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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 14828 letters have been answered.



List of most recent 15 letters

Title

Subject

Country

What is the cause of reaction force? Physics india
 
Why do magnets attract some materials? Physics Pakistan
 
Define bound current Physics Pakistan
 
Your website is priceless Thanks USA
 
Newton's Cradle slows down too fast Physics USA
 
Temperature for ice-steam mixture Physics India
 
I appreciate your article SfC USA
 
Should I can contract with existing publisher? Publishing USA
 
Suggested health resource Health USA
 
Comparing work and torque Physics Pakistan
 
One of the best explanations Thanks India
 
Wants to use a 240 volt generator in Bali Physics Australia
 
Correction on Sergei Sergeyevich Prokofiev History Russia
 
Wants information on ambition Character Indonesia
 
Density and relative density Physics Nigeria
 

Next 15 letters


What is the cause of reaction force?

Physics

December 19, 2014

Question

what Is the exact cause of reaction force? I didnt get simplified and exact answe yet so I am looking forward for answer from you 'cause the previous article I read from this blog helped me alot nd thanks for that
class 10

deepsikha - india (25653)

Answer

According to Newton's third law, for every action force there is an equal (in size) and opposite (in direction) reaction force. Forces always come in pairs - known as "action-reaction force pairs."

Thus, the cause of such a force is due to the law of conservation of energy and momentum.

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Why do magnets attract some materials?

Physics

December 19, 2014

Question

why magnet attract some material? & why it repel some materials?

tanzeela - Pakistan (25654)

Answer

The atoms and their electrons in materials such as Iron and Nickel align themselves to cause the magnetic attraction. Other materials, are not aligned, so they are not attracted.

See Factors Determining Magnetic Properties for for information.

In the case of repulsion, just the opposite occurs. See Classifications of Magnetic Materials for information.

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Define bound current

Physics

December 19, 2014

Question

how can we define bound current???
i've been searched but i didn't get any satisfied result please help me out

tanzeela - Pakistan (25655)

Answer

Magnetization makes a contribution to the electrical current density, known as the magnetization current or bound volume current. But there is also a related surface bound current involved. It gets pretty complex and involves Maxwell's Equations.

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Your website is priceless

Thanks

December 19, 2014

Question

Your website is priceless -- I can't thank you enough for the information you have made available for me and so many folks!
Thank you a million!

JannaV - USA (25656)

Answer

I appreciate your comments. Best wishes for success in all your endeavors.

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Newton's Cradle slows down too fast

Physics

December 18, 2014

Question

Can the Balls be easily fixed so the balls bounce more than a few seconds. You would think 5 minutes or more it should bounce. Mine is new and only bounces a few seconds.

Phil - USA (25652)

Answer

The Newton's Cradle should continue for more than a few seconds, but they do slow down a lot faster than you would like.

If the balls are hard metal and well aligned, the slow-down should be less. But still, there seems to be a fair amount of lost energy. I noticed that my balls do not stay in place after a collision. It looks like the energy and momentum is not perfectly transferred.

I don't know if expensive, scientific versions work any better.

A analysis can be seen at Newton's Cradle Analysis. It probably goes into more detail that you need to know.

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Temperature for ice-steam mixture

Physics

December 17, 2014

Question

1 gm of ice at 0 degree Celsius and 1 gm steam at 100 degree Celsius. find the temperature of mixture??

please explain it.......

abhishek - India (25650)

Answer

The big problem is in measuring the temperature of a mixture of ice and steam. The heat of the steam would start to change the ice to water and the coldness of the ice would change the steam to water.

You would really have to wait until both changed their states to water before getting a real temperature. The average would be close to 50 degrees C.

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I appreciate your article

SfC

December 17, 2014

Question

I really like and appreciate your article. Thanks Again. Will read on...

crokrz - USA (25651)

Answer

I'm glad the material helped you.

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Should I can contract with existing publisher?

Publishing

December 14, 2014

Question

I published a title with Dog Ear Publishing earlier this year, "Crashing Streams of Change" I am now my own publisher and plan to join the Advantage Program to sell my book. Would I need to can my contract with Dog Ear in order to sell my book through the Amazon Advantage Program?

Moulton - USA (25645)

Answer

Right now, your book is listed on Amazon.com as published by Dog Ear Publishing. Probably, they are the publisher-of-record for the ISBN of the book. You may have to get a new ISBN for the book to list yourself as publisher. That may not be worth the trouble.

With any publishing house, the authors often needs to market and sell the books themselves. You could get copies from Dog Ear and sell through the Advantage Program, or you could have the books printed elsewhere and sell through Advantage.

I feel that the best route is to have the book printed and distributed through Amazon's CreateSpace or IngramSpark. In that way, you don't have to have the books shipped to you and then deliver to the buyers.

You might check with Dog Ear to see what is the best route to take.

I hope these ideas help. Best wishes on selling your book.

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Suggested health resource

Health

December 14, 2014

Question

Good Afternoon,

I stumbled across school-for-champions.com , and thought the information provided on your website was very helpful and informative.

I think you will be interested in a resource that I have personally found extremely beneficial. The site mesotheliomahelp.org provides caregivers, patients, and others (including veterans, emergency personnel, firemen, mechanics, homeowners, etc) resources and tools to gain knowledge about a horrible type of lung cancer. Their main mission is to spread awareness for asbestos exposure, which leads to Mesothelioma. It is the only site to feature a live chat option (24/7), annual $10,000 scholarship, Q & A sessions, and much more.

If you would like more information about this site, please let me know. I think that it would be wonderful if you could link to www.mesotheliomahelp.org/asbestos/ and share it with your visitors? I think a great place would be

We really need your help to overcome this deadly disease!

I hope you have a great day.

Kindly,

Robert Padgett

Robert - USA (25646)

Answer

I added a link to your site from Health Resources.

Best wishes for your organization and work.

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Comparing work and torque

Physics

December 13, 2014

Question

if we look the dimension of work and torque is same.so what is the difference?

hamad - Pakistan (25642)

Answer

Although the units of work and torque are the same, the applications are different.

Work equals a force against a resistance times the distance applied. It is assumed that the motion is linear. See Work is a Result of Force.

Torque is a force on an arm that can rotate about some point times the length of the arm. If there is some resistance--such as friction--the torque can equal the work over the distance of the rotation. See Force and Torque.

Unfortunately, the definitions can be confusing.

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One of the best explanations

Thanks

December 12, 2014

Question

It is one of the best explanations about the topic, especially the first example clears all doubt.
Thanks.

- India (25637)

Answer

I am glad the explanation helped you. Best wishes for success in your studies.

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Wants to use a 240 volt generator in Bali

Physics

December 12, 2014

Question

Hello,
We will be moving from Australia to Bali soon and would like to take my trusty generator with us but have a concern with power differences because Australian power is 240v 50hz where as Bali is 220v 50hz.
My generator is 3 phase 415v 50hz with single phase also 240v 50hz, the reason I want to take my generator is because my new Bali house is wired in with 3 phase [415v 50hz] and split to also use single phase [220v 50hz] what my concern is can I run my Ausie genset for emergency power only? I've been told [on the street] that I can as the genset my produce 240v, but the house power will a only use 220v, bit confusing? anyway any advise would be greatly appreciated.
Regards
Barry

Barry - Australia (25638)

Answer

In general, the listed voltage is only an average. Usually, there is a variation of about 10%. That means you can probably use your generator for emergency power. Hopefully, you will not need to, but it is always good to be prepared.

I hope this helps. Best wishes for your life in Bali.

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Correction on Sergei Sergeyevich Prokofiev

History

December 12, 2014

Question

Sorry, but i find mistake-
Sergei Sergeyevich Prokofiev - 23 April 1891 – 5 March 1953)[1] was a Russian composer, pianist and conductor. As the creator of acknowledged masterpieces across numerous musical genres, he is regarded as one of the major composers of the 20th century.
Prokofiev was born in 1891[n 2] in Sontsovka (now Krasne, Krasnoarmiisk Raion, Donetsk Oblast, eastern Ukraine), a remote rural estate in the Yekaterinoslav Governorate of the Russian Empire. His father Sergei Alexeyevich Prokofiev, originally from Moscow, was an agronomist. Prokofiev's mother, Maria (née Zhitkova), came from a family of former serfs who had been owned by the Sheremetev family, under whose patronage serf-children were taught theatre and arts from an early age

http://en.m.wikipedia.org/wiki/Sergei_Prokofiev

Vasily - Russia (25639)

Answer

Thank you for pointing out my error. I corrected the material on Sergei Sergeyevich Prokofiev, especially stating that he was Russian.

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Wants information on ambition

Character

December 12, 2014

Question

Dear Mr/Ms of school for champion

My name is ade denaria, Student of Buddhi University in Indonesia,

I would like to ask your help to explain about ambition, I need that infornation for my Thesis/paper.

Could you please kindly inform about:
1.the meaning of ambition
2.types of ambition
3.cause of ambition
4.positive and negative sides of ambition effect.

Could you please inform me as soon as possibe .. because I need it for my rederences.

Thank you for your attention, looking forward your email

Warmly regards

Ade.D

ade - Indonesia (25640)

Answer

Ambition is a strong desire to do or to achieve something, typically requiring determination and hard work. One type of ambition is internal, where the person wants to do his or her best. Another type of ambition is external, where the person wants to succeed in a competition.

Some people seem to be born with more ambition than others. It seems to be a personality trait. Others are taught to be ambitious and want to achieve things from their parents. It is more of a character trait.

When a person has too much ambition, he or she can become ruthless in achieving goals. However, someone with little ambition can be considered shiftless or lazy.

I hope that helps with your paper.

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Density and relative density

Physics

December 11, 2014

Question

1.It is recommended be made small. Why?
2.Would the value of g be affected if the size of bob is varied?
3. What is relative density and what is density?
4. Name two advantages of relative density over density in measurement.

Abdulhadi - Nigeria (25634)

Answer

The value of the acceleration due to gravity "g" is independent of the mass or size of the object.

Density is the mass of an object divided by its volume. Relative density is the same as specific gravity. It is the density of a material with respect to the density of water.

Relative density has the advantage of being independent of the volume.

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