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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 15084 letters have been answered.



List of most recent 15 letters

Title

Subject

Section

Country

Energy from light colors Physics USA
 
Density of pieces of an object Physics Matter Zambia
 
Names of poles Physics Magnetism Nepal
 
What happens to the needle of the galvanometer? Physics Magnetism South Africa
 
I want to know about Physics Physics Nigeria
 
How does ideal gas differ from real gas? Physics Static Electricity South Africa
 
Questions direction of friction force Physics Friction USA
 
I want to discontinue selling through Amazon Advantage Publishing USA
 
Was some of Nixon's speech not published? History USA
 
Suggested animal health resource Animal Health USA
 
Confusion about direction of electron motion Physics Electricity Tonga
 
Suggested resource Publishing USA
 
Do scientists believe in God? Religion Ghana
 
Azeotropic Chemistry Australia
 
What causes lightining to spark? Physics Static Electricity Lesotho
 

Next 15 letters


Energy from light colors

Physics

July 29, 2015

Question

What radiates more energy between deep red and orange, and why?

Banele - USA (26230)

Answer

The shorter the wavelength, the higher the energy. Colors go from long wavelength to shorter as ROY G BIV. Thus the wavelength of orange is shorter than red, and thus orange radiates greater energy.

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Density of pieces of an object

Physics

July 28, 2015

Question

A stone of mass 24g and density 2.5g/cm3 is split into two piece of mass 18g and 6g respectively. What is the density of the smaller piece?
A.0.8g/cm3
B. 1.3g/cm3
C. 2.5g/cm3
D. 4.0g/cm3

Pharon - Zambia (26226)

Answer

The density of an object is its mass divided by its volume. If you just divide the object into pieces, each piece would retain the original density. Thus, the smaller piece would have a density of 2.5 (C).

You can find the volume of a piece by dividing its mass by its density. For example, the volume of the 18g piece would be 18/2.5 = 7.2 cm^3.

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Names of poles

Physics

July 28, 2015

Question

Nagative is called which poll and posative is called which poll?

Zidan - Nepal (26227)

Answer

The poles on a magnet are named north-seeking and south-seeking. Usually people just say north and south.

The poles on a battery are positive (+) and negative (-).

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What happens to the needle of the galvanometer?

Physics

July 26, 2015

Question

describe what happens to the needle of the galvanometer when the magnet is not moving

Phindile - South Africa (26224)

Answer

A galvanometer measures the current through a wire by turning the wire coil between two magnets, thus moving the needle. There may be a type of galvanometer where the magnet turns when current flows through the wire, but it is not a common form.

In either way, no movement of the needle means no current is flowing

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I want to know about Physics

Physics

July 24, 2015

Question

i just want to knw about physis

quadri - Nigeria (26187)

Answer

You can go through the various lessons on Physics to learn the basics of the subject. If you are taking a class, you can pick specific topics.

Best wishes in your studies.

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How does ideal gas differ from real gas?

Physics

July 24, 2015

Question

What is an ideal gas how does it differ from the real gas and why is it necessary to study the ideal gas equation and its properties

sidanga - South Africa (26188)

Answer

An ideal gas is a simplified version of a real or actual gas. It considers the atoms or molecules as small, hard spheres. Also, collision are elastic and all motion is frictionless.

This provides a good approximation of the behavior of a real gas, except that at lower temperatures and higher pressures, many ideal gas equations do not hold.

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Questions direction of friction force

Physics

July 24, 2015

Question

Subject: Friction resists sliding vs. Friction resists rotation

I think, a torque to drive the wheel and a pushing to pull the wheel has the same effect on the wheel. But the directions of two frictions are in opposite directions in your derivation.

I got the same results as you did. but I think somehow it is not correct. Because you can not tell which wheel is driven by a torque or a pull when you have many wheels in a train. If you say the friction resistors for some wheels are in one direction while for some other wheels are in opposite direction. We may have a problem.

Thanks

Jack - USA (26190)

Answer

Thanks for your comments. I added some material to Role of Friction in Starting Rolling Motion to help clarify things.

The indicated friction is static friction resisting the rotation or spinning of the wheel. Combined with the force from the torque results in the force moving the wheel forward.

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I want to discontinue selling through Amazon Advantage

Publishing

July 22, 2015

Question

I want to discontinue sales of a book through Amazon Advantage. The book is out of print and I will not be printing more copies. I just received an order to a few copies of the book from Amazon. How do I reject or cancel a small order that I just received but can't fulfill how do I remove the book from Amazon's list?

Scott - USA (26186)

Answer

It doesn't look easy to get out of the program. If you log into your account at Amazon Advantage, and click on Membership Agreement on the left menu, it states: "b. Termination by you. You may terminate this Agreement at any time, with or without cause, by giving us written notice of such termination. Your termination is effective 30 days from the date we receive your written notice. You must continue to accept, confirm, and fulfill all orders that we send to you prior to the effective date of termination."

That doesn't sound too friendly.

Also click on Help on the top menu and then click on Managing Your Account, you can find information about making adjustments.

I don't use the service anymore, because selling books on consignment isn't worthwhile.

Best wishes on getting things resolved.

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Was some of Nixon's speech not published?

History

July 21, 2015

Question

Maybe I am stupid, but I cannot understand why half of Nixon's resignation speech, where he criticized the other party and the government, was not published. Cannot anyone else take any criticism? He said he just did that to try to change highest level crimes shrouded in secrecy.

Barbara - USA (26183)

Answer

I've looked at Nixon's resignation speech from several sources and didn't see anything about criticizing the other party or the government. In fact, I don't believe the news media would omit such statements, considering their views toward him at that time.

Where did you see that half of Nixon's speech was omitted?

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Suggested animal health resource

AnimalHealth

July 21, 2015

Question

Hello,
I was browsing your website and noticed you have a curated list of resources here: http://www.school-for-champions.com/animalhealth/resources.htm
I found two other resources you can include on your list.
http://bebusinessed.com/resource-guides/cat/
http://www.treehouseanimals.org/site/DocServer/catcareguide.pdf
Both of these are basic guides BUT they helped us when our family received a 9 week old kitten from our neighbor. So I think other beginners would find these guides useful as well. You should check it out, and if you like it, you probably want to switch the links.
I know you are busy and probably get millions of emails a day, but I hope this one was helpful.
Cheers,

Sandra - USA (26184)

Answer

Thanks for the suggested resources. I added them to Animal Health Resources.

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Confusion about direction of electron motion

Physics

July 21, 2015

Question

correct me if I got it wrong electrons moves from negative to positive terminal while the current moves from positive to negative direction which is a new convention in that time and you said this was well before the discoveries of electrons.
honestly it is very confusing why don't the new invention of electrons overwrite the old convention

- Tonga (26185)

Answer

The official designation of the direction of electrical current is from positive (+) to negative (-). However, since electrons have a negative charge, they are really moving in the opposite direction, going toward the positive terminal.

This can be very confusing, and I agree that some other designation should be used. Unfortunately, since (+) and (-) have been used for such a long time, I don't think they will ever change it. Thus, you'll just have to remember that the electrons move in the opposite direction of the current.

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Suggested resource

Publishing

July 20, 2015

Question

Hello
 
First off, I want to compliment you on an outstanding site! It’s really impressive how you're helping writers.

I was perusing your site and found your resource list here: http://www.school-for-champions.com/publishing/resources.htm#.Va0iWPkYOYc
 
My name is James Rose and I’m writing because we’d love to offer our services to your readers. At our site, InstantPublisher.com, we have been helping authors self-publish for the past 15 years.

Please check out our site and if you think we could be of service to your readers, we would be honored to be included on your site.
 
Thank you for your consideration and please contact me for any questions.
 
Best Regards

James - USA (26181)

Answer

Thanks for the resource. I added your company to Self-Publishing Resources.

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Do scientists believe in God?

Religion

July 20, 2015

Question

Do scientists believe in God or not?

Abubakar - Ghana (26182)

Answer

Many scientists from all religions believe in God or some form of Supreme Being.

However, there are scientists that only accept facts that can be proven through experiments. Those people usually do not believe in God or things spiritual, since they cannot be directly proven and simply require faith.

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Azeotropic

Chemistry

July 16, 2015

Question

Can 80% Propane be bonded with 20% Ethane to be fused together to be near azeotropic

Charles - Australia (26176)

Answer

I'm sorry, but I don't have that information.

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What causes lightining to spark?

Physics

July 15, 2015

Question

What courses lightining to spark?

Holder - Lesotho (26170)

Answer

Lightning is caused by a large number of electrons jumping from a cloud to another cloud or some object on the ground. It is like an explosion of electrons. When the electron rush through the air, they excite the air molecules and heat up the air in their path. The air gets so hot that it glows and gives off light. It also expands due to the heat.

But this happens only for a very short time. Once the electrons stop flowing, the air suddenly cools off and collapses, causing the noise of thunder.

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