Key words: Feedback Blog, answers to reader's questions, information, assistance, Ron Kurtus, School for Champions. Copyright © Restrictions
Each day readers send in questions and feedback concerning the various lessons in the School for Champions website. A total of 14784 letters have been answered.
|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|
|What are photons?||Physics||USA|
|Why write up project material?||Technical Writing||Tanzania|
|What is biochemistry?||Chemistry||Tanzania|
|Invented a gravitational engine||Physics||India|
|Metal with same density as liquid||Physics||India|
|What does politics mean?||School for Champions||Nigeria|
|How to use waterless cookware?||Health||USA|
|Turning in office stealer||Character||USA|
|Lever at an angle||Machines||India|
|Show electrostatic charging by induction||Physics||Pakistan|
Need help in starting speaking school
November 22, 2014
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.
Emmanuel - Zambia (25582)
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.
Condominium owners making noise
November 20, 2014
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)
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.
Calculating weight of Earth twin
November 20, 2014
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?
Richard - USA (25571)
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.
Demonstration with Van de Graaff generator
November 19, 2014
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)
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.
Meaning of gravity constant "g"
November 19, 2014
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)
"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.
What are photons?
November 18, 2014
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)
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.
Why write up project material?
November 18, 2014
Why project writeup?
hamisa - Tanzania (25557)
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.
What is biochemistry?
November 17, 2014
WHAT IS BIOCHEMISTRY
PETRO - Tanzania (25551)
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.
Invented a gravitational engine
November 17, 2014
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)
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.
Metal with same density as liquid
November 16, 2014
A metal piece having density equal to density of fluid is placed to the liquid . the metal piece will? a) Sink to bottom b) fload c) partly immersed d) wholly immersed
SHIKANDAR - India (25546)
If it has the same density as the liquid, the piece of metal be completely immersed in the liquid but will not sink to the bottom.
What does politics mean?
November 16, 2014
What do you understand by the term 'Politics'? Do you agree that there is a Science of Politics?
Dennis - Nigeria (25547)
Politics usually concerns governing communities, states, and nations. It also concerns the distribution of power and resources. It is also used in organizations, where it is called "office politics" and involves making decisions about personnel.
The science of politics is covered under Political Science, which is a discipline concerned with the study of the state, nation, government, and policies of the government. To an extent it is a science where there are theories and rules.
I have been planning on adding a section on Political Science in the website.
How to use waterless cookware?
November 16, 2014
I had a set of Seal O Matic waterless cookware passed down to me but it didn't have the directions on how to cook in it and my aunt now has dementia.I know it was bought late 70,s because I was there and not out of school when she bought it at a home party and asked then if I could always have it and now I do but with the price of the set I don't want to mess any of it up by doing something wrong.If you can help me in any way I would greatly appreciate information you can give me to help me cook in it and be able to keep passing it down in the family.
Thanks ahead for your help,
Cindy - USA (25549)
Take a look at Waterless Cookware by Kitchen Craft, which used to make Seal-O-Matic. The site can give some basic information. Any waterless cookware recipe book can also give you guidance.
Best wishes with your cookware set.
Turning in office stealer
November 15, 2014
How can you convince a fellow worker to turn in our office stealer,
who he knows all about ?
Dennis - USA (25545)
That is difficult, especially if the crook is a friend of your fellow worker. Even if the person is not a friend, it is tough to do, because the crook may try to get revenge.
There are two possible routes to take. One is to leave an anonymous note, warning the person to immediately stop stealing or the authorities will be notified.
Another one is to try to catch him in the act. That may be harder to do, but once a person is caught, he usually will stop the stealing. (Or maybe be more careful).
At a job I had, someone was stealing lunches from the department refrigerator. Finally, a worker caught a manager eating his lunch. The manager apologized and never did it again. We all heard about it and had a lower view of this guy after that.
Anyway, I hope you are able to stop this crook from stealing.
Let me know how things work out.
Lever at an angle
November 14, 2014
If fulcrum is at centre and both arms of load and effort are equal, but the arm of effort makes an angle 120 degree with the arm of load
Whether forces of load and effort are equal or not.
Jagdish - India (25534)
There are many facts that need to be clearly stated.
I assume the lever is a straight board. If it is bent at 120 degrees, and the distances from the fulcrum to the load and effort are still equal, the forces will still be equal.
Show electrostatic charging by induction
November 13, 2014
Describe simple experiment to show electrostatic charging by induction?
ali - Pakistan (25529)
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