Peak Definition and 233 Threads

Greetings, I’m constructing a machine that involves a linear actuator powered by a 12vdc motor. My linear actuator has a foot that crushes an aluminum soda can until the motor’s torque maxes out and it stalls. The machine is intermittent duty at about 6 seconds of use every 3 minutes. My machine...

Hey guys, I've just got a couple of questions about this prelab I need to do for the Double Slit experiment. And just to make sure this is clear (I have no idea whether the method used in this experiment is normal) we have a double slit and a slit blocker. The slit blocker is after the...

What does it mean if one found negative absorption in uv-vis absorption graph?

General enquiries (template may not be suitable) - When the question provides value of AC voltage amplitude, is this the same value of peak voltage? - Also, in current waveform, when do we use peak current and rms current? - In ohm's law equations we use rms current, so in the current...

Is there any reason to expect both the star formation history and the angular diameter distance to peak at around the same value (redshift ~ 1.6)?

Hey guys! It seems that there are a few users here, so I will post the same question I posted over at chromforum.org: -------------------------------------------------- Hello All! :smile: I am quite new here and to GC in general, so I hope you can bear with me. I will try to keep this...

Homework Statement A spring is hung from a ceiling, and an object attached to its lower end stretches the spring by a distance of 5.00 cm from its unstretched position when the system is in equilibrium. If the spring constant is 43.2 N/m, determine the mass of the object. (answer in kg)...

Could someone explain what the 'first order' diffraction peak is?

Homework Statement Hi, Two given Voltages: U1(t)= 40V * cos(wt) U2(t)= 120V * sin(wt) wheres w means omega. Now I have to sum them up to U3= U1+U2 and calculate the peak value of U3. 2. The attempt at a solution My problem is, I'm not sure if the following is...

Homework Statement Imagine you have a magnet (Henceforth named MagX) which weighs .03lbs, and it is being continuously pushed by another magnet's polar likes (Henceforth named MagY) with a force of 3 PSI. Is it possible to find the peak velocity of MagX, assuming that MagY stays at a constant...

Homework Statement Determine the peak value of current of: \underline{I} = \frac{120\angle0^0}{10+j10} The Attempt at a Solution I change this into polar form and got: \underline{I} = 12.0 \angle -45^0 Therefore, the peak value of the current should be 12.0 A. However, the...

When we are considering the how much optical power a component/pin detector can withstand, are we more concerned about keeping an eye on the peak power or can we ignore the peak power so long as the average power is below some threshold value?

Excuse the obvious question. I feel like I should have picked this up somewhere along the way, but the more I think about it the more unsure I am. My question is: In a gamma spectrum, what determines the energy of an X-Ray peak. What causes it?

Homework Statement The open loop transfer function to a unity negative feedback system is given as: G(s)=50/s(s+10) Homework Equations Unity feedback is used in this problem, and the system input is a step function. Y(s)=50/s(s^2+10s+50) The Attempt at a Solution I have...

I'm trying to get a method to determine the time, t, when two sine waves added together peak, an exact solution. For instance, F(t) = sin(w1*t) + sin(w2*t) Obviously this is not really mathematically straightforward because there are infinitely many solution based on the nature of the sine...

Dear all, Searching proofs for Dark energy, people always mention "the first acoustic peak in CMB". can anyone tell me what exactly is that? how long did we expect it to be and now -having Dark energy- how long do we see it? can anyone help me please?

Note: This is not a homework or coursework, simply revision for an exam. Thanks Homework Statement [PLAIN]http://img194.imageshack.us/img194/223/question2z.jpg Homework Equations Peak voltage = RMS voltage x root2 r = T/(2RlC) T = 1/f The Attempt at a Solution part d)...

I need to calculate a number of things: 1. the torque of the wheels. 2. The peak power, i am assuming it means of the wheels 3. the work done. i know: total mass (car+wheel): 680kg. mass of wheel: 22.67kg there are 4 wheels. radius of each wheel = .203m time: 8s. acceleration: 26.82m/s^2...

I have a question about a magnets position over a coil of wire in an A.C generator. Is the voltage in the coil at Peak as long as its covered by the magnet? and then the voltage starts to decrease to 0 volts as the magnet starts uncovering the coil until the magnet totally uncovers the coil and...

Homework Statement A simple generator has a coil with dimensions 1.0 cm x 1.0 cm which is rotated at 60 Hz in 1.0 T magnetic field. How many windings (turns of wire) are needed to generate a peak emf of 120 Volts ? Homework Equations 1. emf E = - d (magnetic flux) / dt 2. magnetic flux = (B...

I have collected time-domain acceleration signals from the test rig through an accelerometer. Voltage signals are scaled to acceleration signals based on voltage sensitivity of accelerometer. Please refer the link given at the last to get the link for PDF attachment to see the time domain...

I am trying to figure out what the peak to peak of 2.00 cm diameter coil with 4000 turns at a frequency of 1000 Hz. However, I know that more turns will release more emf. Number of turns * Cross sectional Area of one coil = Number of turns * cross-sectional area of another coil. However, I am...

Herro guys, I'm trying to build a motor for shop class (from scratch really, new manifolds, ect :o), I'm only 15 so please take it easy on me :redface: Anyways, I've been trying to calculate my ideal runner length/diameter and stufflets for the intake manifold design. I've got a question...

LC circuit! Homework Statement A 550 microfarad capacitor is connected across a 1.35 H inductor. At a certain time, the charge on the capacitor is zero and the current is 0.362 A. How much later will the capacitor charge reach its peak? What's the total energy in the circuit? What is...

Ok, so say I have a system at a global temperature, I add an energy source (laser in this case) and it heats the system in a localized area. This leads to a maximum temperature peak in the system. Then you can get out a change in temperature from this maximum to the global. OK, now my...

First I try to find a way of finding area under Gaussian peak by using simple means. Questions at bottom of post. This concerns peaks with Gaussian distribution, eg. peaks in a chromatogram in some chemical analysis. The Gaussian distribution is f(x) = \frac{1}{\sigma...

Steve Mohr of Australia's Newcastle University has modeled the Earth's fossil fuel reserves and come up with this massive study (warning: 13mb). PROJECTION OF WORLD FOSSIL FUEL PRODUCTION WITH SUPPLY AND DEMAND INTERACTIONS...

Do you guys think we reached the peak of our evolution? Is there any higher advanced form we can evolve into as time passes, or are we really at our peak? Natural selection doesn't appear to take place for humans anymore, since the average human isn't being weeded out by some physical defect.

Hi there I have read that the area of a peak can be approximated by summing the recorded peak intensities. I can't see how this works? If you add all the peak intensities together is not just the magnitude of their sum and not the area of the surface the peak overlays? Someone told me that...

Hi. I am working on a circuit to control a dc motor using a pwm signal. The problem is that the pwm source (a LabJack UE9 DAQ) doesn't send a ttl signal, but a 0-3.5 volt signal (3.5 peak to peak). The power transistor needs about 5 volts to open completely between source and drain. A...

Hey guys, I am new here and had a question. I currently have a 1 V peak (2 Vpp) AC wave coming into my system and I want to find the most efficient way to convert it into DC. A simple bridge wouldn't work for me because too much of the voltage would be dropped across the diodes. The system...

I'm doing signal processing using MATLAB. But facing problem when doing Peak Detection. This is the signal that I used for the processing: This is what i wish to do: a) the horizontal line is the threshold point and b) the circle is the peak detection Can anyone help me...

4clue

Hey, For my first post here, I had a question about the gamma spectrum of Na-22. I measured the gamma spectrum of Na-22 with a Ge-spectrometer. Using Genie-2000 software I saw two peaks in the spectrum, 1274 keV (peaksurface 3981±1,74%) and 511 keV (peaksurface 25494±0,68%). (Horizontal...

Hi can somebody help me with part B of this question please? :) I already did part a) and I found the peak current to be 31.1 mA, and the power rating required to be 4.84 W. For part B I know the current for inductance is I=(1/L)\intVdt and I know V=V0sin(wt), however with only this...

I have a curve defined by some points. These points represent the pixel brightness on the image sensor For example get these values: 5 14 60 111 100 37 Where is the brightness peak? Somewhere between pixel 4 and 5... ~4,3 Is there a method to determine this? Something with a name or...

Hello guys, I have a file with X Y values (separated by space) I want to scan the data to find the PEAK in the file. (It will probably be a lowest Y point...) How do I do this is Fortran? Thank you, Alexander

This is the only question in my physics section of projectiles I am having trouble with (This is ranked as the hardest question in this section of my text, please cut me some slack :P), because I have no idea how I would go about finding the intersection point of the skier with the slope. The...

Hope somebody can help me. I`m currently doing analysis of determining single crystal of Zr2Cu on a surface of bulk metal. Through XRD, i determine the peak and compared it with data from JCPDS card. My problem is I don`t know the correct way to compare the theoritical 2theta peak(from...

Hi everyone! I hope you people can help me out at a problem I am stuck with: Homework Statement Find the peak voltage across the capacitor "C" All variables given and an image of the circuit are: http://img36.imageshack.us/img36/580/photo2fsc.jpg The circuit is connected to...

A baseball is thrown upwards. What is the acceleration at the highest point? i thought the acceleration would be 0 since velocity at the highest point is 0 and the derivative of velocity is acceleration. Since velocity is not changing, shouldn't acceleration be 0? However the answer is...

The size of bouncing lumps of charged particles, DM and photons in the primordial universe is supposed to be around 220,000 lyr (= sound horizon since the acoustic speed is approx 0.6c). If we then calculate the angle A subtended at Earth by a lump of this size W, some 13.8 Glyr away D (back at...

I'm running an experiment where I drop a mass (99.7kg) a distance of 1.8m. The load is suspended from a very rigid structure through a steel cable. I currently have a load cell in series with the cable and mass. I acquire data at 1000Hz and my load cell tells me I have a peak force of about...

Homework Statement An LRC series circuit with R = 200!, L = 32mH, and C = 2.5μF is powered by an ac voltage source of peak voltageV0 = 200V and frequency f = 770Hz. Determine the peak current that flows in this circuit. Homework Equations V= IR -L dI/dT +Q/C = 0 w = 2 pi f...

I NEED TO GET A DERIVATION SO THAT I CAN MATHEMATICALLY UNDERSTAND WHY: The peak voltage or current is divided by square root 2 to get the root mean square value.please i need a simple derivation just to understand,i will be very greatful for ur consideration.thankyou.

Homework Statement I am confused. My thinking was if a voltage source is given in polar form with the magnitude and angle eg. (10 L0o)then it is Vpk and if only magnitude is given then it is Vrms. Is it right. I am really confused. Homework Equations The Attempt at a Solution I...

Hello every1 I hav a basic question bout Design of inverters(Voltage source inverters). Wel Actually what does designing mean? I hav to design a inverter whose output Peak voltage is 50v. The input DC voltage wil b around 55V.I'm using single phase full bridge inverter And i'll b using R...

A coil is located at the center of a long solenoid of radius R = 15cm which has 5x10^7 turns per meter and carries a current I = 16A. The coil is coaxial with the solenoid and consists of 5 turns of wire each in the shape of a square of length a = 5cm on each side.What is the magnetic flux...

http://www.treehugger.com/files/2006/04/peak_copper.php http://www.thenational.ae/article/20080807/FOREIGN/629722880/1013/ART&Profile=1013 Any truth to this, or is this debunkable?

Maybe you've heard about Hubbert peak aka Peak Oil . Otherwise, this threads should be useful for you: https://www.physicsforums.com/showthread.php?t=172175&highlight=hubbert https://www.physicsforums.com/showthread.php?t=184372&highlight=hubbert The global economy it's entirely oil...