Speed of sound in steel vs air

August 6, 2018, 5:13 pm

≫ Next: Accelerator radiation protection program

≪ Previous: A Few Stock Dividend Questions

I saw on a web page a video of tiny Agnes Scott College vs Princeton University from 1966 on GE College Bowl.Agnes Scott won (!), but one of the questions that both schools got wrong was
asked by the moderator:
The speed of sound in air is about 1,100 feet/sec. The speed of sound in steel is...

Speed of sound in steel vs air

↧

Accelerator radiation protection program

August 6, 2018, 5:57 pm

≫ Next: Time related plot device question

≪ Previous: Speed of sound in steel vs air

Hi everyone,

I have this question attached from the ABHP exam in part B you are asked to list and justify 4 major elements for accelerator radiation protection program for this specific facility, I have written some answers which are :
1) ALARA which includes :
time
distance
shielding
source...

Accelerator radiation protection program

↧

Time related plot device question

August 6, 2018, 6:04 pm

≫ Next: Remove an Aluminum Tube

≪ Previous: Accelerator radiation protection program

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 plot device question

↧

Remove an Aluminum Tube

August 6, 2018, 6:17 pm

≫ Next: Absorptance versus absorbance

≪ Previous: Time related plot device question

Any ideas on how I would remove an Aluminum drop tube from a gasoline or diesel tank? The tube goes thru a 4" steel pipe that extends 3' to 4' above the tank.

The problem is that after years of being in the tank the aluminum has seized to the steel pipe. I am thinking about trying to melt the...

Remove an Aluminum Tube

↧

Absorptance versus absorbance

August 6, 2018, 6:21 pm

≫ Next: Possible to calculate shear stress from this?

≪ Previous: Remove an Aluminum Tube

I want to know what exactly is the physical significance of absorptance versus absorbance. I have not come across a reference that clearly explains the distinction between the two quantities.

From the definitions:

When light is incident on a material, by finding the fraction that gets...

Absorptance versus absorbance

↧

Possible to calculate shear stress from this?

August 6, 2018, 6:25 pm

≫ Next: How do theoretical physicists work?

≪ Previous: Absorptance versus absorbance

Ok, so I would like to know if something is possible.

I have a bamboo ring, which has been cut in half, and had a peice of fabric soaked in epoxy placed in between to act as a flange.

Under compression, the main failure occurs at the fabric/bamboo connection, as a result of shear stress.

Is...

Possible to calculate shear stress from this?

↧

How do theoretical physicists work?

August 6, 2018, 6:38 pm

≫ Next: Orbital Mechanics in Unity Game Engine for Augmented Reality - Comments

≪ Previous: Possible to calculate shear stress from this?

I always imagine them sitting in their room behind their desks and working on their new theory like Einstein. I suppose most theorists work in groups nowadays to be more efficient but do these lonely workers still exist and are they supported financially or they're working in their free time?

↧

Orbital Mechanics in Unity Game Engine for Augmented Reality - Comments

August 6, 2018, 6:43 pm

≫ Next: Match the Scientist with the Story Quiz - Comments

≪ Previous: How do theoretical physicists work?

Greg Bernhardt submitted a new PF Insights post

Orbital Mechanics in Unity Game Engine for Augmented Reality
View attachment 228926

...

Orbital Mechanics in Unity Game Engine for Augmented Reality - Comments

↧

Match the Scientist with the Story Quiz - Comments

August 6, 2018, 6:56 pm

≫ Next: carrier wave double slit experiment

≪ Previous: Orbital Mechanics in Unity Game Engine for Augmented Reality - Comments

Greg Bernhardt submitted a new PF Insights post

Match the Scientist with the Story
View attachment 228664

...

Match the Scientist with the Story Quiz - Comments

↧

carrier wave double slit experiment

August 6, 2018, 7:11 pm

≫ Next: Relationship : 2=-2

≪ Previous: Match the Scientist with the Story Quiz - Comments

If you created the following double slit experiment would you still see interference?

1) Modify the slits so that the path from photon source through one of the slits to the detector is much shorter than the path through the other slit.
2) put a shutter in front of the photon source so that you...

carrier wave double slit experiment

↧

Relationship : 2=-2

August 6, 2018, 7:13 pm

≫ Next: Capacitor connected to battery at one end

≪ Previous: carrier wave double slit experiment

Does this relationship come out anywhere interesting in math? Are there any anything interesting theories built with this at its foundations?
$$2=2*1=2*\sqrt{1}=2*\sqrt{(-1*-1)}=2*i*i=2*i^2=-2$$

↧

Capacitor connected to battery at one end

August 6, 2018, 7:53 pm

≫ Next: Can't decide between Electrical Engineering and Physics?

≪ Previous: Relationship : 2=-2

I was recently solving a problem that involved a circuit with a capacitor that was connected to a battery at one end(the second plate just had a wire which didnt lead anywhere).

In the solutions it said that this capacitor cannot have any charge since there is no path for the current to flow,...

Capacitor connected to battery at one end

↧

Can't decide between Electrical Engineering and Physics?

August 6, 2018, 7:58 pm

≫ Next: flow of charge between two spheres

≪ Previous: Capacitor connected to battery at one end

I comprehend that the above statement is not phrased as a question even though it contains the appropriate symbol, and that is because even if it was, and an appropriate answer was given, i believe i still would not be able to make a decision. It is more a reflection of my current mental state,...

Can't decide between Electrical Engineering and Physics?

↧

flow of charge between two spheres

August 6, 2018, 8:22 pm

≫ Next: Difference between color / temperature?

≪ Previous: Can't decide between Electrical Engineering and Physics?

Lets say I have two spheres of equal dimensions, one charged and one uncharged. Now I connect them with a conducting wire. They will now very quickly reach equal potential. Can it be said that the total charge on each sphere remains almost unchanged?

↧

Difference between color / temperature?

August 6, 2018, 8:32 pm

≫ Next: A few questions about Evolution

≪ Previous: flow of charge between two spheres

What is the difference between a red object at room temperature and a heated red object (Metal for example).

They are both red except one is cooler then the other?

Why aren't the red objects in my room not hot like the heating of a metal?

↧

A few questions about Evolution

August 6, 2018, 8:48 pm

≫ Next: Quantum Mechanics, What is it exactly?

≪ Previous: Difference between color / temperature?

Hi, I'm not a biologist and I'm not studying biology. But I'm curious so I read and watch some popular papers or videos. I have a question but first of all, I would like to conclude what I think is true:

a) The evolution is a process of adapting of living to live in some environment.

b) The...

A few questions about Evolution

↧

Quantum Mechanics, What is it exactly?

August 6, 2018, 8:56 pm

≫ Next: Uh ... where's the "rules" link?

≪ Previous: A few questions about Evolution

I recently watched a video where Sean Carroll talked about QM and multiverses

1/ Could you please explain:

Where does all the energy come from to drive all these universes.
Surely this must take an enormous amount of energy to drive a multiverse
system (infinite).

Does each universe...

Quantum Mechanics, What is it exactly?

↧

Uh ... where's the "rules" link?

August 6, 2018, 9:02 pm

≫ Next: Soil-Structure Interaction

≪ Previous: Quantum Mechanics, What is it exactly?

I was going to point someone to the rules but can't find them. The "info" dropdown selection just opens the main page of PF

View attachment 228932

↧

Soil-Structure Interaction

August 6, 2018, 9:10 pm

≫ Next: Print correct value of Real number with gfortran?

≪ Previous: Uh ... where's the "rules" link?

Stiff soil like tuff rock is said to be in resonance with short storey buildings (like 2 to 3 storey).. meaning during seismic movement the response in the short storey buildings would be greater. Is there any formula that can relate the two... like does stiff soil has the same frequency as...

Soil-Structure Interaction

↧