(introduction course of university physics)

A 5.0- liter gas tank holds 1.7 moles of monatomic helium (He) and 1.10 mole of diatomic oxygen

(O2), at a temperature of 260 K. The ATOMIC masses of helium and oxygen are 4.0...

RMS speed of gas]]>

Quantum communication satellite!]]>

Using Hund's rules, find the ground state L, S and J of the following atoms: (a) fluorine, (b) magnesium, and (c) titanium.

J = L + S

I'm having trouble...

Using Hund's rules to find ground state L, S, J]]>

http://nonlinear.eecs.berkeley.edu/chaos/RobustOpAmpRealizationOfChuaCircuit.pdf

i have the real circuit mounted and i'm using its parameters for the...

About chua circuit numerical solutions]]>

I am a complete beginner when it comes to circuit analysis that involves anything more than a few resistors and capacitors. Currently, I am working on a project that requires the transmission and reception of IR signals to control a motor. I know the requirements for the motor I...

Circuit Analysis of IR transmitter/receiver]]>

Hello mates.

I was wandering how to analyze an atomic bomb, when the only information given, is that the bomb contains 5,6 kg plutonium, and is the same model as fat...

How to analyse an atomic bomb?]]>

I am working in "Intro to PDEs with Applications" on page 6. Gradients come up in discussions of surfaces expressed as F(x,y,z). In discussing such matters, the buildup includes the assumption that grad F is not equal to the...

Significance of nonvanishing gradient]]>

http://imgur.com/a/FDfAp

What is the phase constant?

x(t) = A*cos(ωt+Φ)

If I'm not mistaken at t = 0 the graph starts at half the amplitude or 5. Also...

Position vs time graph simple harmonic motion phase constant]]>

Cause of multiple paths of electrical breakdown?]]>

Here is the question:

I can not figure out how we are to apply chain rule to the second order derivative. May somebody clarify that?]]>

One is a local university, that offers 4 year degree programs related to...

What's the most appropriate path?]]>

This is the problem: A person blows through a straw between two empty soda cans. Do...

Blowing between two objects -- Why is the pressure low?]]>

In short: For an air leg or air spring, there is a method using a Taylor approximation to find the spring constant for very small displacements, but I can't seem to figure out how it works. I've learned that air legs don't follow Hooke's law very much at all, except for when the...

Approximating a spring constant for an air leg]]>

[tex]A^k = a_0 + a_1 A[/tex]

for k>= 2.

So suppose we have a given k and want to find the coefficients [itex]a_0,a_1[/itex]. We can use the fact that the same equation is satisfied by the...

Using Cayley-Hamilton Theorem to Calculate Matrix Powers]]>

https://www.sciencedaily.com/releases/2016/12/161207093019.htm

All of us who have experienced a 'nervous stomach' under periods of stress suspect that there is a link between our gut and our mood. Now researchers have received strong...

Gut feelings: How the microbiome may affect mental illness]]>

I want to try it again....

capillaries and energy conservation]]>

2 masses are connected by a spring. They are on a frictionless plane inclined relative to the horizontal by ##\alpha##. The masses are free to slide, rotate about their center of mass, and oscillate.

1. Find the Lagrangian as a...

Lagrangian of 2 rot. masses on a spring, sliding down plane]]>

A ring of radius

a) Calculate the electric potential due to the ring as a function of distance from its center along the axis of the ring passing...

Electric potential of a ring]]>

I usually have trouble with these clock...

Time lost or gained by clock]]>

Two metric tensors describing same geometry]]>

The werewolves were known as the Lycans. Has anyone read their books.. how do the Lycans...

Underworld Mythos]]>

What will happen in this case -- 2 chambers connected by a tube...]]>

Essentially, I was wondering if a stream of positrons (ignoring the source and difficulty of production for a...

Is Positron-Catalyzed Fusion Possible?]]>

f(x)= 1/1+e^3x

1+e^3x=0

3xIne=-1

X=-1/3

Horizontal asymptotes:

No horizontal asymptotes

Slant asymptotes:

None

Are the asymptotes I found correct?

Also I was...

Find all asymptotes]]>

Let ##A## be an ##n \times n## matrix. Show that if ##A^2## is the zero matrix, then the only eigenvalue of ##A## is 0.

All eigenvalues and eigenvectors must...

Eigenvalue problem]]>

Ultrafast bridge rectifier module question]]>

View attachment 110202

Although the above derivation involves a projection on the position basis, it appears one can generalize this result by using any complete basis. So despite it not being explicitly mentioned...

Are all wave functions with a continuum basis non-normalizable?]]>

I'm using peltier modules (also called thermoelectric modules) for a student project. If you're not familiar, they are small semiconductor devices that when heated on one side and cooled on another, power flows due to the Seebeck effect.

I'd like to measure power coming from...

Meter R for V^2/R measurement?]]>

left hand touches adc pin. right hand touches...

water as touch surface]]>

If f(x) is a scalar-valued function, show that ∂ƒ²/∂x

N/A

I don't even know where to...

Struggling immensely with tensors in multivariable calculus]]>

A 25- L container holds ideal hydrogen (H2) gas at a gauge pressure of 0.25 atm and a

temperature of 0°C. What mass of hydrogen gas is in this container? The ATOMIC mass of...

Gas law hydrogen problem]]>

I am actually stumped by this seemingly...

Two particles undergoing circular motion]]>

http://www.reuters.com/article/us-usa-energy-bankruptcy-analysis-idUSKBN13X0EG

I don't know how many of us here know about the Reanima project, but I want to know whether this is scientifically possible or not. In short, whether it's a breakthrough or another hoax!]]>

View attachment 110203

For beta = 100 and assuming r

I

I

Analog electronics (BJT circuit analysis)]]>

Numerical solution of Schrödinger equation]]>

6% of any purchase you make is sent to Physics Forums. Think about buying your text books or electronics... anything here.

Just click this link and the tracking system will register that PF sent you. Thanks!!...

Support PF: buy on Amazon.com from here]]>

a 4.22g mixture of CaCl

Stoichiometry: confused about the question]]>

Show that ##A## and ##A^T## have the same eigenvalues.

If they have the same eigenvalues, then ##Ax = \lambda x## iff ##A^T x = \lambda x##. In other words, we...

Show that A and its transpose have the same eigenvalues]]>

Imagine that each random sequence that comes out of the SPOT detectors is a coded message. When...

Simple proof of Bell's theorem]]>

Does the Many-Worlds Interpretation demand that every physically possible scenario has to be played out somewhere in the Multiverse? David Deutsch has told me that yes this is true (including absurd/ unlikely scenarios...although those would...

Is MWI deterministic or not?]]>

it brings to mind as well the many worlds theory

the cyclic model is shown in a futuruma episode where the professor builds a only forward time machine(consistent with relativity)

but he goes so far into the future that he ends in the past...

Futurama: How plausible is the cyclic model, is it mainstream?]]>

A vertical rod is rotating about its longitudinal axis at a constant angular velocity Ω. It is allowed to swing freely from the endpoint A. The angle between the rod and the longitudinal axis of the system is denoted by θ. Point...

rotating rod]]>

It shows detailed 3D structure of dinosaur feathers from 99...

Dinosaur Feathers (in amber)]]>

The second moment of area of the beam shown about the neutral axis X X is 4x10^6mm^4

Find the maximum bending stresses, tensile and compressive, set up in a beam of this section 2.6m long and simply supported at its ends and...

Bending stresses]]>

Now, there...

Calculating power spectral density from FFT]]>

$$mgh = \frac{1}{2}v^2$$

I'm working on a). I tried using conservation of energy to get v.

$$mg(c+b) =...

Ice cube sliding off metal roof]]>

But when I measure and find out through which slit the horizontally polarized photon went, I automatically know that the vertically...

Does the double-slit experiment create path-entangled states]]>

Which is an acceptable Lewis structure for Diazomethane?

None

The answer cannot be C or D, as both of these resonance structures are incorrect. I thought the...

Diazomethane Resonance]]>

Transformer winding disparity]]>

Device for rotating a cord]]>

I've been trying to install LEd, but it's not going smoothly, so I don't want to waste anymore time if it's not worth it.

Any suggestions?]]>

Digital Trainer board]]>

Deriving the volume of a sphere using semi-circles]]>

Consider the following problems

View attachment 110194

In #2, they start the solution by saying: r(t)=u(t-1)

in #3, they start by saying that r(t)=t-tu(t-1)

I understand how to solve the problem once you get r(t), I just...

How to find r(t) when we are given conditions - ODE]]>

If the energy of a system depends on ##E = \alpha |x|## where ##\alpha## is positive, what is the average energy of the system?

I've been given no information...

Average energy of a system]]>

Using the polar formula for an ellipse, and Kepler's second law, find the time-weighted average distance in an elliptical orbit.

The polar formula for an ellipse:

$$r = \frac { a(1-e^2)} {1 \pm...

Time-weighted average distance in an elliptical orbit]]>

Starting books for Quantum Mechanics]]>

You'll see, I am self studying physics, and have already finished with Kleppner - Kolenkow mechanics (complemented with Morin) and Griffiths electrodynamics.

Now I think I am prepared for QM, but I do not know which textbook is better for me. I have reduced my options to Griffiths...

Griffiths or Zettili?]]>

but now you put him inside a tube where he can move along varying the radius of the circle

now the normal acceleration will be zero because he is in the...

A doubt on tangential and normal aceleration, pilot g forces]]>

Now I'm currently in university majoring in civil engineering taking Calc III and I feel overwhelmed by everything taught in class. No matter...

Why is math so hard?]]>

Beam-powered propulsion - keeping the beam focused]]>

Crackpot ads in mobile site]]>

Calculating the mass of a galaxy bulge]]>

http://geofon.gfz-potsdam.de/eqinfo/seismon/globmon.php

http://earthquake.usgs.gov/earthquakes/eventpage/us20007z8m#region-info]]>

This particular question has been raised in past posts and I have studied those posts but unable to take anything from them. Basically the question comprises 2 parts. Part A requires us to find the current through "I" using...

Nodal Analysis]]>

A simple question about light]]>

$$\int_{0}^{2} r\sqrt{5-\sqrt{4-r^2}} dr$$

would i substitute ##u=4-r^2##?

After of which I would input in to the integral and get:

$$\int_{0}^{2}...

substitution rule integrals]]>

to the output voltage V

View attachment 110191

To calculate the contribution of E

ECG Circuit Analysis]]>

Stopping door heat loss with curtain]]>

I have found temperature...

Thermal expansion of a pipe with wall temperature gradient]]>

The principle states that a universal computing device can simulate every physical process.

Not sure where to post this, as it seems like a pertinent question in proving the simulated universe thesis right or wrong along with

Proving The Church-Turing-Deutsch Principle]]>

Consider a pulley with a mass-less cord attached to its edge. The rope hangs a distance of d= 2.50 m below the bottom of the pulley. Attached to the end of this cord is a block with mass 3.00 kg. There is also an electric motor...

Mass and pulley system (Rotational Dynamics)]]>

A mass is moving with constant acceleration in the x-y plane. At time t = 0s the mass’s position is 2mˆı+3mjˆ, the mass’s velocity is 3 m/s ˆı −4 m / s jˆ and the mass is subject to an acceleration of 1 m/ s ^2 ˆı + 1 m/ s^ 2...

At what time is the velocity perpendicular to the acceleration]]>

I have a suspension mount (square tube with unknown thickness) with a bolt going through it that undergoes an 800 lb load laterally into the bracket in an on/off fashion (NOT fully reversed) at a rate of 50 Hz. Ultimately we...

Static Equivalent force for cyclic load (fatigue related)]]>

Chernobyl recovery]]>

Pneumatics (i know its not in the right area sorry :()]]>

Tasks to do:

a.)give voltage

b.)give the absolute value of charge density for plates

Presumably the absolute values of charge densities for plates is equal between the two of them.

An electron is accelerated in...

electron's energies and charge density in plate-capacitor]]>

Can I get into Caltech?]]>

What is the next radius outwards of this Apollonian gasket?

R = radius of outer circle = 5

r

Solve for unknown radius without trig]]>

Transfering from CC, got a C in calc2. Am I screwed?]]>

Now I read the...

A question regarding Schwinger's Sources' Theory.]]>

3.- Rigged Hilbert space approach does not include mixed states.

I'm not sure about path integral formulation... so...

What is the most general mathematical framework for quantum]]>

1. (35 pts) You have a coop job helping to test a capacitor energy storage system. There is a rather large capacitor with capacitance, C = 2.02F. It is charged to a potential V = 602.V with the polarity of the capacitor as shown....

How to find magnetic field in a square coil next to an RC circuit]]>

A 3.0kg mass is connected to a system of three springs, k1 = 100N/m, k2 = 80N/m, and k3 = 150N/m, as shown below.

(a) Derive the relation between k1, k2, k3 and the equivalent spring constant of the three springs together.

(b)...

Variety of Oscillating systems]]>

Min Vacuum Pressure in Pipe]]>

Is it just a spin 1 state (splits to 3 levels) that undergoes NMR or is there something else happening? I'm...

Nitrogen-Vacancy centres in Diamond for NMR spectroscopy]]>

Is there any other detection's to back this up?

By studying the light emitted from an extraordinarily dense and strongly magnetized neutron star, astronomers may have found the first observational indications of a...

weird quantum property of empty space?]]>

I need to design an automated trap door opener incorporating a motor and at least one of the following: gears, springs, or power screws. It is 36 inches wide and 48 inches long. It is hinged along its width. The door weighs 60 pounds. When closed it is flush with the floor. It must...

Advice for the design of an automatic door opener]]>

Thank you in advance.]]>

I am submitting a pdf and am generating it in LaTex, specifically I'm using TeXShop. Instructions on submission say:

"Ensure that all fonts are embedded in the PDF file and that only Type 1 or TrueType fonts are used. In addition, any offeror who creates files using TeX or LaTeX is...

Embedded fonts from LaTex to PDF]]>

Your personal science library]]>

I graduated college with a GPA that wasn't so much the best. I got a degree in Electrical Engineering. I feel as if I should just go back to college and go over the...

I graduated some time ago, it was a mess]]>

- I hear the intensity of the rain hitting the roof of the car

- there is a lightening flash

- for a couple of seconds the rain intensity eases up noticeably, then resumes

- then the thunder clap follows a little bit later

It...

Lightning discharge's effect on rain fall velocity?]]>

Telecommuting jobs for physics majors?]]>

When firing fast electrons at a carbon target (teltron tube A level type apparatus) is it sufficient to say that if the de...

Electron diffraction experiment puzzle]]>