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Each day readers send in questions and feedback concerning the various lessons in the School for Champions website. A total of 15727 letters have been answered. They are listed according to date.

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



List of next 15 letters

Title

Subject

Section

Country

Wants an overview of health for essay Grades Nigeria
 
List of top investing books Finances USA
 
References on electrostatic painting Physics Static Electricity Egypt
 
New Triboelectric idea Physics Static Electricity USA
 
What do the signs mean Physics Gravitation Australia
 
Difference in echo times Physics Sound Tanzania
 
Electricity for water heater Physics Electricity USA
 
Suggested experiment Experiments Static Electricity USA
 
Questions on electromagetism Physics Magnetism India
 
Noise comes on every day Physics Sound UK
 
Suggested resource Entrepreneurship USA
 
How do electromagnets work in railway signals? Physics Magnetism India
 
I don't understand Astronomy at all Astronomy Canada
 
Is zero a variable? Algebra India
 
Unmarked saucepan needs fixing Health USA
 

Next 15 letters

 




First 15 letters


Wants an overview of health for essay

Grades

February 22, 2017

Question

Write on the overview of health

Dorathy - Nigeria (27901)

Answer

See What is Physical Health? to get some ideas for your essay.

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List of top investing books

Finances

February 21, 2017

Question

Hi Ron,

I was looking for some information on investing this morning when I came across your excellent Finances resource page.

I actually just published something you might enjoy. To keep it short, I combined the reading lists of 24 top investors/institutions to make a list of the most recommended investing books of all time.

It might make a good fit for your page. Either way, keep up the awesome work!

Cheers,

RJ - USA (27896)

Answer

Thanks for the resource. I added a link to Personal Finances Resources.

Best wishes for success in your work.

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References on electrostatic painting

Physics

February 20, 2017

Question

Greetings
I am Working on A project On High Voltage Engineering and i need any Reference talking about Electrostatic Painting
Best Regards

Mahmoud - Egypt (27892)

Answer

Some websites explaining the basics of electrostatic painting are:

Electrostatic coating

Electrostatic Spray Painting Basics Explained

How Does Electrostatic Spraying Work?

I hope that helps. Best wishes for success in your project.

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New Triboelectric idea

Physics

February 20, 2017

Question

Good Day to you sir,I have taken an interest on your webpage because I also work on Triboelectric generation techniques of my own that are considered totally outside of the box thinking. If you would be interested, I would very much like a moment of your time. THANK YOU

Benjamin - USA (27893)

Answer

It is good that you are coming up with some new applications.

I'm not sure if I could help you, but I'd be glad to take a look at your idea.

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What do the signs mean

Physics

February 19, 2017

Question

Hey I'm Aric and I'm trying to work out the gravitational attraction between the Sun and the Earth for homework
I just wanna know what the times, divide, plus and minus mean
Like as in;
* = Times?
/ = Divide/Fraction
- = Minus
and so on
Thanks

Aric - Australia (27888)

Answer

The equation F = GMm/R^2 means G times M times m divided by R squared or R times R.

To answer your question:
a*b means a times b or multiply a times b
a/b is a divided by b
a - b is a minus b or subtract b from a

The big thing is to find the mass of the Sun and of the Earth, as well as the distance between them.

I hope that helps. Best wishes in getting the problem solved.

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Difference in echo times

Physics

February 19, 2017

Question

a helcopter is hovering at an altitude of 200 m above the surface of a lake. a speaker on the helcopter is sending out soundwaves,which are reflected from both the surface of the water and the bottom of the lake. if the difference in arrive times of the two echoes is measured tobe 0.24s, what is the depth of the lake?
(the atmopheric temperature is 20centgreds)

Toroma - Tanzania (27890)

Answer

Most of the sound would be reflected at the surface of the water. Only a very small amount of the sound would go into the water. Also much of the sound would be reflected at the surface when trying to go back into air. In other words, the amount of sound reflected off the bottom of the lake probably could not even be detected.

The speed of sound in air is 343 m/s. So, it would take 200/343 = 0.58 seconds for the sound to go from the water to the helicopter.

The speed of sound in water is 1484 m/s. The sound would have to go to the bottom of the lake and then back up, and then it would take 0.58 s to reach the helicopter. For the difference to be 0.24 s, the depth would be 1/2 of 1484 * 0.24 = 178.08 m.

I hope that helps.

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Electricity for water heater

Physics

February 19, 2017

Question

I just found that I have current in the system from the hot wire of the water heater to ground . On one 110 with it removed from the breaker I get a reading of 1.7 volts to ground. The other reads .8 volts to ground. We went to checking because the power bill has been high and though that the water heater might have gone back. This is a older home and has had several changes over years. What would be the best way to find out what is going on.

Thanks for you help

Ben - USA (27891)

Answer

Often older homes have their electrical wiring installed or fixed incorrectly. I'm not sure how you could get readings of only 1.7 volts unless you have your voltmeter set wrong or the voltages are not for heating the water.

Although you probably hate to spend the money, it is best to get an electrician take a look at things. There may be some other reasons your power bill has been high, especially if the increase is recent.

Best wishes on solving your problem.

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Suggested experiment

Experiments

February 18, 2017

Question

In answer to the Cambodia teacher. I taught math/science camp. Retired math teacher. Shred tissue paper up into tiny pieces, use a plastic notebook binder sheet to pick up shreds with static electricity, kids k-12 love the experiment, plus it's cheap. MK BS M Ed. I even had Pre-K students try it.

Martha - USA (27887)

Answer

Thanks for the suggestion. I'll pass it on.

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Questions on electromagetism

Physics

February 17, 2017

Question

DC Electromagnet.
1. Ratio of Core area & Poles face area.
2. What is ATTRACTION POWER?
3. If three sides of magnet is covered with non magnetic material will there be more force on pole faces.
4. Construction & operation details of
ELECTRO-PERMENANT MAGNETS

tks. rgds, Vish

Viswanatan - India (27886)

Answer

See our lessons on Electromagnetism. They should help answer some of your questions.

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Noise comes on every day

Physics

February 16, 2017

Question

Dear Sir, please can you help me with this.
I have a building site across the road from my house.
I arrived home one day to a sound which was like my washing machine emptying out.
Since then the sound has changed. The Council monitored low voltage sound waves in the house and a sound consultant monitored 40 to 60 hertz.

Could it be that instead of hearing something emptying I actually heard something being connected to my pipes.

The sound now changes at the same time every day and I get brief interference on my TV at this time.

My main problem is that it gives me headaches and hurts my ears.

Could this be from a drainage/sump pump? Please can you give me some advice. Thank you.

Ann - UK (27884)

Answer

I am sure such a noise would be annoying to you. If they are building something across the street from your house, it could be that they are turning on some equipment at the same time each day. They fact that your TV has brief interference points to some electrical switching on or off.

It would be worthwhile to go to the building site and ask if they turn on some equipment at that certain time. This could give you a clue as to the cause of the noise.

It is possible that they have something connected to water or sewage pipes that reach your house. It could be some vibration from equipment pressing against the pipes or even pumping or draining from the pipes.

You might have to ask a few people there, and hopefully someone will give you a clue as the the cause of the noise.

I hope that helps in solving your problem. Best wishes for getting rid of that noise.

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Suggested resource

Entrepreneurship

February 15, 2017

Question

Hi Ron,

I just found your website! In particular, I enjoyed browsing through your Entrepreneurship resources.

It's great that there is also some information about starting an online store. Do you think it would be helpful to also include other ecommerce providers than just Shopify? We have a ranking table of various providers on our site. If you believe that this could be useful to your readers feel free to add it to the list.

Best of luck with your project!

Kind regards,

Robert - USA (27881)

Answer

Thanks for the suggested resource. I added it to Entrepreneurship Resources and ECommerce Resources.

Best wishes for success in your endeavors.

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How do electromagnets work in railway signals?

Physics

February 14, 2017

Question

How electromagnet works in railway signals?

Harsh - India (27879)

Answer

Railway signals can be flashing lights or a moving barrier.

An electromagnet could be used as a solenoid to turn on or turn off the railway signals.

The barrier is usually moved by an electric motor.

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I don't understand Astronomy at all

Astronomy

February 14, 2017

Question

I don't understand Astronomy at all. I don't enjoy studying about a whole new world that I've never visited. Is their an easy way to understand Triangulation, Radio telescopes?

Jawerriya - Canada (27880)

Answer

It can be interesting to look into the night sky and see all the numerous stars in the sky, as well as their movement throughout the year. Some people like to learn the constellations and arrangement of the stars.

However, Astronomy can delve deeper to find out what the planets and stars are made of. It is a scientific study that some people are interested in and others are not.

Triangulation is a method to determine distance using trigonometry. In Astronomy, it is useful to approximate distance of far-off objects.

A radio telescope uses radio waves instead of light ways to detect distant objects in space. In some situations, it works better than visible light.

Although teachers can often learning many facts without making the subject interesting, it is good to find things about the subject you like.

Best wishes for success in your studies.

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Is zero a variable?

Algebra

February 13, 2017

Question

0 is variable or constant

Chandra - India (27877)

Answer

Since zero (0) does not change, it is a constant and part of the number system.

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Unmarked saucepan needs fixing

Health

February 10, 2017

Question

I have a double boiler saucepan 2-3 qt with no brand mark. It's heavy and appears to be waterless. There is a circle on inside bottom of pan. The lid is Saladmaster and fits well. Did Saladmaster make a pan not branded??
Also missing handles on both pieces and the rectangular metal stub that handle fits onto is 1/2" x 3/4". The handle from the marked Saladmaster pan that came with this unmarked one fits on either pan. Need to know a possible brand so I can order handles to replace them.

Diane - USA (27873)

Answer

It is unlikely that Saladmaster would not have a brand mark on their cookware.

You can try to order parts from Saladmaster Parts. Personally, I would check into getting a new saucepan instead of trying to fix the old one.

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