Storage Definition and 258 Threads

Homework Statement An oak slab (ρ=545 kg/m3, k=0.17 W/(m-K), and c=2385 J/(kg-K)) of thickness 10 cm is exposed on one side to irradiation (1x10^5 W/m2) from a laser, which starts heating it up. Convection is negligible (i.e., h is small). The slab is initially at 23°C. (a) If the oak surface...

When I connect the phone to the computer via USB cable, it shows that the device is connected as a media device, and when I select for other USB options only Camera(PTP) is available. But I need it to connect as USB storage so I can test run app on my phone. I have tried turning the USB...

Neodymium magnets have an energy capacity of 512 kJ/m3 or 0,512 MJ / cubic liters. That's equivalent to 0.0085 kWh or 8.5 Wh each 1 dm^3. You could recharge an mp3 player for 34 hours, and then you'd have to throw away your magnet. That's still 468 times less than the capacity of a Lead-acid...

hey everyone. Merry Christmas. I am going to design a mechanical system, flywheel energy storage. The general idea is 'collect all the tidy rotational movement and release the power once reach certain torque level. This is quite similar to Self-retracting tape measurer or scroll spring toy...

Liquid Helium is a very small and electrically neutral element under high pressure; it will slowly slip through the molecular structure of any given container. Liquid Hydrogen is an extremely small element under high pressure, and it will also slowly escape any given container. A storage...

I need help as my 17 year old daughter is beating me. A few months ago my wife, daughter and started a competition to see who could get a book published first. My wife has her Master's in education and my daughter is a 4.0 AP high school senior. I have a BSBA from an online degree mill. So I...

Homework Statement The minimum storage capacity required to store the information in a digital radiographic exam that consists of a 1024 – 1024 matrix, 12 bit deep, acquired at 30 frames per second for 10 seconds is _____ megabytes. 1 37 600 695 2500 Homework Equations The...

Say you have a cylinder. The cylinder is 6 inches in diameter and 10 feet high. The cylinder has a floor at the bottom and is open at the top. The cylinder is full of water. How much pressure is exerted on the floor of the cylinder? Is it simply the weight of the water in the...

Keep your discovery programs to your selves, we are having to suffer things like, American chopper gold diggers, storage wars etc etc. Give us some educational programs please.

My answer is that the 3Gigabits of base 4 memory in the human genome is equivalent to 750MB of binary standardised to 8 bits/byte. Once I have taken into account that there are two copies, evolutionary junk and repeated or copied areas, I am getting an estimate of around 30MB.

Hi I was about to fall asleep last night and was thinking about breakdown voltage, when electrons are pulled from the surface of a conducting plate and form a channel that discharges a capacitor. This is called a vacuum arc, some other keywords are thermionic emission and work function...

Homework Statement 6. Based on what you can tell so far, if you have an N number of capacitors (say at a nuclear fission site) and you need massive power storage, you would place the N number of capacitors in a. Series b. Parallel c. Combination of series and parallel d. Both choices a and b...

I'm thinking of buying this nice DSO for under 1k $US for home use. It's the 70 MHz model in the Rigol DS2000 series. But that's not why I'm posting. I wanted to share these video reviews of the scope which are a real hoot -- provided you have spent a lot of your time using oscilloscopes...

So energy can only be converted... So when you squeeze the bulb on a blood pressure cuff, you are applying kinetic energy. Then the cuff fills with air and constricts the arm. Is the energy in the cuff then stored potential energy, or because it is actually applying the force to the arm, is it...

hi, for a task at school i have to design a pump and water storage system that will be able to work with a wind turbine to supply water from a well to a small community of about 2000 people. i am having some trouble finding information regarding these topics: -flow rate of pump -power of...

hi, for a task at school i have to design a pump and water storage system that will be able to work with a wind turbine to supply water from a well to a small community of about 2000 people. i am having some trouble finding information regarding these topics: -flow rate of pump -power of...

Greetings, I would like to use a synchrotron to store a stream of electrons. Usually, how long are electrons kept in synchrotrons, and how long can they be kept? I need to store them for a few hours. Thanks

I've heard fuel cells being called energy storage devices. However, unlike batteries, they only convert energy. They don't store anything unless you consider the brief moment of converting chemical energy to electrical energy storage time? Are there fuel cell types that store let's say hydrogen...

If I want to make a Square or Rectangle storage tank 5 feet deep and 22 feet long and 1 foot wide. The tank will be under 30 psi and also vacuum. That’s not hard to do what I want is the walls not to deflect more then .001 of an inch. The walls can be plastic, plywood with a steel sheet or...

I view energy storage as the biggest road block to implementing sustainable alternative energies. I want to see this happen, so I'm thinking energy storage is what I should go into. I view it as very versatile, and also as a growing industry. I also think there are inevitable...

Very strong magnets like neodymium can create a very powerful force! I wonder the amount of energy supplied when there created to be magnetized, in a sense don't they store energy and it is converted"demagnetized" over time? It came from the electricity used to create that magnetic field...

Electromagnetics -- parallel plate capacitor energy storage Homework Statement A parallel-plate capacitor 0.5m by 1.0m has a separation distance of 2cm and a voltage difference of 10V. Find the stored energy, assuming that ε=εo. If a 200-volt potential is applied in the capacitor, (a)...

Hi all, I am trying to model temperature variation with time of compressed air energy storage in a salt cavern. For now I have considered a spherical (hollow) cavern in which air is injected. I have to solve [U]{T}+[M]{T_dot}={Q} (here, Q is the first term and all other entries are zero)...

HI All!, I'm a thesis student in Industrial Design and need some physics help! My thesis project is to make a system that stores energy in the form of kinetic energy in a flywheel to power common products. This system would be plugged in all the time and would begin working immediately after...

Hi, My teacher gave me the following information and asked me to prove that 1 minute of music requires 10 MB of storage space in a CD. Sampling Rate: 44.1 kHz Bit Depth: 16 bits No. Channels: 2 I am a bit confused. If the bit depth is 16, that means I have 4 bits. But I only get the...

a UK company got $10M to build it, see here http://www.greentechmedia.com/articles/read/liquid-air-for-utility-scale-energy-storage/ . Can this be at least hypothetically feasible or is it more like pure quackery for stupid investors? ETA: to clarify, I don't doubt that it would "work" the same...

hi all, i want to know that how can i determine the size generator fuel storage tank. let suppose i have 3 generator and which capacity have 635kVA, 1250kVA and 700kVA... and this generator will be operate 85%... so its sum of kVA is 2585kVA and its 85% is 2197kVA and in kW is 1758kW. Now i...

How accurate are the muon velocity measurements in storage rings, for muons generated in hadron colliders like CERN. How is the velocity measured? For example, Bailey et. al. confirmed SR mathematical predictions in their famous muon ring experiment (1977), which lists the velocity of muons as...

Hi everybody. I have been thinking about this a while and could not come up with anything. I was wondering if there any chemical energy storage method that would have these properties: 1) it would be easy to produce 2) it would be easy to extract energy from 3) it would not have any carbon...

I am presenting here my vision for a large pumped storage hydroelectric 2-square kilometres surface-area reservoir and 300+ metre tall dam which I have designed for the Coire Glas site, Scotland. (View site using Google Earth where the convenient label is "Loch a' Choire Ghlais" - or...

Hello! I'm just asking for a clue on how to make a unit hydrograph Reservoir Level - Storage Curve for a Dam. I have been searching information on internet, but I could not find anything about that. I would appreciate any idea or suggestion. Thanks!

Greetings: I am currently in the research phase of a project. I would like to get some feedback, opinions, and supporting data/information concerning the feasibility of a small volume (less than 1 cubic meter) plasma container device that would ideally be used to store energy up to 100...

I have a laptop and I'm running Windows 7. I recently downloaded AutoCAD and some other CAD software and I needed extra storage space on my laptop, so I bought an external hard drive. I was wondering if there was any way I could reinstall any programs onto the external HD to clear up some...

Hi all - this is my first post. I have two questions if anyone knows the answer or how to go about finding out. 1. Considering the design of an icebox or cooler, would sandstone (talc) be a better storage medium for coldness than ice? I did some research and found that the volumetric heat...

Hi all, As part of my Final Year Project I am studying the feasibility of domestic seasonal thermal storage in water tanks. I am hoping to model this system and have been looking at the TRNSYS software for doing so. I know that this is possible to do because I have seen a number of studies in...

hi all, Is that skyline storage,which is been widely used in FEM problems, is only for symetric matrices? What if I have non-standardized matrices, that is , which can not be made symettric, has pretty randomly oriented inner products, which can not be put into any computerized manner for...

Hello, I thought of asking would someone know what is the correct thinking here... A body is thrown upwards, its kinetic energy gradually transforms into gravitational potential energy until it is entirely absorbed. At this moment, where is the potential energy? According to wikipedia (N...

I am trying to figure out what the actual efficiency of solid state hydrogen storage is. So how many kg of hydrogen can you store in a Xcm3 of metal hybride solid state storage. I was trying to find a conversion and only found a metric that was 500NL in a specific device that had some...

As part of my Intel Science Fair project "How to make Hydrogen a viable alliterative" I read that at 3,500,000 psi Hydrogen will become a "Solid" so that you can have more power in less space which will make the car much more efficient. I am doing this on a 1/10 scale. My question is what...

There is patent which describes new type of something similar to capacitor based on quantum effects. http://www.patentstorm.us/patents/6501093/description.html" Do you think it has any really working ideas?

Homework Statement An office furniture manufacturer that makes modular storage files offers its customers two choices for the base and four choices for the top, and the modular storage files come in five different heights. The customer may choose any combination of the five different-sized...

How much data could be theoretically and realistically stored in a hypothetical system consisting of a delay line loopback in the form of a long looped fiber optic cable?

I was pondering our reliance on and the limitations of todays electrical batteries. It seems to me (uneducated member of the public) that while technology continues to develop with an impressive momentum our energy storage methods struggle to fuel these ever evolving technologies effectively...

Metalloids such as silicon share similar properties to metals, yet the way that electrons are held in both materials are completely different. Whereas the electrons from silicon atoms are orbiting the nucleus, the outer shell of the electrons of metallic atoms are "stripped" from the atom...

Homework Statement Pumped Energy Storage. A water reservoir has surface area A and depth D. The water flows down pipes and through turbines to generate electric power. The bottom of the reservoir is at height H above the turbines. The depth D of water in the reservoir decreases at a rate δ...

Hello all. I was hoping someone could help me. I am building a storage loft in my garage. The issue that one side is drywall and metal studs. I was thinking that I would attach joist hangers to the concrete wall, then another set into the drywall wall but I wanted to know if the joist hangers...

My colleague and I have a disagreement about the storage of electrical energy using capacitors in DC circuitry. It all has to do with the equation for the capacitive energy storage, namely the energy stored in a capacitor with capacitance C charged from a power supply at some constant potential...

Sir/Madam, what is out put of glucose+water?is it possion? can i store this in packets? how long? if i combine "water+glucose+citric acid+carbon dioxide" what's the output? which taste i get?

I have a 10,000L water tank (size 3.5m Dia x 1.0 m H) connected to 2 inch pipe (bottom of the tank). How do I calculate the speed/volume of the water flow out from the tank?

Force in water storage, please help! [PLAIN]http://img13.imageshack.us/i/storageo.jpg/Hey! I am dealing with a an old construction/physics assignment and really need some help. The assignment is as follows: To make sure that a waterstorage is not flooded, one of the walls have a...