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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 15862 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

Find total beat frequency Physics Sound India
 
Raise number to the zero power Algebra Canada
 
What plants do kawakawa compete with? Competition New Zealand
 
Are centrifugal force and inertial force the same? Physics Force India
 
Moving fast on a muddy road Physics Friction India
 
Period when mass of string is not neglected Physics Motion India
 
Problem with spinning spaceship Physics Gravity USA
 
Changing parameters in Cavendish experiment Physics Gravitation Egypt
 
Why isn't the solar system a giant atom? Physics Matter USA
 
How physical conditions affect density Physics Matter USA
 
Warm bath after overeating Health USA
 
Voltage, current, and resistance Physics Electricity USA
 
How are water molecules able to escape gravity? Physics Matter USA
 
find the slope of the pendulum graph Physics Motion Ghana
 
Center of gravity when standing on a ball Physics Gravity UK
 

Next 15 letters

 




First 15 letters


Find total beat frequency

Physics

October 16, 2017

Question

PLEASE SOLVE THIS QUESTION!

Three tuning forks of frequencies 200,203,207 Hz are sounded together. Find the beat frequency.

ONKAR - India (28288)

Answer

The beat frequency is the difference of two frequencies. See Beat Frequencies in Sound. For example, the beat frequency between 200 and 203 would be 3 Hz. Thus, you could have 3 different, overlapping beat frequencies.

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Raise number to the zero power

Algebra

October 16, 2017

Question

(3x^-3)^0

Does the exponent -3 x 0 = 0?

Jonathan - Canada (28290)

Answer

Any number raised to the zero power equals 1. For example x^0 = 1.

Thus (3x^-3)^0 = 1

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What plants do kawakawa compete with?

Competition

October 16, 2017

Question

What plants do kawakawa compete with for light, space and water please

Teia - New Zealand (28291)

Answer

Much of the competition with other plants has to do with where the kawakawa is located. It is difficult to tell in its natural habitat.

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Are centrifugal force and inertial force the same?

Physics

October 15, 2017

Question

I don't get the concept clearly. Is centrifugal force and inertial force are same?

krishna - India (28287)

Answer

An inertial force is a force that resists a change in velocity of an object. That means, it also resists a change in direction.

Since a centrifugal force is caused by a change in directions, it is an inertial force. However, accelerating an object results in an inertial force that is not a centrifugal force.

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Moving fast on a muddy road

Physics

October 12, 2017

Question

does it possible when a vehicle moves so fast in a muddy road ? does the tyre slips due to friction?

savana - India (28284)

Answer

If you accelerate the car on a muddy road, it is possible that the wheels will just start to spin. That is why the tyres need to have traction to go in muddy conditions. See Traction Friction of Tires for more information.

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Period when mass of string is not neglected

Physics

October 11, 2017

Question

plz tell us the formula for calculating time period of pendulum when the string mass is not neglected and the mass of the bob is less the string mass?

Akash - India (28278)

Answer

It is a complex calculation.

T = 2pi*SQRT(I/mgR), where T is the period, I is the moment of inertia, m is the mass of the object, and R is the center of mass between the pivot point and the bob.

Also, I = mL^2/3, where L is the length.

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Problem with spinning spaceship

Physics

October 11, 2017

Question

I can see a big problem where a spaceship has a spinning part as spaceship tries to make a turn. The spinning part want to go straight unfortunately the spaceship part wants to turn. It may be too much for the air seals.

a p - USA (28280)

Answer

If a spaceship was a rotating wheel or had part of it rotating, and it made a turn to change directions, it would affect the artificial gravity inside the wheel. It could be possible for one side to increase the artificial gravity, while another part lose the gravity, such that people on that dies would start floating.

The best thing for a rotating spaceship would be to stay in a straight line or be in orbit around the Earth.

Air seals would not be a factor.

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Changing parameters in Cavendish experiment

Physics

October 11, 2017

Question

If we change
1 - Diameters of the balls
2 - masses of the balls
3 - metals of the balls
4- L torsion bar length
if you change the previous parameters will G still constant factor???!!!
I wish your answer and Thank you very much.

Anwer - Egypt (28281)

Answer

You can change the parameters and perform the Cavendish Experiment to get the value of the gravitation constant G. However, the values need to be optimized to get the most accurate result. For example, if the masses of the balls were decreased, the resulting value for G would not be as accurate and there might be some errors in the measurement.

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Why isn't the solar system a giant atom?

Physics

October 5, 2017

Question

I had a question about the article you wrote regarding Bohr's Model of an atom. Why do you disagree with the fact that our solar system can't be just one "giant" atom. I was hoping to get in touch with you to discuss this?

Tristan - USA (28273)

Answer

Although our solar system looks like it could be a giant atom, there are a number of problems in the analogy. One it that electrons in an atom have an electrical charge, while there is nothing similar in the solar system. Also, the nucleus of an atom is made up of protons and neutrons, while the Sun is a mass of hot gases.

On the quantum scale, atomic particles are not tiny spheres but are wave packets.

Still, the similarity between the solar systems and atoms is intriguing.

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How physical conditions affect density

Physics

September 30, 2017

Question

Describe how physical conditions affect density

kiprotich - USA (28267)

Answer

Density is mass divided by volume. Compressing an object decreases its volume and thus increases its density.

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Warm bath after overeating

Health

September 30, 2017

Question

Does taking a nice warm bath help stomach aches after overeating?

Eli - USA (28268)

Answer

Although a warm batch can relax you, I don't think it does much to relieve stomach aches after overeating.

You should try not to eat too much. A stomach ache should be a warning to you.

Digestive aids can help relieve the stomach discomfort. But they should not be taken all the time.

Best wishes for good stomach health.

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Voltage, current, and resistance

Physics

September 27, 2017

Question

1. in a dc circuit is the ratio of voltage to current equal to the resistance?

ijagbemi - USA (28262)

Answer

According to Ohm's Law for Simple Electrical Circuits, V = IR or V/I = R, where V is the voltage, I is the current, and R is the resistance.

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How are water molecules able to escape gravity?

Physics

September 22, 2017

Question

How are water molecules able to escape gravity? In other words, gravity withholds H2O from leaving the surface of the earth, but that same body of water evaporates and those molecules are unaffected by gravity.

Travis - USA (28256)

Answer

With water, the velocity of the molecules is not great enough to overcome their molecular attraction, and thus the material is a liquid that is kept toward the surface of the Earth. However, when H20 becomes a gas, the velocities of the molecules is much greater, such that they move about freely.

Most of those molecules velocities that are low enough to be constrained to the Earth's atmosphere. But some of the molecules of the gas or steam become accelerated due to radiation from the Sn, such that they have enough kinetic energy or velocity to escape the Earth's gravity.

Fortunately, the loss of water vapor molecules into space it very small.

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find the slope of the pendulum graph

Physics

September 21, 2017

Question

Set up a pendulum of length: l=100.0, l=90, l=80, l=70 displace the bob vertical about its equilibrium determine the time, tandperiodic time, T for 20 oscillations and plot a graph with T2 as ordinate and L as abscissa determine the slope s of the graph.evaluate P=(4(22/7)(22/7))/s

Josiah - Ghana (28254)

Answer

You need to look at the equations in Equations for a Simple Pendulum and input your values to make a graph.

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Center of gravity when standing on a ball

Physics

September 20, 2017

Question

If we are standing upright on the ball of one foot where would our centre of gravity be on our foot?

Athos - UK (28251)

Answer

The centre of gravity would be somewhere in the centre of the person. However, there would be a ling going from the COG to the point where the foot meets the ball.

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