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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 16043 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

Relationship between math and science Physics Basics Zambia
 
Evaluation of curriculum Education Nigeria
 
Solve for R-values Physics Philippines
 
Is brick a better insulator than wood? Physics UK
 
Properties of good insulators Physics Thermal Energy USA
 
Doppler effect Physics Light India
 
Real world example Machines USA
 
Time to reach the ground Physics Gravity India
 
Rubber rollers Static Electricity Iran
 
Senior's Computer Basics Aging USA
 
Confusion on thermal energy Physics Thermal Energy USA
 
Static charges and slugs Physics Static Electricity UK
 
Electroscope Static Electricity USA
 
Thermo-Sentinel cookware handles Health USA
 
Suggested resource Web Design Norway
 

Next 15 letters

 





Relationship between math and science

Physics

February 13, 2019

Question

What is the relationship between maths and science with example?

lesa - Zambia (28942)

Answer

You can learn about the various sciences with no mathematics at all. However, if you want to measure effects and make predictions, you need to use mathematics to make the calculations.

For example, you know that a ball will fall to the ground due to the force of gravity. That is science and physics. But if you want to know how long it takes to hit the ground from a certain height, you need to use the formula and make the calculations with the math.

I hope that helps your understanding. Best wishes for success in your studies.

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Evaluation of curriculum

Education

February 12, 2019

Question

With an adequate example, examine the statement "evaluation curriculum is the last process."

Patrick - Nigeria (28939)

Answer

It is important for the teacher to evaluate whether the curriculum has been effective in educating the students according to the goals of the class.

If many students fail an exam, the teacher must determine whether the curriculum was too difficult for this level of students, whether the material was poorly taught, or whether the test was too difficult.

Even before this, getting feedback from students and from other teachers is important in determining how well the material is taught.

I hope that helps. Best wishes for success in teaching students.

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Solve for R-values

Physics

February 3, 2019

Question

How did you solve for the R values?

Eron - Philippines (28935)

Answer

An R-value is the capacity of an insulating material to resist heat flow. The higher the R-value, the greater the insulating power.

An article that explains how to calculate the R-value is: What Does R-Value Mean?

I hope that helps.

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Is brick a better insulator than wood?

Physics

February 1, 2019

Question

Is brick a better insulator then wood?

Tyler - UK (28932)

Answer

Since brick is very solid, it is not really a very good insulator. On the other hand, wood is a good insulator. For some information, see Brick Homes vs Wood Homes.

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Properties of good insulators

Physics

February 1, 2019

Question

what are some good properties of good insulators.

ruben - USA (28933)

Answer

Certainly, a good insulator should hinder outside heat transfer (hot or cold). But also, the insulator must not weigh too much or take up too much space.

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Doppler effect

Physics

January 31, 2019

Question

What will happen if object travels at half the speed of light. Is doppler effect applicable for electromagnetic waves?

Pankaj - India (28930)

Answer

An object must travel at about 90% the speed of light for any noticeable effect. See Speed of Light for information.

Also see Doppler Effect Equations for Light.

I hope that helps your understanding.

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Real world example

Machines

January 28, 2019

Question

on youtube there is a 94 year old man using a tool called OTLVISE and He moves 300 lbs up stairs by Himself with it... Using a real world example teaches better the use of a simple machine as it uses a lever, wheels and a clamp with offset ergonomic handles.

john - USA (28925)

Answer

That sounds like an interesting device. Apparently, it is also used to move pool tables.

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Time to reach the ground

Physics

January 27, 2019

Question

I have seen an equation to calculate time of an object to reach the ground as
t=?2h/g
Can you please help understand how this equation has come

Srinivasan - India (28924)

Answer

The time it takes a falling object to reach the ground is t = SQRT(2h/g) where h is the height or distance to the ground.

See Gravity Time Equations for Falling Objects for information.

I hope that helps.

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Rubber rollers

Static Electricity

January 26, 2019

Question

I want to catch best quality after printing with rotogravure machine and I search about charg rubber roller across working
But I don't know possible changing rubber roller with this generator for better absorb ink or no?
Please guide me
Thanks a lot.

Mohammad - Iran (28923)

Answer

I am sorry, but I don't have information on rubber rollers for rotogravure machine.

Best wishes on solving your problem.

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Senior's Computer Basics

Aging

January 21, 2019

Question

I wanted to write to you about your web page. I volunteer as a teacher for a computer class at my local senior center. Your page on Healthy Aging Resources has some great seniors pages that I plan on sharing with the group. Thanks a bunch!

My daughter, Jessie, also found a page on Seniors' Computer Basics. Can you include this in your list of resources? She's thinking about joining me as a volunteer, so I thought her sharing her suggestion online would give her an extra push. And help other seniors online. :-)

If you have any other resource suggestions, please let me know. Thanks again!

Best,

Alyssa - USA (28917)

Answer

Thanks for the suggested resource. I added it to the Healthy Aging Resources page under "Using the Computer."

Best wishes for your success in teaching and in having Jessie as a volunteer to help out.

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Confusion on thermal energy

Physics

January 15, 2019

Question

My question is the following:

It has to do with the idea of thermal energy being a sum of both the kinetic and potential energy of a material. Because I am teaching 8th grade Science at the time, I am trying to keep this as simple as possible. However, a student asked if two samples of air (one at approx. 0 Celsius, and the other at approx 27 Celsius) have different amounts of potential energy? After reading more about it, my thought would be no, they would have the same potential energy, just different amounts.

Rebecca - USA (28916)

Answer

The definitions of thermal kinetic energy and potential energy can be confusing. I updated the whole section to try to clarify issues and make it easier to understand.

What is called Internal Energy is the sum of the Thermal Kinetic Energy and Thermal Potential Energy.

See the updated versions of Thermal Energy is Kinetic Energy and Thermal Potential Energy.

The potential energy of two sample of air at different temperatures would be approximately the same. However, since the atoms or molecules travel faster at the higher temperature, the kinetic or thermal energy would be greater for the higher temperature.

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

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Static charges and slugs

Physics

January 14, 2019

Question

Hello. I want to find a combination of materials that will hold a static charge for as long as possible to repel slugs and snails from a planter.
I have bought a copper braid copper adhesive strip for the purpose, but I want to find out that if I was to line the inside circumference of the planter with 15mm copper pipe and induced a very low current,(not enough to kill them, but enough to see them off)how long would either the static charge last as environmental conditions would influence this as well as a battery charge. Any help would be appreciated, thanks

mark - UK (28913)

Answer

One of the methods to get rid of with static electricity is explained in: How do I Get Rid of Slugs and Snails in my Garden? listed under "Give them a shock".

The method states that since slugs leave a slime trail, by using copper tape the slugs will get small electric shocks from the static electricity caused by the copper-slime combination.

The electric charge would only hold while the slug is moving along the copper tape.

I hope that helps. Best wishes in getting rid of those pests.

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Electroscope

Static Electricity

January 10, 2019

Question

How can you tell that the electroscope is working

potatogurl - USA (28910)

Answer

The leaves on the electroscope should separate when a static electricity source is near. Using a plastic comb or rubbed balloon are often simple sources.

The leaves in the electroscope should be thin and lightweight.

However, if the electroscope leaves are too heavy, too stiff, or are made of a material that does not respond the static, they may not separate.
You can then experiment with different materials.

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

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Thermo-Sentinel cookware handles

Health

January 9, 2019

Question

Would you have any information on where I can purchase replacement handles for Thermo Sentinel stainless steel cookware bought in the 70’s
Thanks for your time.

Flo - USA (28909)

Answer

It looks like your cookware has lasted a long time. That is great,

I think Thermo-Sentinel was bought out by Vita Craft cookware. You can try their website at Vita Craft or call 1-800-359-3444.

Another possibility is to check your local hardware store or handyman for generic handles.

Best wishes for solving your problem.

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Suggested resource

Web Design

January 5, 2019

Question

Hi Ron,
I just happened to come across your list of Web design resources, and I wanted to suggest an addition.
I’ve written a detailed guide on how to create a website that might fit that list very well
You can see it here: https://thewebsiteroad.com/
What differentiates it from other guides is the in-depth explanation of each step, combined with the opportunity of the “normal” quick guide.
Let me know what you think
Cheers.

Knut - Norway (28905)

Answer

Thanks for the resource . I added a link to your site at Web Design Resources.

You've got a good looking website with helpful information. Best wishes for success in your work.

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