If anybody have related document and ideas please post it

I've been to Crappy Tire and I've been to Fogh Marine and I ;'ve looked online at Bass Pro. All they have are these new-fangled plastic fuel line/tank interlocks: http://imageserv8.team-logic.com/store-logic/products/5/8680/st_8776.jpg Mine looks like this...

Homework Statement Hello, This is not a home work question but as I am not a math or physics major I need some help moving this problem forward. I am trying to calculate how much fuel (petrol/diesel/LPG) it takes to accelerate a vehicle and well to cut a long story sort I seem to be...

Hello, I am trying to calculate how much fuel (petrol/diesel/LPG) it takes to accelerate a vehicle and well to cut a long story sort I seem to be getting my units mixed up also whether I should us small or big calories. Lastly is the incline and issue that I also need to consider and how do I...

A rocket is launched vertically upwards until it uses up its fuel. It then falls back to Earth. Find the time when the rocket uses up its fuel from the graph. My answer was 20s. Is it correct?

Could somebody expain me the following questions: 1)Why hydrogen fuel cell needs catalyst (such as platinum) to operate, while elcectrochemical elements (such as zinc-air) do not? 2)Why power density increase in fuel cells leads to efficiency decrease while in electrochemical batteries it...

when approaching C the mass of your craft increases. If the mass of your fuel increases also wouldn't that mean the faster you go the more fuel youll have?

hi, what is the exact best speed for fuel economy? why is 5mph less economic than 75mph?

Homework Statement Hey, just doing a few problems and i have found i have no understanding of how to solve these types of question, if anyone can help or provide info it would be great thanks... Q " The fuel oil supplied to a boiler contains 86% carbon and 14% hydrogen by mass. Determine...

Are there any possible performance gains or advantages in a rocket using a colloid as fuel propellant? If so, what might these be, and are there any examples of such rockets having been tried? Solid-fueled rockets are known to offer advantages in higher thrust, while liquid-fueled rockets...

The month long debacle over the BP oil spill, and earlier collapse of a coal mine killing scores of coal miners, makes me wonder: what are the risk to human safety and environmental impact for mining, processing nuclear fuel (i.e uranium, thorium) ? Could acquiring nuclear fuel lead to a...

How much fissile material, in kilograms, would, say, an Ohio-class submarine carry? If it's classified, what would be about a good estimate?

Is there a way to make the atoms in HHO gas (Browns gas) to separte into it's elements; so the Hydrogen atoms go one way and the Oxygen in another way. By doing this I'm hoping to generate electricity from the reaction by bringing them together again. What kind of fuelcell do I need?

Hi all, I recently made my own hydrogen fuel cell and really enjoyed the process and everything I learned. I didn't know much about electronics or cells, so it was a great learning experience. In my research I found that chemical engineers made a nanometal to work as a catalyst instead of the...

I understand that generating the hydrogen that powers a typical fuel cell is (prohibitively?) energy intensive at this point, but I was curious about the following: Assuming a sufficiently efficient catalyst was obtained that allowed large-scale production of pure hydrogen without...