Weekly Feedback Blog
Each day readers send in questions and feedback concerning the various lessons in the School for Champions website. A total of 12416 letters have been answered.
Although you can access the questions and feedback from the specific lessons, this blog is a listing of 11 letters answered during the week from today (9/2/10) to 7 days ago (8/26/10).
You can also select another week to view.
List of letters
Date |
Title(Click to jump to item) |
Subject |
Topic |
| 8/26/10 | Why doesn't a broken magnet reassemble? | Physics | Magnetic Detection |
| 8/26/10 | Did JFK read several James Bond books? | History | Kennedy and James Bond |
| 8/27/10 | Why are poles not on the surface? | Physics | Magnetism |
| 8/27/10 | Has solid experiment | Science Experiment | Matter States |
| 8/28/10 | Which attracts more strongly, a magnet or iron | Physics | Electromagnetism |
| 8/29/10 | Why doesn't a glass of water show a rainbow? | Physics | Dispersion of Light |
| 8/29/10 | How we can know the static charge produced? | Physics | Basics of Static Electricity |
| 8/30/10 | Will the SfC have an iPhone app? | Physics | General |
| 8/30/10 | What is friction and wear rate? | Physics | Friction Causes |
| 8/30/10 | Worried that he will die before he is 21 | Religion | Life After Death |
| 8/31/10 | Disagree that temperature has an upper limit | Physics | Temperature |
You can also select another week to view.
Details of letters
Physics - Magnetic Detection
Why doesn't a broken magnet reassemble?
August 26, 2010
Question
Why does the bar magnet if broken ,does not reassemble in the same order/design ?
Arpit - INDIA (20297)
Answer
If you cut or break a bar magnet in two, you will get two magnets. When you put them together, they will hold only with the strength of the magnet. Breaking the material requires more force than the magnetic force, and does the object will only be loosely together.
If you break the magnet into many pieces, you will have more difficulty reassembling it.
History - Kennedy and James Bond
Did JFK read several James Bond books?
August 26, 2010
Question
Your article says JFK read a few of the Bond books, yet from previous research I learned what gave Fleming's series its biggest boost was in March 1961 when JFK released a list of his favorite books and FROM RUSSIA WITH LOVE was one of them. It was the only work of fiction on that list.
Adrienne - USA (20300)
Answer
It is true that the Life Magazine article where JFK listed "From Russia with Love" initiated the American popularity of the James Bond series, there are other sources that indicate he read several other Bond books.
The Kennedy Library website states that JFK and the Director of the CIA Allen Dulles often would talk about various Bond books:
http://www.jfklibrary.org/Historical+Resources/Archives/Reference+Desk/John+F.+Kennedy+Miscellaneous+Information.htm
Also http://www.aboutfamouspeople.com/article1126.html states that Kennedy was a big fan of James Bond and read all of Ian Fleming's books.
Physics - Magnetism
Why are poles not on the surface?
August 27, 2010
Question
why north & south poles are held slightly inside in the magnets?
rahul - India (20303)
Answer
There has to be at least a layer of atoms that are properly aligned in order for the magnetic flux lines to go out from the magnet.
Science Experiment - Matter States
Has solid experiment
August 27, 2010
Question
i would like to show you a solid experiment to you.
Grace - Australia (20304)
Answer
Feel free to send information about your experiment.
Physics - Electromagnetism
Which attracts more strongly, a magnet or iron
August 28, 2010
Question
Which attracts more strongly - the magnet the iron or the iron the magnet and why?
Soumya - India (20305)
Answer
Since a magnet already has its atoms aligned, such that it creates a magnetic field, it attracts the iron toward it, as it aligns the atoms in the iron.
However, the force between them is the same in both directions.
Physics - Dispersion of Light
Why doesn't a glass of water show a rainbow?
August 29, 2010
Question
Why do we not see a rainbow if we shine light on a glass of water? Does dispersion not happen then?
Pankaj - India (20307)
Answer
If you shine a light from a point source for very small stores through a glass of water, you will see a slight rainbow at the edges of the image.
The way a rainbow works is that there are many small droplets of water that caused the dispersion of the light into its spectrum. The light reflex inside the droplet and returns in the opposite direction.
When you face a rainbow, the water droplets are in the sky in front of you and the Sun is always at your back.
Physics - Basics of Static Electricity
How we can know the static charge produced?
August 29, 2010
Question
i have a question to ask regarding static electricity.
how we can know the charge produced on the surface when rubbed is positive or negative?
otherwise the explanation is clear enough for anybody to understand.saransh - India (20308)
Answer
whether a material will have a positive or negative charge on its surface depends on its atomic structure and what material is rubbed against it.
See "Materials that Cause Static Electricity" at:
http://www.school-for-champions.com/science/static_materials.htm
That lesson gives a list of materials that either gain a positive or negative charge. For example, wool is listed as gathering a positive charge when it is rubbed with polyester, which gathers a negative charge.
Physics - General
Will the SfC have an iPhone app?
August 30, 2010
Question
Not sure if this is a first or not but I was wondering if SFC will have a iPhone app?
Jeremy - USA (20310)
Answer
I hadn't thought about it, but having an iPhone app is an interesting idea. We'll look into it.
Physics - Friction Causes
What is friction and wear rate?
August 30, 2010
Question
what is friction,coefficient of friction,frictional force,frictional resistance & wear rate.how COF & wear rate or wt loss effected by roughness,smoothness & brittleness?
mayuri - India (20312)
Answer
Most of your questions are answered in our friction lessons. However, we do not have an information about wear rate.
Religion - Life After Death
Worried that he will die before he is 21
August 30, 2010
Question
i have a question what i was thought that we die and never come back until god returns im just worried that im gonna die before i turn 21 i hope not i just need some comfort email me back please and confort me thank you
jordan - USA (20313)
Answer
If you take care of yourself and don't do anything foolish, you should live well beyond 21 years. But also, you want to take advantage of this opportunity of life so that you live an enjoyable and worth while existence.
Enough people believe that there is some sort of existence after physical death that there may be something to it. Most religions believe that there is a life after death.
Live a good life and a useful life, and things will work out for the best.
Physics - Temperature
Disagree that temperature has an upper limit
August 31, 2010
Question
I would question your statement that temperature has an upper limit. Although there is an upper limit to velocity, there is no upper limit to energy which is what temperature is proportional to.
todd - USA (20316)
Answer
There is a upper limit to the energy of an object, defined by Einstein's equation E = mc^2. At extremely high temperatures, the velocity of particles approach the speed of light, and their kinetic energy KE = mv^2/s approaches the limit of E = mc^2.
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