Meter Definition and 309 Threads

The "size" of the SI meter has its basis in the metric system and it was officially accepted in 1799. We know its size doesn't match its intended 1/10,000,000th division from the equator to the pole, thus it is somewhat arbitrary. Even though the SI meter is defined differently its "size" is...

A sprinter can accelerate with constant acceleration for 4.0s before reaching top speed. He can run the 100-meter dash in 10s. What is his speed as he crosses the finish line? I need help with this problem. I know that for the last 6 seconds because he has reached top speed that he has...

Hi, I'm doing some astronomy work and one problem involves using Rydberg's constant. However, it is inverse meters and I'm confused. Does that mean that it is 1/109737361.6 m? Thanks.

[SOLVED] Can someone check my precision for a meter stick, vernier cailper, and micro Meterstick Precision: 1 mm Example: 607 mm Vernier Caliper Precision: .1 mm Example: 41.5 mm Micrometer Precision : .01 mm Example: .05 mm what I'm asking basically is, is the precision I...

can anyone describe wat is dB level. can dB level be showed through receiver or field strength meter? thx for helping

[b]1. Homework Statement [ i was asked to measure the signal strength. so in my set up for the experiment, is the field strength meter needed together with the receiver. how am i going to set these together at the antenna.izzit , connect the receiver to the battery, antenna to the receiver, AND...

Hello All, I am working on a microcontroller-based control circuit that can generate different frequencies for experiments I am working on, but I also want to add a feature that allows the microcontroller to take voltage measurements from my test setups. The 68HC12 controller board I am using...

I wonder why vacuum is sometimes measured in range from 0 to -1 bar. Is it because of it's measured relatively to normal atmospheric pressure? I guess that normally, vacuum shoud be in range of 0 to 1 bar or something? Can you help me understaning what terms "underpressure" and "overpressure"...

Recently, I found a R-L-C Meter called Smart Tweezers R-L-C Meter from the website of http://www.advancedevices.com/products_tw.htm" . It is quite similar to the Chinese Chopsticks that can be used to take measurements from the devices already mounted on a board. For the through-hole...

Homework Statement A metre stick is found to balance at the 49.5cm mark when placed on a fulcrum. When a 47.7 gram mass is attached at the 1.5cm mark, the fulcrum must be moved to the 38.6cm mark for balance. What is the mass (in grams) of the metre stick. Homework Equations Torque =...

Hi just got a couple of question about errors in measurements. I have a table of results of different meter stick measurements which are accurate to 0.1 cm. Now a meter stick reads to 0.1 cm and the uncertainty is usually 20% of the smallest reading. so all of my readings should be +/-...

Okay, a meter is the distance traveled by light in 1/299792458th of a second. It's relative, so the actual measure of a meter changes depending on your velocity (I won't even go into "Relative to what?", though I do sort of wonder if one could find a 0 point of velocity by measuring light going...

Homework Statement I am looking for a conversion factor that will ultimately get me from units of lux (illumination) which is a weighted scale of light intensity, to watts per square meter, which is not weighted. Homework Equations None availiable The Attempt at a Solution I am...

Can someone help me to design the multirange ohm meter using permenant magnetic moving coil movement...

Homework Statement A superconducting gravity meter can measure changes in gravity of the order = 1×10-11 (delta g)/g. You are hiding behind a tree holding the meter, and your 78 kg friend approaches the tree from the other side. How close to you can your friend get before the meter detects a...

Hi, Just had a bit of a heated discussion with a friend of mine about electricity meters and I decided to get some info from you chaps so I can promptly add some ammo to my argument next time we meet! The claim is that you will get a low resistance reading between phase and neutral meter...

Hello all, I'm a freshman electrical engineering student at the University of Kentucky. I'm also a DJ at http://wrfl881.org" . I was browsing around the awe-inspiring http://www.blinkenlights.de/" at MIT. Now on our campus we have a convienently tall building atop which sits our...

Hi, this question was from an archived thread but I have another relevant question that was not answered by any of the posters-- P.S. The answer to c is NOT mg. Homework Statement A meter stick (L = 1 m) with mass M = 0.409 kg is supported by two strings, one at the 0 cm mark and the...

how do i make a flow meter, using whatever like resistors, capacitors, and make the flow meter go like 10 second per etc help need...i am in EE 2ll basic circuit engineerin? thanks

A physical pendulum consists of a meter stick that is pivoted at a small hole drilled through the stick a distance x from the 50. cm mark. The period of oscillation is observed to be 1.656 s. Find the distance x. I know I have to find the moment of Inertia and I believe the equation for this...

Hello! How do you calculate or determine Newton meter force requirement and rpm's for an electrical motor in the following example: A device that utilizes a shaft that is 2 inches in diameter and 6 feet length. It needs to be able to lift 10 pounds and distance of 7 feet in 6 seconds. I...

^^^^^^^^^^^^ i forgot :P

hi there! i don't have this project, i just want to know if anyone can help me. I am a graduating student and i would like to proposed prepeid electricity meter as our thesis proposal. can somebody help me? or give me other ideas as a thesis proposal.. thanks a lot and god bless... :smile:

Sorry, this sounds like a silly but I grew up in the age of auto-ranging multimeters. Say you have a scale, 1 to 10 and you select your scale as 1 miliamp. I presume if the needle is at 7 then that means 7 miliamps and NOT (7/10) 0.7 miliamps?

Two masses (mA = 3 kg, mB = 6 kg) are attached to a (massless) meter stick, at the 0 and 75 cm marks, respectively. a. Now, if mass B was removed, how much force would need to be exerted at the 100 cm mark in order to keep the meter stick level? b. Now, if mass B was removed, and no...

In quantum mechanics lab our frequency meter shows ~50 Hz when it is plugged into a device which is not turned on. Is this a problem or an effect that I don't know? :rolleyes:

i have to build a vehicle "powered soely by gravitational potential energy that will travel at least a linewar distance of 5 meters under its own power. no elastic potential energy (such as a mousetrap) allowed" i was wondering if anyone out there had any idea on where to start or knew of a...

Is it true that, if power were applied to a one meter cube of quartz crystal and the crystal were driven to the breaking point, the gravity waves produced would definetly, 100%, be orders of magnitude too weak to be detected? Apparently Albert Einstein calculated that

I've attached a circuit schematic for the temperaure intensity meter... R1 is the PTC the first 555 works as monostable so it triggers second 555 to produce Astable pulses with given frequency depending on the values(R3 and R3 and C4) anyway i want to ask if i have to supply my second...

First let me say I appreciate everyone on these forums who takes the time out to help. My question is as follows: It has 2 parts. Part 1: A uniform meter stick (1 m long) is held on its edge against a frictionless table. The meter stick is released and it falls to the table. Part 2...

1 of 2: What would an Ideal Volt Meter read if an Ideal Capacitor had a charge difference of... 6.25 quintillion electrons (6.25 X 10 to the 18th) between its two plates? In other words... if there were 6.25 x 10^18th extra electrons on one plate... and you connected an Ideal Volt Meter...

This is the schematic of my project (figure7)...but I don't know how to add display (ICL7107) using eagle, and how to power display .. how to connect the output voltage of stage2(second opamp) to the display? http://www.seas.upenn.edu/~ee205/Labs97S/Lab7/Lab7.html anyway , take a look at...

The problem states: a 0.13-kg meter stick is held perpendicular to a wall by a 2.5-m string going from the wall to the far end of the stick. (a) find the tension in the string; (b) if a shorter string is used, will its tension be greater than, less than, or the same as that found in part (a)...

A meter sticks moves with velocity 0.60c relative to an observer. The observer measures the length of the meter stick to be L. The problem states that 0.80<L<1.0 m must always be true. So far, I have determined that Gamma = 1/sqrt(1-0.60c^2/c^2) = 0.8. What I don't understand is why there...

"A meter stick is found to balance at the 49.7cm mark when placed on a fulcrum. When a 50 gram mass is attached at the 10cm mark, the fulcrum must be moved to the 39.2 cm mark for balance. What is the mass of the meter stick?" thats the question and the last one on my homework and its given...

Hey, I know there are already many of this threads, but I checked them all out and none can help me in my project. Well, in my project I have limited amount of materials, and I have already tried out various designs with no success, so any help would be great. Here are the details: Drop...

Which would you use advising, a ph meter or acid/base titration? advantages/disadvantages to both?

Yes i had two today, one was because corrosion on the cable fooled my test meter, the other was because a door swich knob was not in mechanical contact with the switch, two in one day is just not fair, i must be getting sloppy, as i have only had two others in my life ,but then i must...

these are the following data: diameter(pipe)=0.1m diameter(throat)=0.05m difference in pressure=55kpa Cd=0.98 question requires me to find the volume flow rate. 1)i know i need to find h(diff in pressure/density*gravity) i have a doubt here where can i just leave the pressure in kpa...

Hi all, I am reviewing for my final and cannot seem to find how to solve the following If the tides on Earth one meter high how far away is the moon? What equations should I use to calulate how the moon effects the tides on earth?

This thread is a continuation of my previous thread, except this one is primarily focusing on the contruction of an amp hour meter and programming it, rather than the gathering of parts for it. (since the parts have just arrived, very slow mail order) I am getting very confused when looking...

I know the formula to use for this problem, but cannot seem to make it come out with a reasonable answer. Can anyone help? If a meter stick travels at the speed of light relative to an observer, how long does the meter stick appear to the observer? (I cannot seem to make the radical...

A uniform meter stick of mass M has a half-filled can of fruit juice of mass m attached to one end. The meter stick and the can balance at a point 12.5 cm from the end of the stick where the can is attached. When the balanced stick-can system is suspended from a scale, the reading on the scale...

Can one read a meter stick down to a tenth of a millimeter? For example, could I reasonably measure an object as 32.43 cm using a meter stick?

Hello, the other day I got an hour meter to help me keep track of the amp hours I have put into my circuit, but I am not too sure how to hook it up. it came with a page of instructions giving a few diagrams on how to connect it, the only 2 that made sense for my application of it was to either...

Alright well I have an equilibrium problem to do and I have sat here and stared at it but it does not really seem to make sense or I can't see a way of solving it: The problem is this(also see attached image): One end of a uniform meter stick is placed against a vertical wall. The other end is...

Watts per squ meter?

water flow venturi meter problem! Heeeelp please :) Hi, The objects of my experiment where 1) to find out the theoretical and experimental pressures in a venturi tube, 2) To determin the coefficient of discharge for the venturi here is the data i collectec...

Does anyone know if it is possible use a soil pH meter to measure the pH of liquids (ie. not soil)? Or a better way to phrase it, is there any diference between a soil pH meter and a normal pH meter meant to be used on liquids that would cause inacuracies or other problems if one was...

Benzun started a thread with this question: I have replied to that question, and want to extend the question (without diverting Benzun's original thead). the related question is, if you have a hollow box or cavity at some temperature T, then how many photons per cubic meter are in it...