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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 15676 letters have been answered. They are listed according to date.

You can read them to further your understanding of the subjects.



List of most recent 15 letters

Title

Subject

Section

Country

Recommending mesothelioma resource Health USA
 
Weight of two containers of water Physics Fluids Egypt
 
Calculating speed of light for spectral line Physics Ireland
 
Replacement lids for Mastercraft waterless cooker Health USA
 
Gas pressure on .5 square inch area Physics Pakistan
 
More electrons than protons Physics Static Electricity Phillippines
 
Silk and static electricity Static Electricity USA
 
Paperback spine labeling Fiction USA
 
Convert mega Hz to peta Hz Waves Nigeria
 
Suggested resource Finances USA
 
Efficiency of a screw jack Machines Ghana
 
Increase mechanical advantage in simple machine Machines Uganda
 
Animal and plant groups Physics USA
 
We have a universal soul Religion USA
 
Correction on Rosa Parks History USA
 

Next 15 letters

 





Recommending mesothelioma resource

Health

January 16, 2017

Question

Good afternoon

My name is Virgil Anderson, and I’m a cancer patient at NCI. I saw some information on your site about mesothelioma and asbestos, and I was hoping you had room for mesothelioma.net. The medical professionals behind mesothelioma.net got me into NCI, and have been responsible for my continued battle against mesothelioma. They sponsor The American Cancer Society, ALA, Make a Wish Foundation, MD Anderson and many, many more.

Please, if there’s anything you can do to help, let me know.

I appreciate your time in advance, and hope you’re off to a good start in 2017.

God bless,

Virgil - USA (27809)

Answer

Thanks for the information. I checked an saw that I already have a link to mesothelioma.net. However, I moved it to a more prominent position.

Best wishes for a full recovery from your cancer.

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Weight of two containers of water

Physics

January 16, 2017

Question

Two containers one of them has water and small piece of wood and another one has only water which one is heavier ?

Misho - Egypt (27810)

Answer

If both containers have the same amount of water in them, then the one with the wood in it would be heavier by the weight of the wood.

However, if the containers were full to the top and the piece of wood was added to one of them, some water would overflow from the container. The weight of the overflow water would be the weight of the water displaced, such that both containers would then weigh the same.

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Calculating speed of light for spectral line

Physics

January 15, 2017

Question

Hi,
Hope you can help us. We are trying to calculate the velocity of a wavelength using a line profile.
We don't know what we are doing :-(
We know the rest wavelength 36.4680 nm, the line centre is 36.462 nm and c.
The anwser we are getting is 299785064.75!!!
Can the velocity of the wavelength be near the speed of light?
What is the correct formula?

Thank you on behalf of the LYIT astronomy society.

Seamus - Ireland (27806)

Answer

You need to be exact in your terminology. The "velocity of a wavelength" is incorrect. You should be looking at the velocity of light for a given wavelength.
In space, the light travels at the same speed for all wavelengths. When the radiation is passing through a material, the speed varies according to the wavelength or frequency.

If the source of the light is moving, the speed of light remains constant, but the wavelength can shift according to the direction and velocity of the source.

The profile of a spectral line is affected by the various velocities of the particles emitting that specific wavelength. The Doppler Effect causes the slight shifts in wavelength from the ideal situation.

I hope that helps.

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Replacement lids for Mastercraft waterless cooker

Health

January 14, 2017

Question

Do you have a source for replacement lids for Mastercraft waterless cookers? They have the steam release valves on them. These were purchased in the 80's. Any help you can offer would be appreciated.

Thanks!

Teresa - USA (27804)

Answer

Mastercraft cookware has been out of business for some time now. There are various used sets available online, but I doubt you could find replacement lids. Sorry.

Best wishes in finding a solution or source.

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Gas pressure on .5 square inch area

Physics

January 13, 2017

Question

what will the gas pressure on .5 square inch area if the pressure is 10 psi in a container of gas.

asif - Pakistan (27801)

Answer

"psi" stands for "pound per square inch". If the area is 0.5 square inch, the pressure would be 5 pounds.

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More electrons than protons

Physics

January 12, 2017

Question

what is the overall charge of an object that has 18 more electrons than protons?

jeffrey - Phillippines (27799)

Answer

Negative ions may have a few more electrons than protons. It would be very unusual to have 18 more electrons than protons. However, since electrons have a -1 charge, the overall charge of the object would be negative 18 or -18.

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Silk and static electricity

Static Electricity

January 12, 2017

Question

How does silk affect static electricity? If it doesn't, why not?

Connie - USA (27800)

Answer

Silk tends to give up electrons or gain positive charges. That means it would be attracted to materials that attract negative charges. See the list on Materials that Cause Static Electricity.

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Paperback spine labeling

Fiction

January 11, 2017

Question

I am trying to find out what is the correct "spine labeling" for a paperback book? Sould it just be "Fic, Mar" or should it be "Fic, PB, Mar"?

Linda - USA (27796)

Answer

If you are publishing a fiction paperback book, you should include the title, author, and publisher on the spine. See Book Cover Elements.

I assume "Fic" means fiction and "PB" means paperback, but I don't think you necessarily need that on the spine. Look at various paperbacks in the bookstore to get an idea of what is needed.

Best wishes for success in your writing.

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Convert mega Hz to peta Hz

Waves

January 8, 2017

Question

How to convert from mega Hertz to peta Hertz and vice visa

Susan - Nigeria (27792)

Answer

Mega stands for million or 10^6. Peta stands for 10^15.

To convert from mega Hz to peta Hz, You divide by 10^9. To go the other direction, you multiply by 10^9.

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Suggested resource

Finances

January 6, 2017

Question

Good morning Ron,

With a growing interest among college students to educate themselves about their unique financial situation, I thought the School for Champions might benefit from the information in our newly published 'Survival Guide to Personal Finance for College Students' — https://www.annuity.org/financial-literacy/students/. This piece - written by our Financial Literacy team at Annuity.org, provides tips for students on how to manage their finances before, during and after college. It explores questions such as “When Should I Fill Out My FAFSA?”, “How Do Student Loans Work?” and “Should I Consider Early Investing Options?”

We thought by reaching out to y'all, we could further the education about this important issue and hopefully help students feel financially secure as they enjoy the college experience. I hope you consider sharing this important resource for students with questions about their personal finances on your School of Champions' 'Personal Finance Resources' page.

Meghan - USA (27791)

Answer

Thanks for the suggested resource. I added it to our Personal Finance Resources page.

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Efficiency of a screw jack

Machines

January 5, 2017

Question

A screw jack is being used to support the axle of a tractor,the load on it being 2.4 KN.The screw jack has an effort of effective radius 200 mm and a single-start square thread,having a load of 5 mm.Determine the efficiency of the jack if an effort of 60 N is required to raise the tractor axle.

DAASI - Ghana (27787)

Answer

Efficiency is the output work divided by the input work. Work is defined as the force times the distance moved.

The input force is 60 N and the output force is 2.4 KN. According to your configuration, you need to determine how far the input and output forces move to determine the work ratio.

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Increase mechanical advantage in simple machine

Machines

January 4, 2017

Question

How can mechanical advantage of simple machines be increased

mercy sharleen - Uganda (27782)

Answer

It depends on the type of simple machine. In a lever, you can change the distance from the fulcrum to change the mechanical advantage. See Mechanical Advantage Relationships

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Animal and plant groups

Physics

January 4, 2017

Question

1. 10 animal groups
2. 10 plant groups

Jesus Ramon Neopolo - USA (27783)

Answer

See Animal Groups and Plant Groups for information.

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We have a universal soul

Religion

January 3, 2017

Question

My belief on "Do humans have a soul" is that all humans are born into one shared soul or spirit, and our behavior may be from our genetics and learned behavior combined. You can also teach yourself new behavior with concentration of your brain when and if our brain is mature enough.

Amorita - USA (27781)

Answer

There are a number of religions that believe there is a universal soul that everyone is part of. In such a case, that spirit or soul is having many human experiences.

Yes, behavior comes from genetics and learning. That could explain bad behavior independent of the soul.

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Correction on Rosa Parks

History

January 2, 2017

Question

Rosa Parks did not sit in the white section. Whenever there were not any seats left in the white section, African Americans had to give up the seats in their section of the bus. She refused to move from the seat assigned to African Americans...not the seat assigned to white people. Please check and correct this. Thank you.

Tabitha - USA (27778)

Answer

Thanks for setting the record straight. I corrected the material at Start the Fire Facts - 1956 - Alabama.

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