Probe Definition and 155 Threads

Will we ever be able to actually send a probe to the Earth's core?

The probe passes over an atom that is 3.20×10^2 nm "tall." The probe passes over an atom that is 3.20×10^2 nm "tall." By what factor does the tunneling current increase?

How on Earth do 'they' get a probe that close to a sample in SPM without it touching (in STM) or at just the right controlled amount?

how does contact resistance and sprearding resistance gets in eliminated in four probe technique for measuring resistivity in comparison to two probe technique where we encounter these resistances?

Homework Statement A very long insulating cylinder of charge of radius 2.70cm carries a uniform linear density of 16.0 nC/m Question: If you put one probe of a voltmeter at the surface, how far from the surface must the other probe be placed so that the voltmeter reads 195 ? Relevant...

“Teaching aids” The moderators and Gurus might want some recent “teaching aids”. Perhaps you will want to put some of these into a "sticky" The CERN site is producing some very good “teaching aids”. If you can, look at the ppt presentation, since it has animations. There are 3 pdf files at...

Should we send an interstellar (unmanned) probe to Alpha Centauri? Would it be much more expensive than a manned mission to Mars? According to Wikipedia, velocities as high as 0.10c are possible with hydrogen bombs. That means that ~40 years flight time to the nearest star would be possible...

Why is a space probe spinning around its own axes, when flying through space?

Hi, I am new to four point probe measurements and I have a question. I've deposited 500 nm of Ni on glass substrate to check out the equipment we bought. When I measured its sheet resistance the display showed 13.56 mohm/sqare for 5 mA current. To check out the measurement I multiplied...

Am I right in assuming that Gravity Probe B has proved that the rotation of the Earth (@~465metres /sec.) 'swirls' space-time in the same sort of way that a rotating ball will swirl a fluid? I ask because if this is the case, then the forward motion of the Earth (@~360km/sec.) must also...

Homework Statement Here's the question: http://www.phys.washington.edu/users/schick/322A/322-08ps1.pdf It's problem #2 The Attempt at a Solution Alright, so I got together with a friend and we did the following: I = V/R. For the x-direction flow, we know V and R, so we got...

I am building an automatic acid-base titrator for my senior project. I am using a Freescale s12ub microcontroller. For this project, I will need to interface a pH probe with the CMOS input on a microcontroller. The potential across the probe is supposedly proportional to pH. (-0.06 volt/pH...

Hi, I need help for 3 questions 1) Describe qualitatively the procedure for calibrating the force probe. 2) when determining the acceleration over a timeinterval, LoggerPro provides the following statistics : Average 0.107 Standard Deviation 0.120 Number of Points 54...

Hey, Sorry this is probably in the wrong section but I couldn't think of a more appropriate one. Anyway, I've spent ages on the net looking for a really simple hall probe - like one which I used back in school measuring a max of upto 1.5 - 2 tesla, and I just cannot seem to find any school...

Homework Statement Planet Zero has a mass of 4.0*10^23 kg and a radius of 2.0*10^6 m . With what kinetic energy should a 10-kg space probe be launched vertically from the surface of Zero so as to achieve a maximum distance of 4.0*10^6 m from Zero's center? The Attempt at a Solution I...

What is the first result on Gravity Probe B? Please tell me.

Hi Guys, I am stuck at a point and needs help. The thing is I am doing MOSFET inverters using Pspice. I am getting its VTC (voltage characteristic Curve) But I don't know how to get derivative of this curve in order to obtain some parameters required for Noise margin. Here is the file...

How far from Earth must a space probe be along a line toward the Sun so that the Sun's gravitational pull on the probe balances the Earth's pull? I'm actually just confused as to how to set this up. I know that I need to consider d being the distance from the Earth to the sun and r being the...

How far from Jupiter must a space probe be along a line toward the Sun so that the Sun's gravitational pull on the probe balances Jupiter's pull? i know that i need to use m1/r2=m2/((2.78e-11)-r)squared but my answers keep coming out wrong. For an answer, i got 2.4e7 km

Hi, I'm kinda lost on these 2 problems. A space probe is traveling in outer space with a momentum that has a magnitude of 7.15 x 107 kg·m/s. A retrorocket is fired to slow down the probe. It applies a force to the probe that has a magnitude of 1.81 x 106 N and a direction opposite to the...

we drive the Hall probe with ac current and measure the voltage with lock-in amplifier but the problem is that after some time the probe does not function(no current passes through it). Hall probe is driven with the alternative current from the sine output of the lock-in and i max is...

We can probe the isotropy of the universe by observing the universe just from a single place. However, as I know, that is not true for homogeneity. What type of expriments we can carry out on ground or spcae, for probing the homogeneity of the universe.

http://www.washingtonpost.com/wp-dyn/content/article/2006/03/04/AR2006030400860.html It's been two years why they just starting to lanuch a crimnal investegation? I don't watch football.But I'am kind of intersted to see what if it was propous what was the motive.

The Gravity Probe B satellite has placed four (over redundant) gyroscopes in low polar Earth orbit to primarily test two predictions of General Relativity. The first effect being tested is (for the GP-B polar orbit) a N-S geodetic precession, caused by the amount a gyro 'leans' over into the...

http://www.guardian.co.uk/science/story/0,3605,1652178,00.html ---quote from Guardian--- Probe returning to Earth after asteroid landing Alok Jha Monday November 28, 2005 The Guardian The Japanese space probe Hayabusa began its journey home yesterday after becoming the first...

This is a problem that has been giving me trouble, wondering if I could get some input: A space probe of mass m is dropped into a previously unexplored spherical cloud of gas and dust, and accelerates toward the center of the cloud under the influence of the cloud’s gravity. Measurements...

Does anyone have any preliminary, or otherwise, information as to the results of Gravity Probe B?

I have a display in my car that registers outside temperature. It seems to be accurate even in the most adverse circumstances, such as when parked in a parking lot in the sun for a long time. I feel the temperature standing there well over the hundreds, yet the temp gauge does not seem to be...

I was looking at some web sites about the Gravity Probe B. Some show the spin axes of the gyroscopes oriented perpendicular to the Earth or else in the direction of movement of the satelite. Wouldn't these orientations cause lots of precession? I'd expect the gyroscopes' axes of rotation to...

[FONT=Century Gothic]to calibrate a hall probe, i know we have to generate a known magnetic filed strength (B)...but how?? Is there an equation relating the "B" with measurable currents, etc? Thanks for helping guyz!

Hi there! I am have to plan an investigation. I have to calibrate a Hall probe to measure magnetic flux density and then investigate how the separation between two bar magnets has an effect on the magnetic flux density. Can anyone help with calibrating a hall probe? I have searched the net...

there are two permamnent bar magnets put with a south pole facing a north pole. there is a magnetic field in between the bar magnets. i need to use the hall probe to measure the field strentgh. the probe measures a hall voltage and i can convert this to magnetic field strength values using...

Ok, like all A2 students I've got this darn planning exp. For the calibration of my Hall probe I have proposed measuring the voltage from two fields of known strength. By using a solenoid (a uniform field) I can use the equation B=Miu n L to work out the flux of the field but have become a...

Those of you who use EPMA or would like to learn about it, check this out. http://jan.ucc.nau.edu/~wittke/Microprobe/Course%20Overview.html

I'm planning an investigation on how magnetic flux density midway between opposite poles of 2 bar magnets varies with separation of the bar magnets (using a Hall Probe). [simply as shown in attachment] To do this, I'll need to calibrate a hall probe (which I think is done by working out the...

For a planning exercise i have to calibrate a hall probe to measure the magnetic flux density mid-way between opposite poles of two permanent bar magnets. anyone know how to calibrate a hall probe so that i can do this experiment?

Where could I find out how a Hall probe works? I have got a book in mind called Introduction to electronics by Theodore Korneff but am not sure how useful it will be. I have searched the web but cannot find a description of its working. :cry: James

http://www.fileplace.info/14012005/3697.jpg This creature has been spotted by the Huygens probe in the surface of Titan... Now is clear that the next objective of such abject monsters will be the invasion of Earth. I think that I'm going to hide myself in my underground hideaway...

here is an article posted yesterday (Friday) http://www.rednova.com/news/display/?id=96361 what other articles do you have about this? a flyby of Titan by the Cassini craft releasing a small probe, Huygens, intended to parachute to surface (possibly liquid) Cassini will come within...

Okay ppl, I have a question, I'd just like you to check that my working here is correct. Q: A space probe of mass m=490kg is driven by an ion propulsion motor that involves the use of positive ions, each of mass m=2.18*10^-25 kg and having a charge of magnitude e=1.6*10^-19 C. These ions...

Gravity probe B is designed to detect the distortion of space (both the linear compression and lateral shear of the vacuum) that the mass of the Earth produces by it's presence in space and it's rotation on it's axis. The hope is that this might be seen in the anticipated deflection of very...

After three months in orbit, following its launch on 20 April, Gravity Probe B has now entered its science phase. This success comes after about 40 years of a long saga of planning and construction and three unsuccessful cancellations by NASA in ’89, ’93, and ‘95. The project went through...

In 1998, the Mars Climate Orbiter probe crashed into the surface of Mars, instead of entering orbit. The resulting inquiry revealed that NASA navigators had been making minor course corrections in SI units, whereas the software written by the probe's makers implicitly used British units. The...

Im a novice on waves what I want to know is for instance a space probe transmiting a pic to Earth does it use radio waves ? And does it have to transmit in direction of Earth or could we receive pics on another plant and what size area do these waves occupy i.e when they hit Earth does it equate...

Assuming that everything works correctly, is there any question about what the results will be? Would any surprise whatsoever be fundamentally significant - even "Earth'shaking"?

A friend of mine was at Vandenburg for the launch. I just spoke with her by phone and she gave me a guest's-eye view of the proceedings. She says the briefings and talks earlier were a big part of it. Almost more than watching the actual launch. It was too windy in the high atmosphere for...

[FONT=Arial Black]Gravity probe launching countdown : For those who haven't heard yet...After almost 40 years ,one of the neatest experiments for testing GR will be finally conducted : http://einstein.stanford.edu/

hello, here is my second message.(and my English is still very bad) I don't understand these 3 little experiments(we need Helmholtz coils and a Hall Effect probe) I know I have to draw a graph for each situation but I can't interpret the difference between the theory and the experiment...

In GPB's experimental conditions, a negligible amount of precession takes place. So in terms of rotational inertia, why does the spin axis of a gyroscopes remain pointing in the same direction? Also, why would changes in space-time cause the axis to change? Thanks

I have figured out what happened to the Mars probe! Click on the attachment photo to find out...