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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 16087 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

Sound of sea is louder at night Physics Pakistan
 
Affect of force Force India
 
Hope you get an "A" Grades USA
 
Doctors could identify typhoid fever Health USA
 
Charge a rod through electrostatic induction Static Electricity Nigeria
 
Role of moons in theory Physics Matter India
 
Using hard wired chandelier with 240 VAC Electricity USA
 
Comments on theory Matter India
 
Theory comments Matter India
 
Comparing the earth to an atom Thanks USA
 
Moving the magnetic field Physics Electricity USA
 
Where does Jesus stand in Unity? Religion USA
 
When rocket thrust is reduced Gravity USA
 
What is efficiency? Machines USA
 
Relationship between Brownian motion and Kinetic theory Physics Matter USA
 

Next 15 letters





Sound of sea is louder at night

Physics

October 8, 2019

Question

Why sound of sea is louder at night than day time???

Nahida - Pakistan (29214)

Answer

The loudness or amplitude of sound increases with a reduction in temperature. The air above the sea is cooler at night and thus seems louder.

See Sound Seems Amplified Over Water for an explanation.

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Affect of force

Force

October 5, 2019

Question

If we force the object it will change its shape,size or motion

Zuhair - India (29209)

Answer

If you apply a force on an object, you can accelerate the object. But it is also possible for the force to change the shape of an object, such as when you push on a soft object. A force applied in all direction on an object can compress it and change its size.

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Hope you get an "A"

Grades

October 4, 2019

Question

WOw, I hope this throws my teacher off. I'm using this as an essay subject.

Najai - USA (29208)

Answer

I hope you get an "A" in your essay.

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Doctors could identify typhoid fever

Health

October 3, 2019

Question

I've read that doctors could identify typhoid fever by a patient odor strongly resembling that of fresh-baked bread. Typhus victims, on the other hand, have breath with a "peculiar musty odor," according to an old encyclopedia I have.

Paula - USA (29206)

Answer

Thanks for the information. It is a shame that the old ways of diagnosis have gone by the wayside.

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Charge a rod through electrostatic induction

Static Electricity

September 14, 2019

Question

How would you charge a rod through electrostatic induction?

Ugochukwu - Nigeria (29177)

Answer

If you placed a nonconducting object such as a plastic rod or sphere that has charges on its surface near a metal or conducting object--such as a metal rod--your can induce electrical charges in the rod. Often this effect lasts for a short time, since the charges may be drained off.

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Role of moons in theory

Physics

September 9, 2019

Question

1 how would the moon plays role in the given theory?
2 what would change in the theory if e considered 9 planets?
Or change to 12 planets?>

majid - India (29165)

Answer

The Solar System model of an atom looks at electrons moving around the nucleus of the atom. However, in most solar systems, many planets also have one or more moons revolving around the planet. This presents a problem with this model, since electrons are primary particles that cannot be subdivided.

Also, according to Quantum Mechanics, the sub-atomic particles can be viewed as wave-forms.

Thus, this model is simply convenient way of looking at the Solar System.

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Using hard wired chandelier with 240 VAC

Electricity

August 21, 2019

Question

I have a ‘hard wired’ chandelier that says 120V 60Hz AC Only. Can this be used in Kenya where it is 240V 50Hz AC? Does it being hard wired makes a difference?

Sam - USA (29156)

Answer

You could use a AC power converter to reduce the voltage to the chandelier, but it probably be more work than it is worth it, especially since the converter would have to be between the source and the chandelier.

The difference in frequency would not be an issue, but 240 VAC input would cause problems.

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Comments on theory

Matter

August 19, 2019

Question

Actually you're theory is correct because all the things scientists found yet is just a theory.
All we have know till are based on hypothetical concepts. And it is true that human always contradict himself and creates a new theory.
Well if I say what if....
-Solar system = atom
-Electron orbits in elliptical orbit so as planets
-galaxy is just a big chain of atoms
-cosmic web are bonded big chain of atom
-and universe is just a molecule
What if things be like this.
So actually we can say that the deeper we look the bigger we see

Yug - India (29152)

Answer

Thanks for your comments and insight.

Best wishes in your studies.

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Theory comments

Matter

August 19, 2019

Question

This theory of a solar system to be an atom can be true. Because we know that whatever scientists found yet are just theories based on hypothetical concepts and experiment. And it's is a fact that we makes theories and contradict ourselves and then again creates a new theory.
But what if it is true, what if
*Solar system be an atom
*Planets be electons revolving elliptically around sun (nucleus)
*Also sun has quiet very much mass and also creates a big depression on space time facbric.
*And galaxy are bonded atoms
*Cosmic web are chain of bonds of different atoms
*And finally universe and a molecule.
This thing clear one fact that as we look deeper we see things gets bigger.
And also as time is relative....
And we know that because of Heisenberg uncertainty principle that electron have a very movement or velocity.....but if we compare it to solar system it is very slow....
It maybe the cause of relatively of time.
And there are many more theories that can be true for proving that an atom is just solar system....
So as we go beyond universe we finds that there is another universe cause our as being one of those parallel universe.....!!!!!
And actually there is no end of anything we seen yet....!!!!

Yug - India (29155)

Answer

The theory and concept has many implications, as you observed. It can be an interesting study.

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Comparing the earth to an atom

Thanks

August 16, 2019

Question

Just stumbled across this page tonight while googling "comparing the earth to an atom" ...etc. stuff that I've had on my mind for some time now (years!) And I just want to say, wow. I mean.. I'm just getting started, but, this is awesome.

Thank you for creating this website.

Desa - USA (29148)

Answer

Yes, it is quite an interesting analogy. I'm glad you enjoyed the material and found it useful.

Best wishes for success in your studies.

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Moving the magnetic field

Physics

August 16, 2019

Question

I'm a tutor. Discussing electricity with students. This came up. If you move the field around the coil, instead of the coil moving, would that generate a current? Thank you!

james - USA (29151)

Answer

The first illustration in Generating Electrical Current shows a wire moving through a magnetic field. You could easily move the magnets and keep the wire stationary for the same effect.

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Where does Jesus stand in Unity?

Religion

August 15, 2019

Question

I was born and raised as a Catholic but eventually became a non-denominational Christian. I believe in the bible and believe that Jesus is the Son of God. Where does Jesus stand in Unity?

peggy - USA (29147)

Answer

Unity Church followers believe that all humans are the children of God and share that divine potential. Thus, they believe in the divinity of Jesus, but only in the sense that Jesus is the great example of the Christ in physical form.

Thus, their view is not that Jesus came to save us from our sins but rather as an example of how to relate to God.

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When rocket thrust is reduced

Gravity

July 20, 2019

Question

Could you also please address what happens if at 20m/s, the rocket thrust is reduced and maintained to exactly balance gravity?

Obviously we ignore other gravities, air resistance, etc.

It is my opinion that when thrust = gravity, velocity remains constant and all thrust energy is converted to potential energy.

Mike - USA (29117)

Answer

Once the rocket thrust is reduced to simply balance the force of gravity, the rocket will continue at 20 m/s (assuming no air resistance).

Since the potential energy of the rocket with respect to gravity is simply PE = mgh, where "h" is the altitude, PE will increase PE will increase at a constant rate and the thrust energy is converted into that PE.

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What is efficiency?

Machines

July 12, 2019

Question

What is efficiency?

Aeesha - USA (29104)

Answer

The efficiency of a machine indicates how well its input energy is converted to useful output energy or work. In other words, efficiency is the output work divided by the input work.

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Relationship between Brownian motion and Kinetic theory

Physics

July 9, 2019

Question

What is the relationship between Brownian motion and the Kinetic Theory of Matter?

Your content is rich on the topic.

Emmanuel - USA (29098)

Answer

The Kinetic Theory of Matter states that matter is composed of a large number of small particles—individual atoms or molecules—that are in constant motion.

On the other hand, Brownian motion is the erratic random movement of microscopic particles in a fluid, as a result of continuous bombardment from molecules of the surrounding medium. Thus Brownian motion concerns the collisions of particles in motion due to the Kinetic Theory of Matter.

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