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Feedback Blog

Each day readers send in questions and feedback concerning the various lessons in the School for Champions website. A total of 14790 letters have been answered.



List of most recent 15 letters

Title

Subject

Country

Colleges offering PhD in Electro-Optics ElectroOptics USA
 
Questions continuing space weapons research SDI USA
 
Speed of electron flow through in DC current Physics Pakistan
 
Need help in starting speaking school Speaking Zambia
 
Condominium owners making noise School for Champions Malaysia
 
Calculating weight of Earth twin Physics USA
 
Demonstration with Van de Graaff generator Physics USA
 
Meaning of gravity constant "g" Physics Pakistan
 
Compare three phase of marketing Marketing Nigeria
 
What are photons? Physics USA
 
Why write up project material? Technical Writing Tanzania
 
You've created an incredible resource for students Thanks USA
 
What is biochemistry? Chemistry Tanzania
 
Invented a gravitational engine Physics India
 
Explain electromagnetic induction Physics Cameroon
 

Next 15 letters


Colleges offering PhD in Electro-Optics

ElectroOptics

November 23, 2014

Question

To whom it concerns
First and foremost, what you explained was really helpful to me. I have been trying to find the PhD programs in electro-optics in the US; however, I have not been successful detecting them. I got to find just a few of them. I need help in finding universities or institutes where I can attend PhD program in electro-optics. It is also good to note that I have a bachelor's degree in physics

Ramin - USA (25583)

Answer

Some U.S. schools that offer advanced degrees in Electro-Optics include:

University of Dayton (Ohio) Electro-Optical Graduate Program and University of Rochester (NY) Institute of Optics.

I hope that helps. Best wishes in gaining your PhD.

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Questions continuing space weapons research

SDI

November 23, 2014

Question

Two ideas regarding SDI I find of interest are:

1) “A major problem with pursuing the concept was that such an anti-missile defense in space was against existing treaties we had signed. It was possible to do research, but we could not actually test or employ the devices in space.”

2) “Since there was no longer a reason for SDI, Congress cancelled the program in the early 90s. Air Force then changed the name of the program and continued its research. The press never followed up on this and moved on to other issues.”

To continue doing SDI research, it must have become necessary to use (a) research site(s) other than “space” in which to test and employ the x-ray laser and other than space missiles/craft as targets.

With Air Force’s changing the name of the program and continuing its research without follow-up by the press, it is doubtful whether Federal regulation of research, which could have involved human and/or other living creatures as research subjects, was adhered to in research undertaken by Air Force.

Victoria - USA (25585)

Answer

The Ballistic Defense Missile System apparently has congressional, as well as NATO support. The Missile Defense Agency website is a good source for information.

As far as the press goes, they often lose interest in issues and programs and move on to other things they feel are newsworthy.

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Speed of electron flow through in DC current

Physics

November 22, 2014

Question

in which speed electron flow through in Dc current

amjad - Pakistan (25578)

Answer

The speed of an electron in a DC circuit is also called the electron drift velocity. Electricity passing through a copper wire of radius 1 mm, carrying a steady current of 10 amps, has a drift velocity of only about 0.024 cm/sec.

It surprises many scientists how slow they travel in a wire. However, the effect of that movement causes the electricity to travel close to the speed of light, because of the movement of the electromagnetic field.

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Need help in starting speaking school

Speaking

November 22, 2014

Question

Kindly note that I have just checked the site for Zambia Toastmasters Club. I am sorry it cant meet our needs.Your School of Champions, route could be the best for us. Please see how you assist.
Thanks

Emmanuel - Zambia (25582)

Answer

The School for Champions website gives some basic information on improving in public speaking. However, in order to improve people need to practice their speaking in front of live audiences.

f you want to start up a public speaking school, I do recommend looking into Toastmasters. If you look through the Zambia Toastmaster website, you will find free resources on public speaking, including online versions of the Toastmaster Magazine. Also, Toastmasters International has material that show how to start a club or school

It is worthwhile to research before organizing your public speaking school. Best wishes with your efforts.

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Condominium owners making noise

School for Champions

November 20, 2014

Question

Hi, firstly thank you for reading my question. I will try to be as brief as possible.
I am a Security head in a 5 star condominium. We often get complains of sound coming from other units. In this particular case, its been going on for over 3 years now. The unit on the 12th floor is disturbed frequently by sounds which are believed to be coming from the unit above (13th Floor) sounds are usually squeaky like a chair or table is pulled.
I have experienced similar cases previously which turned out to be imagination but in this case it is not because more than 3 people have testified hearing these disturbing sounds.
However, the unit above has denied producing these sounds. Even the local Police paid a visit to the unit above and they strictly denied.
I really want to solve this issue and want to kinda gather evidence that the sounds are indeed coming from the unit above by recording ect. My question is is there anyway I can absolutely prove where the sounds are coming from? Pls help. Thank you.

Jamal - Malaysia (25570)

Answer

I am sure that the people in the unit on the 13th floor are not making the noises on purpose or even realize what they do annoys those living below them.

Instead of accusing them of making noise, perhaps you can ask them for help in finding the source of the noise. They may have a rocking chair that causes squeaks. They also may dragging a table or chair to move it. Those problems can be solved such things as small sliders on the chair. Also, carpeting in the unit could prevent the noises.

If dealt with in a friendly manner, I am sure they will cooperate. No one wants trouble in their home.

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Calculating weight of Earth twin

Physics

November 20, 2014

Question

I tried to calculate the weight of the earth in pounds using your method of calculation given at URL school-for-champions.com/science/gravitation_force_objects.htm but I appear to be getting the wrong answer. Could you tell me why?

I assumed there was a second earth. To weigh it, I assumed the thickness of my weight scale was zero meters so that the earth I was weighing was located touching my earth to make the distance between their mass centers equal to 2 x earth radius = 12742 km = 1.2742 X 10^7 meters.

Using your formula F = GMm/R^2 and letting M = m = 5.972 X 10^24 kg I compute a force F = 1.466 X 10^25 Newtons. This is the gravitational force applied to my weight scale. Computing the pound-force = 0.22481 X F Newtons, I have the weight of the earth equal 3.296 X 10^24 pounds.

This does NOT equal the weight of the earth converted from its known mass of 5.972 X 10^24 kg in the metric (or SI) units system. What am I doing wrong or what are you doing wrong at your referenced URL?

Sincerely yours,

Richard - USA (25571)

Answer

Using a twin Earth to measure its weight is an interesting exercise.

Since you already have its mass (m = 5.972 X 10^24 kg) you can simply multiply it by 9.8 m/s^2 to convert the mass to newtons and then multiply by 0.225 to get the weight in pounds.

The problem with using the equation F = GMm/R^2 to determine the force (and thus the weight) between the Earth and its twin has to do with the constraints on the equation, such that it is an approximation.

F = GMm/R^2 defines the force between two point masses at some distance. If the objects have some size, the distance between the centers must be very large compared to their size. In the case of the Earth and its twin in contact, the equation really doesn't hold, because you have to integrate the attraction over both surfaces. The math can be complex.

I went through the math and got the same answers as you did. However, it is surprising that the difference in weights is so great for this case.

See Universal Gravitation Equation for an explanation and illustration.

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Demonstration with Van de Graaff generator

Physics

November 19, 2014

Question

my company wishes to use a vdg generator at a show booth. the concern is that it will damage electronic devices cell phone computers etc. is there a safe wattage for this thanks

robert - USA (25562)

Answer

The article Van de Graaff Generator Safety recommends keeping electronic devices 20 feet away. However, they may be extra cautious in that number.

More importantly, they advise not connecting computers, etc. to the same circuit as the generator.

I hope that helps. Best wishes with your demonstration.

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Meaning of gravity constant "g"

Physics

November 19, 2014

Question

My question is about physical meaning og g=9.8 value.
Does it mean that an object having initial velocity as zero will cover a 9.8 meter distance in 1 second, falling under gravity near earth?
If yes then what if initial velocity of an object is not zero? Let say it 5 m/s then how much distance it will cover in 1 second falling under gravity?

Naveed - Pakistan (25563)

Answer

"g" represents the acceleration of an object due to the force of gravity. g = 9.8 meters per second squared. It is correct that a dropped object will fall 9.8 meters in one second. The equation for distance with respect to time is y = (gt^2)/2. Thus y = 9.8*2*2/2 = 18.6 meters. See Gravity Displacement Equations for Falling Objects for more information.

If the initial velocity is not zero, it depends whether the object was thrown up or down. See Objects Projected Downward and Objects Projected Upward.

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Compare three phase of marketing

Marketing

November 19, 2014

Question

Compare and contrast the three (3) phases of marketing.

PrestigiouzzZ - Nigeria (25565)

Answer

Each phase in marketing should be done in the order given. They are all important to get to selling the products.

To effectively pursue the goal of selling your product, you need to first define your circumstances, such as what your core business is and who your customers are. Then you must make preparations for getting your customers to buy your product. Preparations include getting an appealing product, setting a good price and providing a place for them to buy.

Finally, you go into action, trying to reach your customers, letting them know about your product and telling how good it is. Once you can get them in the showroom, you can convince them to buy.

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What are photons?

Physics

November 18, 2014

Question

Hello, reading this article helped understand electromagnetism a lot, but I am still left wondering on where and how photons ties into electromagnetism, if you can give me brief explanation it will be incredibly helpful to me to understand what’s being taught in my class.

- USA (25556)

Answer

Electromagnetism ties in electricity and magnetism. However, then they oscillate, the combination of electrical and magnetic waves result in electromagnetic waves, such as light, radio, etc. See Overview of Electromagnetic Waves

In some situations, electromagnetic waves behave as particles called photons. This is part of what is called the wave-particle duality. Likewise electron particles can behave as waves.

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Why write up project material?

Technical Writing

November 18, 2014

Question

Why project writeup?

hamisa - Tanzania (25557)

Answer

It is important to write out your plans for a project. This makes sure your efforts are logical and that you do not miss any important points.

Also, writing things out allows others to review and understand the concepts.

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You've created an incredible resource for students

Thanks

November 18, 2014

Question

Hi Ron!

I hope this note finds you well. You've created an incredible resource for students here on school-for-champions.com. I'm really impressed & inspired! When people are empowered to learn by websites like yours, they do great things.

To that end, I work on another online resource called Socratic.org, where students can ask questions, do practice problems, & watch videos in a number of math & science subjects.

I thought Socratic would be a valuable resource to share with your students to help further your mission to help others achieve their goals & become champions :) Would you like to include Socratic.org on School for Champions?

If so, feel free to use this link: http://socratic.org/

Let me know what you think,
Becca

PS If you have any questions or would like to learn more about Socratic, please let me know — I’d love to talk math/science/life with you! :)

Becca - USA (25559)

Answer

Thanks for the comments. I added links to your website from:

http://www.school-for-champions.com/grades/resources.htm

http://www.school-for-champions.com/algebra/resources.htm

http://www.school-for-champions.com/chemistry/resources.htm

http://www.school-for-champions.com/science/resources.htm

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What is biochemistry?

Chemistry

November 17, 2014

Question

WHAT IS BIOCHEMISTRY

PETRO - Tanzania (25551)

Answer

Biochemistry is the study of chemical processes having to do with living organisms, such as plants and animals. For example, how food is digested and turned into energy is studied under biochemistry.

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Invented a gravitational engine

Physics

November 17, 2014

Question

I invented an invention gravitational engine now published in Awshkar journal of National Research Development Corporation of India which works without fuel but with gravitational energy and can produce any kind of energy. May you help for patenting or Industrialization?

Jagdish - India (25553)

Answer

In order to get it patented, it is important to build a working model of your invention. Then then may have to work through patent attorneys in India. However, it is possible to apply for a patent in order to get funding for your invention.

You should describe your invention and put together a business plan of how it will be made and sold. This helps others to get involved.

I hope those ideas help. Best wishes in developing your invention.

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Explain electromagnetic induction

Physics

November 17, 2014

Question

Hi my name is Tsakam Yvanna I'm in F5 and my problem is Maths and Physics basically in physics I don't understand motor effect and Electromagnetic Induction. If you had this email please help me because I'm desperate I need this paper to pass my GCE O/Level and I definately have no one to help.Thanks

Tsakam - Cameroon (25554)

Answer

When a metal wire passes through a magnetic field, the Lorentz Force causes electrons in the wire to move. This is the basis of electrical generators.

However, when the wire or a conductor is stationary in a varying magnetic field, electromagnetic induction or electromagnetic force occurs on the wire. That force can cause the wire to move. This is often used in electrical motors.

See the tutorial on Electromagnetic Induction.

I hope that helps with your understanding. Best wishes for success in your studies.

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