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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 16068 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

Applying a force Force Philippines
 
Confusion about inertia Force India
 
Separation from time interval Sound USA
 
Details on starting a business Entrepreneurship Nigeria
 
Designing back cover Publishing India
 
Contact surface in rollers Machines Pakistan
 
Suggested resource Career Germany
 
Loudness of sound under water Sound Papua New Guinea
 
Dropping a piano Gravity USA
 
Direction of motion Machines Tanzania
 
Suggested resource Aging USA
 
Son is struggling with numbers in school Grades South Africa
 
Thanks for the voltage info Thanks Australia
 
Computer Science vs Chemical Engineering Career Uganda
 
What are quarks? Physics Sudan
 

Next 15 letters

 





Applying a force

Force

June 12, 2019

Question

When you apply the force, does it means there's a motion all the time ? And explain.

Norjanah - Philippines (29065)

Answer

When you apply a force on an object, that force must overcome any friction that prevents the object from moving. Once the force is greater than the resistance from friction or other resistance, the object will move.

If there is no friction holding the object back, it will move freely and accelerate according to F = ma.

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Confusion about inertia

Force

June 3, 2019

Question

If a body of mass m is accelerated with acceleration 'a 'then force is na and inertia force also _ma ,so resultant force is zero then how body accelerated?

Abhishek - India (29060)

Answer

The concept can be confusing. The inertial force is simply what is felt and does not affect the resultant force.

I updated the Inertial Force page to help clarify the concept. I hope that helps.

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Separation from time interval

Sound

June 1, 2019

Question

Two men stand a distance apart besides a long metal fence on a still day. One man places his ear against the fence while the other gives the fence a sharp knock with a hammer. Two sounds separated by a time interval of 0.5s are heard by the first man. If the velocity of sound in air is 330m/s and in the metal 5280m/s, How far apart are the men?

Moses - USA (29057)

Answer

You have to use some Algebra to solve the problem.

Let d equal the separation. Also d = v*t. The time for the sound to travel in each medium is t1 = d/v1 and t2 = d/v2.

If the time interval is (t1 - t2) = 0.5 s, then 0.5 = (d/v1 - d/v2) = d*(1/v1 - 1/v2), and d = 0.5*v1*v2/(v2 - v1)

Substituting v1 = 330 m/s and v2 = 5280 m/s in the equation will result in the separation.

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Details on starting a business

Entrepreneurship

May 27, 2019

Question

I need full details on how to start my own business.

Abdulrasheed - Nigeria (29052)

Answer

First of all, you need to define what sort of business you want to start. Do you want to sell a product or a service?

It is always good to start small before seeking investors in your business. Also, it is good to get others interested in your ideas.

Go through the lessons in
https://www.school-for-champions.com/entrepreneurship.htm

and also check many of the resource websites at:

https://www.school-for-champions.com/entrepreneurship/resources.htm

Best wishes for success in starting and running your business.

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Designing back cover

Publishing

May 21, 2019

Question

Please suggest or design a book cover back cover or spine cover of a book based on the story:
A boy scores bad marks in class X and left his home.
After passing some years wandering here ad there he joins a assistant magician to a group.
He marries with the daughter of head magician
He wants His children should do further study and should not join as a magician.
The theme : Importance of Education

Dr Rajesh - India (29048)

Answer

First of all, you need a catchy title for your book that will get readers interested in it. Then on the back cover, under the title you need to have a few sentences that will summarize and create more interest. For example: "This book shows how a father wants to teach his children from the lessons learned from not having a good education."

You can then list highlight points from the book and perhaps comments from people who read your book.

Go to a bookstore or library and study the back covers of similar books.

Best wishes in writing, designing, and publishing your book.

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Contact surface in rollers

Machines

May 20, 2019

Question

As the friction does not depend upon the surface of contact then how rolling reduces the friction?

Abdur - Pakistan (29046)

Answer

If you consider sliding an object across the ground, you can see that using rollers or wheels results in much less friction.

The only friction in using rollers is due to a slight "stickiness" an the contact surface. But this is negligible.

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Suggested resource

Career

May 18, 2019

Question


Hey School for Champions Editors,
I was doing some research on interview tips and noticed that you have this killer resource page on your site: https://www.school-for-champions.com/career/resources.htm#.XOA9-MgzbIU . Awesome job!

Since you’re clearly an authority on the subject, I thought you’d be interested in checking out my article on "Best Interview Practices for Job Seekers". It’s super in-depth and I think it would make an awesome addition to your resource page (especially as your readers would love and benefit from it immensely).

Here’s the link if you’d like to check it out:
https://www.cleverism.com/best-interview-practices-job-seekers/

Cheers,
Martin
CEO Cleverism

Martin - Germany (29042)

Answer

Thanks for the suggested resource. I added a link at https://www.school-for-champions.com/career/resources.htm#Interview_skills

Best wishes for success in your work.

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Loudness of sound under water

Sound

May 14, 2019

Question

Is the loudness of sound greatest in water than it is in air

Willie - Papua New Guinea (29037)

Answer

The loudness or amplitude of a sound under water seems louder than in air. One reason is that in air, only your eardrum detects the sound. However, under water, your eardrum and your skull sense the sound. Also, sound travels faster under water.

You can test the loudness by comparing a sound from the clicking objects together above water and doing the same under water with your head also under water.

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Dropping a piano

Gravity

May 12, 2019

Question

Is there work done on a piano when you drop it from the fourth floor to the ground floor

eman - USA (29032)

Answer

Work is defined as the force required to overcome a resistance times the distance traveled.

Lifting a piano would require work to overcome the force of gravity or weight of the object. Work done by gravity in dropping a piano would be overcoming the slight air resistance.

Hopefully, no one is standing under the piano if dropped from the fourth floor.

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Direction of motion

Machines

May 9, 2019

Question

With reference to the explanation given on the second class lever, you said the movement of both load and effort are in the same direction. THIS IS NOT CORRECT. Take an example of a wheelbarrow which in the second class, in it the load (weight) is directed downward while an effort which is applied is directed (acting) upwards, therefore the movements of these forces (load and effort) are opposite.
Thanks,
I'll be glad to get your reaction.

Issa - Tanzania (29029)

Answer

Thank you for your observations. With a wheelbarrow, you pull upward on the handles to raise the load.

I updated the images on Three Lever Classes to clarify the directions on the motions for the various lever classes.

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Suggested resource

Aging

May 8, 2019

Question

Good Morning,

I hope your Wednesday is going well. My name is Garrett and I’m reaching out on behalf of Baylor University's Online Graduate Programs. I work with the university to distribute useful school-generated content to credible and relevant websites with similar content and audience interests.

Recently, I came across the "Healthy Aging Resources" page on the School for Champions website, located here:
https://www.school-for-champions.com/aging/resources.htm#.XMsVbGhKjIU

I was impressed by the gerontology resources you've assembled and was wondering if you'd be open to sharing an additional resource with your community? 

If so, I’d like to suggest "How Communities Can Prepare for the Growing Aging Population," published by The MPH online program from Baylor University's Robbins College of Health and Human Sciences. This resource discusses how to make communities more inclusive for the older adult population. It offers examples from ten age-friendly U.S. communities and further examines how changes in things like transportation, housing, and outdoor spaces can help people age actively. I believe this would be an excellent resource for your community as it is relevant to the gerontology resources provided on the page.

Below is the URL to the resource:
https://onlinegrad.baylor.edu/resources/communities-safe-aging-in-place/

Would you be open to sharing this resource with your community on the webpage?

Thank you for your consideration. Please feel free to contact me if you have any questions or need additional information. I look forward to hearing from you soon!

Best Regards,
Garrett Perry

Garrett - USA (29027)

Answer

Thanks for the suggested resource. I added a link at Healthy Aging Resources.

Best wishes for success in your work.

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Son is struggling with numbers in school

Grades

May 3, 2019

Question

my son is doing grade 2 he is eighty years old he is olways strugling to pass at school am worried about it he is not good in counting numbers

Phelelani - South Africa (29024)

Answer

It is good that you are helping and giving him encouragement.

You might let him try out Counting Games for Kids on your computer. The practice can be fun for him and get him more interested in the subject. There are other similar websites to help young students practice.

I hope this helps. Best wishes for your son's success in school.

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Thanks for the voltage info

Thanks

May 1, 2019

Question

Thanks for the voltage info. Very helpful

Frank - Australia (29022)

Answer

I'm glad the material was helpful to you. Best wishes for success in your endeavors.

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Computer Science vs Chemical Engineering

Career

April 30, 2019

Question

which of the two can i study to be employed easily: 1.bachelors in computer science. 2.bachelors in chemical engineering.

atuhaire - Uganda (29019)

Answer

There is a demand for college graduates in both areas of study. The most important thing to consider is which are are you most skilled and that you enjoy the type of work.

Note that Computer Science is often used along with Chemical Engineering, so studying both would be good.

It is good to check with companies in your area to see what they have to offer. In this way, you can tell the potential and wages for the type of job you select.

For example, check out:

Computer Programming jobs: http://fresherjobsuganda.com/2018/05/22/graduate-jobs-in-uganda-2018-computer-programmer/

and Chemical Engineering jobs: https://www.engineering.com/jobs/browse-by-country-category/Uganda/Chemical%20Engineering/

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

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What are quarks?

Physics

April 30, 2019

Question

Physics
What are the quarks ,and did it found before or after the (the Big Bang Theory).

Abdelgadir - Sudan (29021)

Answer

A quark is a fundamental or elementary particle of matter that is part of such particles as protons and Neutrons. See Fundamental Particles of Matter.

Quarks were discovered around 1968.

The Big Bang Theory was proposed around 1929, although there were other similar theories many years before that.

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