Drive Definition and 496 Threads

Dawn spacecraft is nearing Vesta and is planned to go into orbit 16 July. http://science.nasa.gov/science-news/science-at-nasa/2011/06jul_vestamoon/ The craft will orbit Vesta for several months and then move on to another asteroid, Ceres. The NASA press release mentions that several...

Dear all, I was reading about the Alcubierre drive, and although there's the more recent issue with Hawking radiation potentially frying everything within the warp field that's generated, I was wondering whether there had been any thought given to the possibility of the drive being flung parsecs...

I’ve been searching high and low for an answer to this question. What actually HAPPENS if two engines were to power one drive shaft? I heard back in the days that cars were built this way to break speed records, and I heard present day it is used in tractors, but what increase. My question...

When talking about amplifiers or voltage converters, what is meant by direct drive? The only idea I have is that it does not involve a transformer.

I'd be interested in some input on a question asked by a friend. Suppose you are a golf pro & train harder ( weight-training ) & increase your maximum driving ability from 300 yards to 310 yard with same accuracy. What theoretical advantage is this likely to offer you on the course ...

i want to know how to calcuate Starting and running for motor in 2 post lift for lifting 3.0T. Actually i have 2 columns having trapezoidal screw rod and nut in each side. One column is getting drive by motor through pulley belt mechanism. Another shaft is getting driven by chain at the...

So I have a chain driven system on a tricycle that I am kind of stuck with. the center distance of the two sprockets is 65 inches, and the chain is a 530 series, which has a pitch of 5/8. Now I have seen some sources reference or mention a 60 to 80 maximum of center distance to pitch ratio...

Hi I have a question, how does inflation drive omega close to 1? I heard Alan Guth say that inflation drives omega close to 1, how is that so? I hope I can get an answer for this question, I've been looking for it for quite a while.

Homework Statement A computer disk drive is turned on starting from rest and has constant angular acceleration. If it took 0.640s for the drive to make its second complete revolution, how long did it take to make the first complete revolution? Homework Equations...

Hello, I am seeking assistance with a design project for my engineering design class. We are tasked with developing an educational toy and then assembling a working prototype. Our group decided to develop a small scale electromagnetic roller coaster (Yes we are quite ambitious for a group of...

Homework Statement A computer hard drive disk with a diameter of 3.5 inches rotates at 7200 rpm. The “read head” is positioned exactly halfway from the axis of rotation to the outer edge of the disk. What is the tangential speed in m/s of a point on the disk under the read head...

Mechanic of Machine -- belt drive system Homework Statement An induction motor shaft, runnnig at 1200 rpm, drives a workshop main shaft by a flat belt drive. the diamter of the pulley on the motor shaft is 40cm n the main shaft is 70cm. another pully of diameter 45cm drives a countershaft...

Lately I have had an idea for a propulsion system. It would use rapid high voltage electrical discharges to create thrust. Now if it was strong enough and made correctly could this be an efficient form of thrust? Would it work?

If the warp drive is shut down either by its destruction or just plain turning it off, what happens? Does the vessel stop? Continue coasting forward? If so how would the time dilation factor at speeds several thousand times the speed of light?

I see a hard disk drive (Q:) in my Computer directory but I don't know what it is. I recently reinstalled Windows and everything is fine except for this. I can't access it, it doesn't appear in Disk Management (when I right-click my computer icon and click Manage). Here's a screenshot of what...

I didn't really know where to put this. So a few months ago I was reading about the Alcubierre Drive and became fascinated with the prospects of this theory. However I was disheartened that so many felt it was unattainable due to the need for exotic matter. Recently I came across this...

Hello everyone, In COPD tell me what I'm thinking is right or wrong. 1. O2 decreases and CO2 increases 2.Central chemoreceptors cause hyperventilation 3. Overtime this is not good enough and CO2 increase, and central chemoreceptors become less sensitive. 4. Peripheral chemoreceptors...

Hello All I am trying to work through a belt drive design and I am confused with a simple concept. I have a two stage system that has a max torque input of 110N. I want to treat this as "worst case", so I assume that all of the torque is used at the final output flywheel. The first...

I turned on my computer this morning and it said my computer couldn't start and it began a startup repair thing. The startup repair thing didn't find any problems and it shut down my computer. I turned my computer back on and it started up normally. Is this an indication my hard drive is...

Attached is the Flexiforce drive circuit. I would like to ask whether I can improve improve the performance of Flexiforce in term of linearity, hysteresis, repeatability, or whatsoever other parameter by change the drive circuit to Wheatstone bridge or instrumentation amplifier?

A car drives over the top of a hill that has a radius of 50m. What maximum speed can teh car have without flying off the road at the top fo the hill? Soooo I know I'm supposed to treat the hill like a circle...no coefficient of friction given, not sure if I need that though, not really sure...

Help required in order to determine required horsepower to rotate a steel hollow cylinde containing approx. 0.75 tons raw compost. the cyl. o/d is 1.8m., length is 2.8m. The cyl. is rotated about a central axis which is a 3inch o/d steel tube supported on 2 plumber block bearings.The cyl. req.s...

I'm calculating a hypothetical flywheel/IVT/reducer/vehicle scenerio where a flywheel with a moment of inertia of 312 ft2*lb and ang. velocity of 10,000 rpm is connected to 30-in dia. driving tire of a vehicle. The vehicle is 2000 lbs. The flywheel will accelerate the vehicle 0-60 mph in 10...

So it seems they have 16 GB devices. So that's 16 billion bytes probably on some storage element no bigger than a postage stamp and very thin. So that's what 128 billion bits? So does that mean we have a single memory device, postage-stamp size, with 128 billion transistors? How exactly is...

How would a warp drive work, and it is also that it would need tremondous power to operate, how much power, and what kind of power?

Hey, guys, do you have the experience of running your daily used apps off a USB drive? Which is I am now trying to do. But I find that only portable apps can be run like that. while some apps like MS office are not portably available. How can I do that?

Does a hard drive weigh more when data is stored in it?

I don't want to "pirate" any movies, but would like to rip DVD's that I bought into my computer so I can put them on my iPod. Are there ways to rip copy protected DVD's with many chapters/episodes etc? Which software allows me to do it? Is it legal?

Hey guys, I working on a bearing design project for a mech. design class. The bearings will be used to support an automotive drive shaft, and I was wondering: 1) if there were any axial (thrust) forces introduced to the shaft by the engine and whether they are negligible or not 2) if...

I understand the general aspects of how a hard disk drives works. I have gone deeper and have learned about the various types of magnetoresistance, both AMR and GMR. I understand the fundamentals of how these systems work compared to older units. But people keep telling me that the data...

First of all this is not a perpetual motion machine. This type of transit drive works in theory by having two combustion chambers positioned parallel to the spacecraft 's width and perpendicular to its length. Each of the two exhaust nozzles are also positioned parallel to the spacecraft 's...

I can't exess files from my specfic login only the public files e.g. files that were on my desktop. Any ideas? Cheers

Homework Statement Calculate the motor size required to drive shaft A. (shown in schematic 1 diagram) Drive shaft rotates at 75 Rpm. Weight of plunger + attachments = 30kg's Dimensions of plunger given in schematic 2. Homework Equations Work done = F x d (distance...

I am working on a vehicle based computer game. The focus right now is to get the internal physics of each drive line component as physically correct as possible. Since a few weeks, I am stuck with a problem that I cannot get past by myself. I have narrowed it down to a specific issue. It should...

There are a couple of products on the market which allow you to attach an external desktop gpu to the laptop and then use an external monitor and play games using the the desktop gpu instead of the weaker gpu in the laptop. It's a great idea but it means that you must carry an external...

I have 4 p.c.s with SeaGate Barracuda ST3250310AS 250 GB Hard Disks installed in them . These pc.s have 2.7GHz AMD Athalon 64 X2 CPUs & Asus M2N68-AM SE2 Mobos . There is 2 GB DDR2 RAM installed in each of these machines (not dual-channeled) . They also have XFX GeForce 8400GS Cards . However...

So, if i use this ready boost feature, will i be able to pull my drive otu when I'm done without it have any random crap on it?

I looking for help on a problem I am trying to solve here at work. I am not an ME, so my mechanics knowledge is low. This isn't helped by the fact that my mechanics class was 13 years ago. I have a label applicator that is not geared correctly, so it runs slower than the wrapper that it is...

Energy is needed to "drive" an ecosystem Energy is needed to "drive" an ecosystem. What is the fundamental source of that energy? A. Chemical Bonds B. Heat C. Organic Fuel D. Sunlight I am not sure about this question but I think the answer is D. Sunlight is this correct? And if so why ?

Hi all. I don't know if I have posted this in the right section, but I am hoping someone might be able to lend me a hand with a project. A friend on mine and I are always looking to build something challenging and unique. We recently finished building a truck completely from the ground up...

I am trying to lift a load with a drill motor. I have a chain drive with a 3.7x1 ratio - 13 teeth on the drive gear with a 2.5" diameter and 48 teeth on the driven gear with a 7.75" diameter. It lifts the load easily. I also have a geared drive (no chain) with a 4.0x1 ratio - 16 teeth on...

I just registered for this forum as I have a problem that needs solved. I am building an industrial museum in Youngstown, Ohio, and the centerpiece of our collection is a 230 ton stationary steam engine which we saved from a local steel mill. I am designing an electric drive for it so that we...

A recent paper says that Alcubierre's warp drive probably won't work due to quantum effects: http://www.technologyreview.com/blog/arxiv/23292/ -- nontechnical summary http://arxiv.org/abs/0904.0141 -- paper Speaking as a non-specialist, it seems hard to tell which predictions about the...

I recently installed a new hard drive as my old one was damaged. I couldn't retrieve anything from my old hard drive so I had lost some items of software (for example, I had to buy a new webcam as I no longer had the driver for my old one). However, for some reason my speakers do not work with...

I am interested in learning more about the Alcubierre warp drive. Although I've read every qualitative description imaginable plus Lillian Lieber's The Einstein Theory of Relativity, which gives a BRIEF introduction to the math behind GR, I am totally lost when it comes to the math. Although I...

My wife's computer hard drive failed the other day. She backed up her data, but on a partition on the same drive. The failure was mechanical, the spindle motor froze up. So accessing the backup partition was also out of the question. I was afraid we were doomed, but I read about people who...

Apparently Tiger Woods is interested in the LHC. Perhaps he thinks it will help him in his game.http://blog.taragana.com/sports/2009/12/05/tiger-woods-drives-physics-books-sales-sky-high-53288/"

Dear guys I need assistance regarding optimization problem. I have to minimize the power loss in worm gear drive system. I have formulated minimization function,and constraints,how to solve the function and find design vectors. ANy suggestions,sites,ref.welcome Thank u Prakash

Can anybody help me with these forces, I appreciate the effort. The roller shown sitting on top of the circle which is the bictcle tire is spinning counterclockwise imparting a tangential force on the bicycle wheel. Is the roller creating the force to drive the wheel forward, or is the entire...

My 1 TB external hard drive which currently houses about 850 gbs worth of media is having an issue. It won't display in my computer but it displays in disk management in black as 931 gb of unalloacted space. When I right click I can't assign it to a drive letter. When disk management pops...