Each day readers send in questions and feedback concerning the various lessons in the School for Champions website. A total of 15731 letters have been answered. They are listed according to date.
You can read them to further your understanding of the subjects.
|Update Guyana voltage||Physics||Electricity||Suriname|
|Trying to understand "Interstellar" movie||Magnetism||USA|
|Why are letters used in equations?||Algebra||Nigeria|
|Why were Clinton years not good for honesty?||Education||Congo|
|Materials for levers||Machines||India|
|Real clean web site||Thanks||USA|
|Equation different in textbook||Physics||Waves||India|
|Thank you for this website||Thanks||Physics||Germany|
|Formula without constant and variable||Algebra||UAE|
|When should I write my biography?||Biographies||Congo|
|Registering for online speaking training||Speaking||Nigeria|
|Dog bitten by Pit Bulls||Animal Health||USA|
|Using static electricity to charge phone||Physics||Static Electricity||Egypt|
Update Guyana voltage
March 24, 2017
Re: World list of AC household voltages has an error:
Guyana 60Hz = correct but 240V? No Way.!
Some 110 or 120V . Check it out!
Happy to see a comprehensive AC voltages listing.
Jozef - Suriname (27956)
Thanks for the input. The standard AC voltage in Guyana is 220 or 240V. However, there are many areas in the country that use 110VAC.
I updated the list to reflect state both voltages.
Trying to understand "Interstellar" movie
March 23, 2017
Hi I have a few questions I'm hoping you might be able to help me with the first - then the others if you are familiar with Interstellar, the movie, and might know how gravity and magnetic fields are seemingly used interchangeably in some instances in this flick.
First, I was hoping to understand this on a smaller level, more exactly, I was trying to figure out how electrons may or may or may not be involved.
Second, in the movie Interstellar, towards the beginning of the movie Matthew Mcconaughey drops a coin and it seems to be attracted to a magnetic field but he tells his daughter in the film that it is gravity that they are witnessing. How can that be?
Also, if you happen to know the above, maybe you could explain why he said the tractors all stated hoing haywire and he had to reset all their compasses and gps. I've seen the full film and the reason eludes me as I'm not familiar enough with magnetic fields that must be at work in the sci-fi film.
Thanks so much!!
Lauren, science lover and science mind wannabe.
Lauren - USA (27954)
Magnetic fields can be use to simulate gravity for iron objects. If a person had shoes with magnets on the soles, there would be an attraction to a iron or steel floor. However, for most objects, the fields are completely different.
Take a look at our lesson Artificial Gravity in Spacecraft to get an idea of how things could work.
I hope that helps to get some understanding. Of course, the stuff about "worm holes" and in the movies are science fiction.
March 22, 2017
My name is Jeron McFarland and I work in the outreach department at Mesothelioma Guide, an advocacy organization dedicated to helping patients diagnosed with asbestos illnesses. In addition, the resources and support you provide are commendable and something I personally admire. I can’t thank you enough for everything you’ve done assisting and guiding individuals throughout our communities.
Because Mesothelioma is a rare cancer and very few treat it, we specialize in connecting patients with doctors and treatment options that are best suited for them. Our services and resources are 100% free to patients and family members.
Unfortunately, that means we don’t have the necessary funding to advertise our services. Therefore, I'm reaching out to webmasters that have visitors who may have been exposed to asbestos or may be suffering from an asbestos-related illness.
I noticed you already have a mesothelioma resource in your links sections however, our resource separates itself from the rest for the simple fact that we have a Veteran and nurse, in-house, ready to answer questions from anyone all over the world. Would you be willing to add our resource to help us spread awareness? A little help can go a long way.
Jeron - USA (27944)
Thanks for the suggested resource. I added it to our Health Resources page. Best wishes for success in your work.
March 20, 2017
First off, I hope your week is off to a great start! I'm reaching out to you today as someone responsible for disseminating health and specifically sleep-related resources. As you may or may not be aware, sleep disorders affect over 73 million people in the United States alone and my team at Tuck sleep aims to help reduce that number would love your help!
We created pieces to help everyone from newborns to teenagers to college students to our aging population understand sleep disorders, sleep hygiene and an gain an increased understanding of the often confusing science behind sleep.
We're trying to raise sleep awareness worldwide and would your help in this effort. We’ve been lucky enough to be featured on NPR and TedEd, as well as referenced by organizations like the ADAA and the American Sleep Apnea Association to name a few and were wondering if you might be interested in utilizing our information as well. Would you consider sharing this information by adding a link or our resources here alongside the other great organizations you’ve featured or wherever you see fit?
Kayla - USA (27949)
Thanks for the resources. I added them to Health Resources and Aging Resources.
Why are letters used in equations?
March 11, 2017
why did they choose to use letter of alphabets or other symbols as a subject of the formular when numbers can still serve and is even easier to be used in rounding up calculation?
Chidi - Nigeria (27935)
Numbers are used in specific cases. The letters of the alphabet are considered variables, such that the equation or formula can be used with any numbers.
See Variables and Constants in Algebra for an explanation.
Why were Clinton years not good for honesty?
March 9, 2017
Why does William Bennett say that the Clinton years were not good years for impressing the virtue of honesty on our kids ?
Lucy - Congo (27934)
Although former President Clinton showed dishonesty during the Clinton-Lewinsky affair, I don't think that Mr. Clinton or people in his administration were basically dishonest.
Mr. Bennett's view of the Clinton years is somewhat biased by his political views, since he is a Conservative Republican and Clinton is a Democrat.
I hope that helps in your understanding. Best wishes for success in your studies.
Materials for levers
March 8, 2017
With what material mechanical lvers are made up of?
And what are the operation of mechanical levers?
Thank you :)
Chinmoy - India (27933)
A lever can be made of any material that is solid and strong enough to withstand a force. This includes some board used to lift an object on a pair of pliers. Look at the examples on the lever pages.
Real clean web site
March 4, 2017
Real clean web site, appreciate it for this post.
TS - USA (27926)
Thanks for your comments. I'm glad the website met your approval.
Equation different in textbook
March 2, 2017
In textbook eq. is given in terms of v, but in your lesson its given in terms of lambda.
Rajendra prasad - India (27919)
The velocity of a waveform--especially for light or sound--is often designated as "c" instead of "v". Lambda represents the wavelength.
You can also rearrange the equation to be wavelength = velocity/frequency.
Also see Doppler Effect Equations for Sound.
Thank you for this website
March 1, 2017
Hi, I only want to say thank you for this website and for keeping it up. It is nice to read some physics that is in the way your website describes the subject.
Shanon - Germany (27916)
I'm glad the material has been useful to you. Best wishes for success in your learning about Physics, as well as other topics.
Formula without constant and variable
March 1, 2017
Using formula without constant and Variable is right or wrong.(4-9/2)square 2 please clear it.thanks
Jamil - UAE (27918)
Just having numbers in the expression is simply an arithmetic exercise. What you have written is (4 - 9/2)^2, which would be (-1/2)^2 = 1/4.
When should I write my biography?
February 27, 2017
Good Day! My name is Gabriel, I am 24 years old and I want to know at what age am I supposed to write my biography?
Gabriel Clef - Congo (27910)
A biography is usually about some other person. An autobiography is what you write about yourself.
Some people keep a journal to write down interesting events in their lives. You can start writing about yourself and activities at any age.
When seeking a job, they often want to know what you have achieved related to the type of work. It is often good to have that written down beforehand.
Registering for online speaking training
February 25, 2017
Greetings! Please how can I register for this free online public speech traning?
Sylvanus - Nigeria (27907)
You do not have to register to use our Public Speaking lessons.
Although you can read about giving a speech, the best way to perfect your skills is by actually practicing speaking in front of a group. A good place to do that is through the Toastmasters Club. See Lighthouse Toastmasters in Lagos, Nigeria for information, as well as the location of other clubs in your area.
I highly recommend Toastmasters as a way to gain speaking skills and to get over any fears you have.
Best wishes on becoming a top-notch speaker.
Dog bitten by Pit Bulls
February 25, 2017
My Pitt got attacked by two other pit bulls. We were sitting down on steps. He has puncture wounds on his chest throat behind his right ear and one on the top of his head and some scratch marks around his mouth. He is laying still and sleeping a lot and would not eat which is one of his favorite things. My question is should he be seen by a vet?
Sue - USA (27908)
You definitely should bring your dog to see a vet as soon as possible. You need to make sure the wounds are not serious and to protect against infection from the bites.
I hope your dog is OK. Best wishes for his complete recovery.
Using static electricity to charge phone
February 24, 2017
if i somehow generated this static electricity, how would i use it for turning on something ?
and how much electricity needed to make a phone charger work for example ?
nada - Egypt (27904)
Static electricity is static and does not move like DC or AC electricity.
Most phone chargers use alternating current (AC) electricity to charge the batteries. However, there are some new chargers that use the wireless electricity signals to charge the batteries.
Static electricity can be used to generate sparks. That might be able to turn something on. But also, the sparks can cause damage to electrical devices.
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