Here is the last page of part 5.

https://www.physicsforums.com/threads/random-thoughts-part-5.851969/page-134]]>

View attachment 105223

V=IR

Hello. I am working on this problem and I just wanted someone to check it out if I did it correctly. I was kinda confused...

Determine Unknown Elements and Node Voltages (ECE 210)]]>

A. Draw a free body diagram for the electric force acting on Q1, Q2, and Q3.

B. Find the magnitude of the force between Q1 and...

Draw a free body diagram for the electric force]]>

Example: If you had a string and you sent a wave down one end, and the opposite wave from the other, once they meet there will be an instant when the string is flat as if there had never been waves introduced. But, if...

Does Destructive Interference Cancel Energy?]]>

This semester I will take:

1. Chinese 1 (required)

2. Linear Algebra

3. Modern Physics

4. Physics problem solving (a drill of advanced multi-step calc-based physics problems from...

Would this course load be manageable?]]>

If i close the browser and...

system hangs for anybody elsewhen try to post?]]>

My wife just drew this

View attachment 93241]]>

I am trying to look for a mask that is able to withstand the attack of the etching...

how to etch (100) p-tye Si]]>

I'm trying to calculate Moon revolution period but always got 27.53 instead of 27.32.

G = 6.674e-11 (m^3 kg^-1 s^-2)

M = 5.9724e24 (kg) from http://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html

R = 384400000 (m) Earth Moon distance

From 4π^2 * R^3 = GM*T^2,

got moon...

Moon revolution period 27.32, but got 27.53 from equation?]]>

First, imagine that the sides of the equilateral parallelogram are the two vectors ##\vec{A}## and ##\vec{B}##. Since the figure is equilateral, their magnitudes must be...

Show that the diagonals are perpendicular using vectors]]>

Say you have 4 apples, 3 strawberries and 6 carrots...

a) If 4 items are to be selected, how many combinations are there?

b) How many combinations will have no carrots?

c) How many combinations will have at least 1 apple?

d) Create the probability distribution table for strawberries....

A simple (?) combinatorics question...]]>

[itex]|1>[/itex] and [itex]|2>[/itex] form an orthonormal basis for a two-level system. The Hamiltonian of this system is given by:

[tex]

\hat{H} = \epsilon

\begin{pmatrix}

1 & i \\

-i & 1

\end{pmatrix}

[/tex]

a.) Is this...

Two-Level Quantum System, Need help Finding State at time t]]>

Can you extract useful work from vacuum energy?]]>

Consider two points located at ##\vec{r}_1## and ##\vec{r}_2##, and separated by distance ##r = |\vec{r}_1 - \vec{r}_2|##. Find a time-dependent vector ##\vec{A} (t)## from the origin that is at ##\vec{r}_1## at time ##t_1## and...

Derive vector that moves uniformly from one point to anothe]]>

The first approach is the traditional one. It is the approach that Einstein presented in his paper and that is taught in most of the basic textbooks. In this approach,...

How to bridge the gap between these approaches to SR?]]>

A semi-circle of radius R has a charge Q uniformly distributed over its length, which provides a line charge density λ. Determine E at the origin.

Semi-circle linear charge Electric Field]]>

I have found this by searching net. The inventor claimed that by using a new kind of piston fitted with fins, he achieved almost isothermal compression and greatly reduced the power consumption process. I want to know how much theoretically sound it is.]]>

It would seem to me that the Beta type stirling engine (with 1 cylinder) would be very efficient because it only has like 3 major moving parts....flywheel crankshaft and piston and...

Why do Stirling engines have low power/weight?]]>

dΦ/dx

where γ is the speed of light in units of c, and the x

How is this equation...

Physics and Geometry 2]]>

Thanks in advance.]]>

We have got two particles with [itex]S_1=1[/itex] and [itex]S_2=1[/itex]. We know that [itex]S_{1z}|\psi_1\rangle=\hbar |\psi_1\rangle[/itex] and [itex] S_{2x}|\psi_2\rangle = \hbar |\psi_2\rangle. [/itex]

a) Find wave...

Two particles with spin - measurements]]>

14 // Change these pin numbers to the pins connected to your encoder.

15 // Best...

15 // Best...

Help finding a rotary encoder with interupt capabilities]]>

I know...

Phd one class at a time? Going back for another Bachelors?]]>

Relative Acceleration]]>

about current from a battery going through our body]]>

A few photos so far. I will post the schematic when I finish it....

Building a vacuum tube amp from scratch]]>

the units for T is temperature in Celsius and c is measured in cal/gK.

2.0 g of the...

Difference between using temperature in Celsius and Kelvin]]>

One end of a light spring with force constant

k 5 100 N/m is attached to a vertical wall. A light string

is tied to the other end of the horizontal spring. As

shown in Figure P15.73, the string changes from horizontal

to vertical as...

Simple Harmonic Motion with Rotational Inertia]]>

Forces/Moments on Complex Beam System]]>

BJT transistor analysis: common emitter confusion]]>

How to Study Science: Integrating Spaced Repetition Review]]>

In the system shown in Fig. ##2E.5 (a)##. block ##m_2## is being prevented from descending by pulling ##m_1## to the right with force ##F##. Assuming all the surfaces to be frictionless, Find ##F##

View attachment 105144 ...

Condition to not let the block descend]]>

Juno/JunoCam mission]]>

I know that there is no electric field on the inner surface, as shown by Gauss's Law, but that isn't enough information to say that the potential (V) there is zero since E = dV/dr, so V could be a nonzero constant....

Potential on the inner surface of a spherical shell]]>

From what I understand space does not actually curve but rather test particles tracing out their world lines in Euclidean space as compared to ones tracing out their world lines near a source of gravity is the physical meaning of...

Physical meaning of Curvature]]>

If I have a light year long rod and push it on one end, how long would it take for the other end to move?

Still Unsure of this answer.

Main Question:

If I had 2, light-year long conductive rods with a voltmeter attached at the ends then...

Light Year Long Confusion]]>

This isn't exactly a "problem" per se , but I need to understand it for a course i'm taking. I'm trying to understand the significance and when to use the vector conversion matrices, or just the identities. I'll use an example...

trying to understand vector conversion matrices]]>

I'm also interested in the creative business and entrepreneurial ends of these technologies.

Any advice on what specific kinds of internships I should...

What kinds of internships in biotech/Med should I look for?]]>

A polynomial, P(x), is fourth degree and has all odd-integer coefficients. What is the maximum possible number of rational solutions to P(x)=0?

P(x) =...

Rational roots of 4th degree polynomial with odd coefficents]]>

I am working on a product design which would be used sub sea. It is designed to lift a small load off the sea bed. I have not worked out the exact details yet but the following should be a good start:

Load 30Kg

Depth 30m

I plan on using an air bag of some description - the bag needs to...

Subsea Engineering Question - air required to lift load]]>

First, we have three vectors ##\vec{A} ~\vec{B} ~\vec{C}## such that ##\vec{A} + \vec{B} + \vec{C} = 0##. This creates a triangle. Then, we label the angles opposite the respective sides as a, b, and c. I am not sure where to go...

Deriving law of sines from cross product]]>

Is Engineering as monotonous and "boring" as suggested?]]>

There are 5 letters, ABCDE. How many unique combinations of 3 letters can be made if letter A must be part of the combinations?

The solution is that because A must be one of the letters, that only leaves two other letters which you can manipulate. So the answer is...

Combinations Help]]>

but the higgs field carries...

clarification of Higgs field, Higgs boson and gravitons]]>

2D plotting error help!]]>

Taking a Fifth Year as an Undergrad in Physics Before Applying to Grad School?]]>

]]>

Please start off with "Today I learned". Keep commentary to a minimum and just LIKE posts. I'll start!

Today I learned that you clean...

Today I learned]]>

So far, I've just found formulas for certain ionization coefficients and electric fields, but no current...

Corona discharge current formula]]>

Bending moments at equillibrium]]>

Thermodynamics of an Arctic greenhouse?]]>

Write the given numbers in the polar form ##re^{i\theta}##.

## \frac {2i} {(3e^{4+i})} ##

## z = re^(i\theta) ##

## \theta = Arg(z) ##

## r = |z| = \sqrt { x^2 + y^2 } ##

Complex Analysis - Exponential Form]]>

why use the Legendre transform over back substitution]]>

Artificial gravity concept]]>

I want to be able to supply a radius of the first circle that is to fit into this large circle. Lets say R1 is 0.75 * R0.

Following this I find the best position of R2 (to maximise its...

Fitting circles inside other circles]]>

In DCE-MRI changes in signal in an artery and the tissue are converted to contrast agent concentration vs time...

Why can't quantitative values be computed using DSC-MRI?]]>

Great Collider & Naturalness]]>

##

\gamma = \int_0^\infty \left( {1 \over 1 - e^{-x}} - {1 \over x} \right) e^{-x} dx \qquad Eq.1...

Relating integral expressions for Euler's constant]]>

1. The problem statement, all variables and given/known data

i study for my exams. here is my current problem:

a non-specific conductor is connected to an ideal battery (surrounding temperature: 20°C) and reaches a temperature of 24 °C . after cut in half it is again connected to...

calculate temperature of a conductor]]>

It reads:

The surface area, A, of a sphere with radius R is given by

A=4πR^2

Re-derive this formula and write down the 3 essential steps. This formula is usually derived from a double...

re-derive the surface area of a sphere]]>

What is the distance from the point P to the plane S?

## S = \left \{ r_{0} + s(u_{1},u_{2},u_{3})+t(v_{1},v_{2},v_{3}) | s,t \in \mathbb{R} \right \} ##

I...

Distance from a point to a plane]]>

So for example, one Computer might take 10 seconds...

How to increase processing speed / power of a computer?]]>

This hypothetical is about the observable universe only. 93 billion light-years diameter, isotropic,...

If the observable universe was visible to the naked eye...]]>

Two metal disks, one with radius R1 = 2.50 cm and

mass M1 = 0.80 kg and the other with radius R2 = 5.00 cm and

mass M2 = 1.60 kg, are welded together and mounted on a frictionless

axis through their common center, as in Problem...

Rotational Motion - 2 Disc System]]>

My question is, what if we discard string theory -...

constants of nature in the early universe]]>

solar heat exhanger on a pool]]>

I think it was a very interesting idea, so I'll try to rephrase the question so that it can't be banned for racism. It will also be a good update to earlier threads...

What do you look like?]]>

What does it take to understand quantum mechanics?]]>

View attachment 104700

The ball of mass m and radius r is released from horizontal position, the edge of the bowl.

What are the tangential and radial accelerations at angle θ and what is the velocity.

What should be the...

Ball rotates in a rough bowl]]>

Can you do advanced engineering without an advanced degree?]]>

http://imgur.com/a/QY1Fs

View attachment 105153

F=dp/dt

P=F/A

I do not have the answer to this problem. Its not for homework so i won't be...

Pressure on an open piston (derivation)]]>

I am a layperson, and have very little understanding of physics.

I'm trying to understand the relation between a magnetic field and air and how they are similar or dissimilar in terms of disturbance in them.

Let me lay out the context from which I came to think about the question....

Transducer magnet and make sense of sound pickup]]>

An electron and another particle experience an attractive force of 0.0096 N when they are 0.001m apart. what is the charge of the other particle

q1= -1.602E-19

F=-0.0096

r=0.001

how do you find q2 out...

Coulombs law and particle charges]]>

I can read things some people can't read so I read them and then write them again only now those people can read it.

Now's your turn.]]>

Gas Spring and Linear Actuator calculation...]]>

How should I prepare for a Physics Undergrad?]]>

So what is your opinion on being great??]]>

I have learned that there is no insulation for magnetic lines of flux. I understand the Meissner effect; super cooled metals passing through a transition stage becoming super conducting. I understand that lines of flux...

I would like to learn more about magnetic compression]]>

https://www.physicsforums.com/insights/quantum-mechanics-difficult/]]>

I'm a software engineer, I graduated in 2013 as a mature student and I'm now at a senior level. I wanted to pursue a Masters degree and I've found an accredited distance learning MSc. in the UK ( https://www.ljmu.ac.uk/study/courses/postgraduates/astrophysics-msc)

I'm...

How best to prepare for MSc. in Astrophysics]]>

Beginning with this theme, I will periodically choose a theme that will focus on a particular world culture. Your photo must have, as its main theme, something that relates to either that country, or that particular culture. This can be...

PF Photo Contest - World Culture 1-Norway (8/28-9/2)]]>

Participants were asked to post pictures consisting of only one color in the entire photo. So you get to vote on which photo and which color that you like.

1. OmCheeto...

VOTE PF Photo Contest - The One True Color]]>

two protons are 1.0m apart. find the force acting on them.

q1= 1.602E-19C

q2= 1.602E-19c

i just dont get how to work it out

ive got this far up to now...

confused about coulombs law]]>

u= distance from the object to the mirror

v = distance from the image to the mirror

f = focal length

I don't understand what they are talking about and I would like to

2. Relevant equations

If the image is real...

1/u + 1/v = 1/f]]>

Activation energy for chemical reaction]]>

What are your views ? I am...

Is the second law of thermodynamics a law or a tautology?]]>

Imagine a uniform, symmetric rod, free to rotate around an axis going into the computer screen through the center of the rod. Now say that we start off the rod so that it is not horizontal or vertical, but somewhere in between....

How does a rod rotate due to gravity?]]>

First, though most would agree there are issues, people won't...

YOU!: Fix the US Energy Crisis]]>

1. To the position where you see the object (the place where the object used to...

Where does gravity point?]]>

i came across this video on BBC yesterday:

Now I wonder how this stuff works in detail?

Is it the carrier wave or the multiplexer signal of the phone???

best regards]]>