IUPAC Names of Organic compounds

August 7, 2018, 10:47 am

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

Name the following compound according to the IUPAC rules: View attachment 228511

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2. Relevant equations


3. The attempt at a solution...

IUPAC Names of Organic compounds

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A gap in biography in application

August 7, 2018, 11:15 am

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I am the second year Master student and I'm planning to apply for PhD this fall. My goal are top schools in the USA and my chances l seem to be pretty good overall (6 published articles, 4 of which are in decent international physics journals like PRB/APL; excellent pGRE and GRE scores, four+...

A gap in biography in application

Random Thoughts part 6

August 7, 2018, 11:18 am

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Time to start a new thread.

Here is the last page of part 5.

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

Intermediate Math Challenge - August 2018

August 7, 2018, 11:36 am

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Summer is coming and brings a new intermediate math challenge! Enjoy! If you find the problems difficult to solve don't be disappointed! Just check our other basic level math challenge thread!

RULES:...

Intermediate Math Challenge - August 2018

Why are you not a ... ?

August 7, 2018, 11:55 am

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I am a theoretical physicist. Why theoretical and not an experimental one? Or why not a mathematician?

Experimental physics gives facts, while theoretical physics gives understanding of the facts. Or loosely speaking, experimental physics gives knowledge, while theoretical physics gives...

Why are you not a ... ?

Hamaker constant and effective attraction

August 7, 2018, 12:28 pm

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Hello,

According to the following equation describing the effective Hamaker constant of two identical bodies immersed in a liquid : A_ALA = (A_A^1/2 - A_L^1/2)², for high values of A_L, the effective attraction of the A-like...

Hamaker constant and effective attraction

A discussion on "officially called a planet"

August 7, 2018, 12:41 pm

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Forking a subject that was in risk of hi-jacking anther thread here.

If the hypothetical TNO "planet 9" is detected , it would not fit the IAU's current criteria of being a planet. What would it be ?

For the sake of discussion let's assume 10 Me and estimated likely distance and orbital...

A discussion on "officially called a planet"

Einstein and Time Machines

August 7, 2018, 12:48 pm

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Does anybody have any references where Einstein speaks about Time Machines?

From collected sources I found, he strongly rejected the idea of Time Machine but through his theory implied that time travel may be possible if wormholes existed.

Something needs to be infinitely fast to do this? Have...

Einstein and Time Machines

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Topology vs Differential Geometry

August 7, 2018, 1:06 pm

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Hello. I am studying Analysis on Manifolds by Munkres. My aim is to be able to study by myself Spivak's Differential Geometry books. The problems is that the proof in Analysis on Manifolds seem many times difficult to understand and I am having SERIOUS trouble picturing myself coming up with...

Topology vs Differential Geometry

Time related story plot device question

August 7, 2018, 1:14 pm

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Hi. So I have a story idea and my main plot device has something to do with time. I want it to be a more science fiction than fantasy so I was hoping someone could help me. The general idea is, a man falls asleep only to wake up 20 years in the future, in one night, he cannot remember the last...

Time related story plot device question

Hawking Radiation and the Negative Energy Particle

August 7, 2018, 1:30 pm

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The following from Wiki re Hawking Radiation:


“... vacuum fluctuations cause a particle–antiparticle pair to appear close to the event horizon of a black hole. One of the pair falls into the black hole while the other escapes. In order to preserve total energy, the particle that fell into the...

Hawking Radiation and the Negative Energy Particle

Calculus of Variations Natural BC

August 7, 2018, 2:15 pm

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Hi PF!

Given a functional ##J[y]##, if the first variation is $$\delta J[y] = \int_D(ay+y'')y \, dV + \int_{\partial D} (y'+by)y\,dS$$
am I correct to think that when finding stationary points of ##J[y]##, I would solve ##ay+y''=0## on ##D## subject to boundary conditions, which would either...

Calculus of Variations Natural BC

Radially falling into a Black Hole

August 7, 2018, 2:41 pm

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Hi, I have the following problem:

Given the 5-D generalization of the Schwarszschild solution with line element:

[tex]ds^2=-\Bigg(1-\frac{r^2_+}{r^2}\Bigg)dt^2+\Bigg(1-\frac{r^2_+}{r^2}\Bigg)^{-1}dr^2+r^2[d\chi^2+\sin^2(\chi)(d\theta^2+\sin^2(\theta)d\phi^2)][/tex]

where ##r_+## is a positive...

Radially falling into a Black Hole

Physics textbook with lots of medicine-related examples.

August 7, 2018, 3:15 pm

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Hello everyone,

So, I'm about to start a medical degree and one of the core courses involves Physics with a very heavy focus on medicine-related coursework. There isn't a core textbook as of yet but I'm trying to find a textbook that is primarily focused on the basics of Physics (mostly,...

Physics textbook with lots of medicine-related examples.

High-Power Switching using MOSFETs

August 7, 2018, 3:20 pm

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For a project, I need a means of switching a high-current circuit between two inductors. The purpose is, each inductor serves as an electromagnet, and they are switched every 15s or so in order for one of the two to cool before starting again. The system I've designed uses arduino as a...

High-Power Switching using MOSFETs

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Symmetric bowl associated with a line element

August 7, 2018, 3:55 pm

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Hi! I have the following problem I don't really know where to start from:

A bowl with axial symmetry is built in flat Euclidean space ##R^3##, and has a radial profile giveb by ##z(r)##, where ##z## is the axis of symmetry and ##r## is the radial distance from the axis. What radial profile...

Symmetric bowl associated with a line element

Is Earths' potential of 0 volts valid throught the Universe?

August 7, 2018, 3:57 pm

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We have set the Earths' Voltage at zero volts but is this 'earth voltage' applicable throughout the Universe. If not, is it relative in the same manner as spacetime and is it calculatable?

Relative simultaneity

August 7, 2018, 4:05 pm

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Imagine you are in the center of a ship moving at V to the right relative to earth. You have a flashlight in your hand and two perfect reflectors on each end of the ship. If you turn on the flashlight will you observe the reflected light from both ends to hit you simultaneously? What will...

Relative simultaneity

Why Bohmian Mechanics needs non-locality?

August 7, 2018, 4:07 pm

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I always think about entanglement as pure conservation of energy and conservation of angular momentum. In fact I see that only conservation of energy is non-local, and that quantum objects have nothing to do with non-locality, for example you can entangle 2 atoms that have never interacted with...

Why Bohmian Mechanics needs non-locality?

Quantum Locking and the Earth's Magnetic Field

August 7, 2018, 4:27 pm

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Don't know if this is the right place to post this, but it seemed like the best place to start.
I'm wondering how much stronger would the earths magnetic field need to be in order to make quantum levitation using earths magnetic field alone a possibility.
Bonus: Effects the change...

Quantum Locking and the Earth's Magnetic Field