Drive Definition and 516 Threads

Hello Friends, I have been wondering, is it possible to construct a motor, and attach a coil to it, such that with the motion due to the rotation of the motor, it generates a excess of energy that can be used to power the motor in turn, basically, could i use the excess to charge a battery that...

[Moderator note: This thread was moved from a HW forum. Hence the template. But it doesn't sound like homework.] 1. Homework Statement What will happen if i disconnect driveshaft from transmission and rev engine in drive? Homework Equations Rear end speed sensor could be play some role in...

Russia has developed a micronized nuclear powered drive for ballistic misiles and cruize misiles. This is obviously a very aggressive and environment polluting action. However, could such nuclear powered drive be used for space ships, that would start in space and do not touch the atmosphere of...

Homework Statement A man drives a car starting 5.00 km due West from the line marking the Eastern time zone. He travels at 30 m/s along a straight road that runs in a direction E 30° N. How much time does it take the man to get to the Eastern time zone? (The man must travel along the road: no...

I saw a conference from a Ligo physicist she said they are detecting gravitation wave of collapsing star. I also read the Doppler effect is working on gravity due to limited speed (c). I want to know if it is possible to detect a big mass traveling close to the speed of light in ours frame of...

Hi there! I am currently making a design about drive systems used for micro-hydro scheme. I don't know what type of driving element is suitable to used for transmitting the power from a turbine (cross flow turbine) to a generator. I'm planning to use both chain and sprocket & V-Belt Pulley which...

https://www.ncbi.nlm.nih.gov/m/pubmed/22552705/ Replicating past findings, no significant correlations between T and desire in men were apparent, but these analyses showed that the null association remained even when psychological and confound variables were controlled. Men showed higher desire...

I have acquired an old 1.5kW/2HP VFD [1] with aim to power a drill (which I don't have yet) with a three-phase motor from the single-phase outlet in my garage. It was supposed to be in working order, but alas it was not as the LCD display, for one, is only displaying gibberish (yes, I have...

Wondering if anyone knows anything about this. It was mentioned to me in passing. That on QNX, with an ETFS file system when you append to a file, that it completely rewrites that entire file to another location on the Drive. This presenting an issue with extra NAND flash writes ultimately...

I'm trying to understand calculation made Robert Zubrin in his presentation on Dipole Drive source: In here he made the following statement "A Coulomb of protons has a mass of 0.011 milligrams. If the jet power is 400 W, and the potential difference is 64 V, so the proton current will be...

It seems to me that if one had a functional Alcubierre drive and used it there would be some subluminal frame of reference in which time was going backwards for the spaceship which probably for it and for macroscopic objects in it which constitute a reasonably closed system would be a violation...

Hi I'm trying to connect two fly wheels together which are elevated on a bar and about 12 feet apart, the one wheel is driven by a motor and I would like the second wheel to be synchronised in rotation with it. Belts and/or chains are the obvious way forward but would it be difficult to connect...

I was reading this article about a possible warp drive that seems like science fantasy to me. https://www.universetoday.com/89074/what-is-the-alcubierre-warp-drive/

a belt is driven by a pulley at 33m/s the pulley rotates at 750 r/min. calculate: (a) the rotational frequency in r/s (b) the diameter of the drive pulley

Since it seems unlikely (to me) that current approaches will very rapidly stop the increase in CO2 levels driving climate change, alternative approaches involving removing CO2 from the atmosphere are being explored. Here is a link to a Science mag news article about using plantations to do...

If I need 50,000 Nm of torque to rotate a wheel, and I am rotating it about its rim (like the London eye), would 5 10,000 Nm motors each connected to a set of tyres to rotate it (the motors are not connected to each other), or would these motors first need to be connected to each other and then...

I was watching an excellent presentation of the theory of the Alcubierre warp given by Miguel Alcubierre himself at the 2017 Starship Congress (link below). At the 43:55 mark Alcubierre explains that the negative energy is located around the circumference of the craft in a toroid. I always...

Today for the first time in my Google Drive there appear several files in "quick access" labeled "you downloaded this month" although I did not explicitly download them, but were perhaps downloaded as part of a java script running somewhere on my computer, or maybe they are malware, that is the...

Hi folks, I'm currently working on the design of a triplex plunger pump. I have conducted an investigation into the loading of the pump at maximum operating pressure using an analytical method (free body diagrams) and using rigid body dynamics to validate. In both analyses the pump has been...

Hello, I've been wondering about this... If something like the Alcubierre drive is possible, that bends spacetime around it in order to reach great distances faster, why would this not affect other matter in its vicinity? If I'm understanding correctly, in order to move faster than light, a big...

Question One What would be the effect on the following if the load torque is increased and the speed maintains constant (give reasons for your answer): A. the tension in the tight side of the belt B. the tension in the slack side of the belt C. the power transmitted. Not sure on how to solve...

We know that belt drives are limited in their max possible power rating and most high power/torque applications(trucks) use gear drives. I wanted to know the main factor that limits the power/torque rating of belts. Is it Frictional slip or Belt material? If the frictional slip could be...

Hi, I'm and uneducated garage tinkerer currently motorizing a motorcycle dolly in order to rotate a motorcycle 180 degrees within its length to enable me to ride off and upon returning to my garage, to rotate the bike in order to drive out on my next ride. My question is what amount of ft-lb or...

I have no idea where this belongs or if it will be deleted but would Alcubierre drive cause detectable gravitational waves? And since I'm heading out on this limb would the direction of propulsion be indiscernible? As per the Wikipedia description it follows from a solution to the same general...

In driven SHM, we ignore an entire section of the solution to the differential equation claiming that it disappears once the system reaches a steady state. Can someone elaborate on this?

Homework Statement Belt coefficient of friction is .35, pulley diameter is 100cm and maximum torque is 200nm. Calculate the force on the tight side Homework Equations T2=T1/e^friction*angle The Attempt at a Solution T=fr, 200nm=f x .5m , f=400N T2=T1/e^friction*angle 400N=T1/e^.35*pie...

I am in a discussion with someone about the Alcubierre drive. I have doubts about it and he seems to think that Harold White experiments shows it can be built I am trying yo get an idea what current thought is on the drive. I know the drive does not violate general relativity but what about...

Hi all, Hope this is not too simple/dumb: When we save , say a Hard drive to a flash drive, are the saved files saved in the drive with a schema similar to the one that existed on the hard drive? Sorry I am being kind of lazy in not doing an experiment; thought someone may save me time...

http://constructionasphalt.tpub.com/TM-5-3895-374-24-1/css/TM-5-3895-374-24-1_666.htm consider the misalignment illustration in the link above. What makes a misaligned belt drive inefficient? I imagine it is due to increase friction but where does this friction manifest in the system? (which...

What is the situation for my hard drive now? Can I fix it with a software? Should I change it? The PC is working with no problem? What should I do now? Should I change the hard drive in the service? S.M.A.R.T status is bad. There was nothing a few days ago. I cannot understand how this has...

Long drive shaft of 5 inches fits into the end fitting and is rigidly attached by the bolts. Input torque is equal to output torque as we are ignoring losses from bearing. Let's assume that the load on the shaft is equal to 3*weight. (3 g's) (looking for more conceptual understanding rather...

What is innovation ? ... here is a great example. I'm in this field and know this product pretty well. I though it may be interesting to both the old and new PF members... http://www.controldesign.com/articles/2016/peter-hammond-recalls-the-birth-of-the-medium-voltage-drive/?show=all

If you were in a warp drive spaceship traveling at say 2c. Would all observers see your ship traveling at 2c?

I am a 66 y/o firefighter that competes in the Firefighter Combat Challenge. One of the evolutions requires the FF to use a Keiser Force Machine. This is a 160# beam on Teflon runners, 2 each 2" x 36", in a stainless still tray. Using a 9# shot hammer we have to drive the beam 5'. The problem...

Is that "normal" for a machine running Windows 10? I have a 120GB hard drive and 55.2GB is being used for System & Reserved. Seems high.

I have Ettus B210 and trying to add 1 line configuration file "/etc/security/limits.conf" which will allow UHD drive to set priority. So , I typed this command to edit file: gksudo gedit /etc/security/limits.conf and add: #@student hard nproc 20 #@faculty soft...

I just had this thought while watching a video about the EM drive...basically using 2 lasers to bounce them off prisms inside an object to push the craft through space at a small but constant acceleration...could someone explain why this would not work?...please see attached image :)

Homework Statement I have a task right now that requires me to calculate the energy savings that would be made by using a variable speed drive. Question: The factory process water distribution system consists of a 150mm cast iron ring main at a pressure of 5 bar (50m). The local water is...

Hello fellow physics friends (alliteration: always a strong opener). I am writing today because I find myself struggling to complete something which ostensibly doesn't seem that difficult to the average physics undergrad working in a lab. However, electronics and circuits are definitely a...

Since NASA is currently under way with the deep space Ion drive, they plan on using xenon to power this propulsion system. My question is could they harness the already existing radioactive particles in space to power it? If they could then there would be almost an unlimited supply of fuel for...

So say I smash a glass plate on a chess board much larger than the plate. Simplistically, say entropy is the number of ways of rearranging the glass pieces across the squares of the board. Over time, it's likely that entropy increases since the glass would spread out, meaning each configuration...

Greetings. How would I go about finding a way to use an audio signals frequencies to control the positive connection on a 12v dc led circuit? In other words, have the visual effects you get hooking up a dc led strip to an amplifier, but instead controlling the dc positive output to the strip...

Given that 1.34Tbit of information can fit on a square inch of average hard drive surface, how many 400 KB files could be written on a square millimeter? I did the math and came up with about 634. This seems unbelievably high and I wonder if someone would have time to check it. I kind of need...

A common sense questions. Can anyone care to provide their insights?

I notice there has not been a post about the EM Drive on the website in quite some time! This surprises me considering it is such a widely discussed issue in the general public. With the recent peer-reviewed publication about the device, I thought there would be a lot more discussion aboutut it...

There has been a lot of controversy surrounding the EmDrive and it supposedly being a reaction-less drive Many have pointed out that this goes against the conservation of momentum I have seen videos of a couple people dismissing the notion and outlining the apparent issues with the physics I am...

My senior design adviser told me that the VFD must be the same brand as the motor that is being used, I'm not sure I believe this. I plan on using a GS1 series AC drive, here is a link; https://www.automationdirect.com/adc/Overview/Catalog/Drives/GS1_(120_-z-_230_VAC_V-z-Hz_Control) Here is a...

What HP of DC Motor is required to run a 2.5 KW DC Shunt Generator?

One of the enemies of SGI is the Ori, how does their black hole drive work?