Feedback Blog

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.

List of next 15 letters

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

October 16, 2017

Question

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

ONKAR - India (28288)

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.

Raise number to the zero power

October 16, 2017

Question

(3x^-3)^0

Does the exponent -3 x 0 = 0?

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

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

What plants do kawakawa compete with?

October 16, 2017

Question

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

Teia - New Zealand (28291)

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.

Are centrifugal force and inertial force the same?

October 15, 2017

Question

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

krishna - India (28287)

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.

Moving fast on a muddy road

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)

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.

Period when mass of string is not neglected

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)

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.

Problem with spinning spaceship

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)

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.

Changing parameters in Cavendish experiment

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???!!!

Anwer - Egypt (28281)

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.

Why isn't the solar system a giant atom?

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)

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.

How physical conditions affect density

Physics

September 30, 2017

Question

Describe how physical conditions affect density

kiprotich - USA (28267)

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

Warm bath after overeating

Health

September 30, 2017

Question

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

Eli - USA (28268)

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.

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)

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.

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)

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.

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)

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

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)

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.

Misc

Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.

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