Each day readers send in questions and feedback concerning the various lessons in the School for Champions website. A total of 15599 letters have been answered.
|Explanation on this topic is misleading||Magnetism||Cyprus|
|Changing distance and mass of objects||Gravitation||USA|
|Charge created when rubbing materials together||Static Electricity||Pakistan|
|Are subatomic particles matter?||Matter||Canada|
|Dry ice and water||Matter||India|
|Needs handle for Dine Rite cookware||Health||USA|
|Restaurant market segment in Mumbai||Competition||India|
|Adding two fractions||Arithmetic||USA|
|Are electrons in orbit a theory?||Matter||USA|
|Dirty playing in high school football games||Competition||USA|
|Wants to avoid having sparks ignite gasoline||Static Electricity||USA|
|Could the Universe be inside a living being?||Matter||UK|
October 25, 2016
You have probably heard this from someone else, but don't you mean:
"Since the units of R are in meters"?
Since the units of G are in meters, you need to change the units of separation to meters.
R = 3.844*108 m
Michael - USA (27412)
Thanks for pointing out the confusion. I updated the sentence to read: "Since the units of G are in N-m^2/kg^2, you need to convert the units of R to meters."
I hope that clarified things.
Explanation on this topic is misleading
October 22, 2016
Your explanation on this topic is misleading. A magnet's poles were named after the directions in which they point. In other words they were named AFTER the locations, NOT, as you suggest, the other way around. If you start with the fact that the magnet's poles were named after the locations of Earth's poles, the no confusion would exist!
Adrian - Cyprus (27403)
The convention in early compasses was to call the end of the needle pointing to the Earth's North Magnetic Pole the "north pole" (or "north-seeking pole") and the other end the "south pole". Because opposite poles attract, this definition means that the Earth's North Magnetic Pole is actually a magnetic south pole and the Earth's South Magnetic Pole is a magnetic north pole.
In British English, if you intentionally give something the same name as a particular thing, you say that you name them after that thing. Saying that the north pole of a compass was named after the Earth's north pole may be correct, but I think the history of the name shows the confusion.
However, I appreciate your thoughts on the matter.
Changing distance and mass of objects
October 22, 2016
What happens to the gravitational force between two objects of equal mass if the distance between them is doubled?
What happens to the gravitational force between two objects if one mass is doubled and the distance between their centers is held constant?
Shoko - USA (27405)
According to the equation F = GMm/R^2, doubling the distance between their centers would result in 1/4 the force. Likewise, the force of attraction would double if one mass was doubled.
Charge created when rubbing materials together
October 16, 2016
What charge will be created on following bodies when we rub them against each other
1-metal vs metal
2-insulator vs insulator
3-metal vs insulator
israr khan - Pakistan (27384)
Much depends on which metals and insulators are used. See Materials that Cause Static Electricity for a list of materials and how well they attract or give up electrons.
Are subatomic particles matter?
October 15, 2016
I know this was from a LONG time ago, but I was just wondering about something that I couldn't figure out.
Would subatomic particles be considered matter? I was talking to someone who said that there was no matter before the Big Bang, which is true; there were no atoms. So would subatomic particles have existed?
Rumaisa - Canada (27383)
Matter is defined as something that has mass and takes up space. Certainly subatomic particles fulfill that requirement. A light "particle" photon does not have a rest mass, even though it had momentum. Thus it is not considered as matter.
The Big Bang Theory states that matter was highly compressed to almost infinite density. When the energy was released, subatomic particles and then protons, neutrons, and electrons were formed. Astrophysicists have various theories how that happened.
October 12, 2016
I was searching for some poker information today and I came across your resources for winning at competition
Anyway, I couldn't help but notice that you mentioned playwinningpoker.com but their site has been completely shut down for a while now.
You way want to remove their URL from your article.
My entire site is actually dedicated to providing success for poker players: http://www.beatthefish.com/
Might make a nice replacement on the page. :)
Either way, keep up the awesome work!
Josh - Canada (27365)
Thanks for letting me know. I checked the links and deleted two items with dead links. I added two new items plus your website at Competition Resources.
October 11, 2016
Cheeky me? I came across your page with helpful resources for authors and wondered whether you might be interested in adding to your list our infographic that offers alternative words to commonly used ones.
Jennifer - USA (27360)
Thanks for the resource. I added a link to Writing Resources.
Dry ice and water
October 11, 2016
dear sir/medam I want to know the time take liquid water to clod dry ice.. and process and how many water can be converted and full procedure of it!??
Ashraf - India (27361)
Dry ice is not made of water. See: Dry Ice is the Solid State of Carbon Dioxide.
Dry ice is made by cooling and compressing CO2 gas.
Needs handle for Dine Rite cookware
October 11, 2016
Do you know where I can find long pot handle for Dine Rite waterless cookware? Bought them in 1973
Lizabeth - USA (27364)
I have no listing of the Dine Rite company. The company probably went out of business in the past 43 years.
You might try local repair shop or cookware store to see if you can use some generic handle.
Best wishes in getting your cookware fixed.
Restaurant market segment in Mumbai
October 10, 2016
What is your prime market segment 7and target market segment for street food restaurant in mumbai
Sameer - India (27358)
You need to do research on the various street food restaurants in Mumbai. This will give you an idea of the competition and what they have to offer, as well as their prices.
Then decide on the market segment or people you want to appeal to. This will help in defining your service.
Adding two fractions
October 9, 2016
what is 2/5 + 1/2
Gane - USA (27355)
To add 2/5 + 1/2, you find the lowest common denominator, which would be 5 x 2 = 10.
Then change each fraction to have the same denominator: 2/5 = 2*2/5*2 = 4/10 and 1*5/2*5 = 5/10.
Finally: 4/10 + 5/10 = 9/10.
Follow a similar routine for adding other fractions.
Are electrons in orbit a theory?
October 7, 2016
Hello, this is Suren with a question. So the quantum theory and electrons orbiting the nucleus and nucleus consisting of protons and neutrons is just a theory? How sure are we scientifically that this is the way it is. And hadron collider proving even smaller elements like bosons, leptons and so on, how accurate are all these that we talk about. Thank you.
Suren - USA (27351)
Electrons do exist in shells around the nucleus. However, they have been found not to be small objects but as a cloud or waves of material. See Structure of the Atom.
As far as bosons, leptons, etc, see Fundamental Particles of Matter for information.
Dirty playing in high school football games
October 7, 2016
How do I address? My son is a football player for Galileo high school. He told me that he was down and the guy from Lowell high school keep knee him. It happened that we have it on tape! Should I will to my son's coach!
If now I will show the take to other school coach. And in the previous game, one of the players was down and they punched him three times. He up holding a punch but didn't happen! These never experience this!
We want them play a good game! Good sportsmanship! It is sad the coach lets they players play like that! I am sure this is not the first time! I want to address this!
Marie - USA (27352)
Unfortunately, some coaches allow their players to to play dirty and show poor sportsmanship. However, it is the job of the referees to flag dirty playing and penalize the other team or even throw the player out of the game. It is their job to make sure the players don't get injured by such dirty playing.
It is good that you have a tape of the incident. You can show it to your team's coach and also to the school principal. They should be concerned about such dirty playing. Also, other parents in your school should be concerned, because they don't want their kids to get hurt by such dirty playing.
I hope you will be able to get some action on stopping this activity. Let me know how things turn out.
Wants to avoid having sparks ignite gasoline
October 6, 2016
My son is doing a science experiment and he is trying to find out which materials will not create a static spark of which one could make a gas fuel pump with. In rare cases the spark sets off a explosion. You list the things on your site that create the most static charge but do you know what will create the least when touched by the human hand?
scott - USA (27350)
Dry human skin tends to give up the most electrons, while polyester tend to gain the most electrons. That is why wearing polyester clothes or rubbing shows on a polyester rug can create enough charges in a person to create a spark when discharged on some metal object.
Pick materials on one list or the other to be safe. For example, glass and aluminum might be a good combination. Also, steel doesn't collect many charges.
Look at what most small gas fuel pumps are made of to see good materials to use. Also, when dealing with gasoline, it is a good idea to be grounded. See Controlling Static Electricity for information.
Best wishes for success in your son's experiment.
Could the Universe be inside a living being?
October 5, 2016
Hi, thanks for the article.
My question is....
If the universe as we know it is expanding. Could this be because we are in fact inside a living being? Which obviously would grow throughout its lifetime. And if this is the case, is there a possibility of other universes existing in non living items such as plastic? Which is man made therefore making the maker of such items god? An unaware god?
I'm more spiritual than religious but I do believe that if is a cetiant being at the heart of all this ,it would make more sense for us to be here by an unintended design rather than god getting out his tool box and making the universe on purpose.
I have more questions but i am in danger of going on a tangent, so I'll end here.
Thanks in advance for your much valued opinion on this.
Jim - UK (27347)
You pose a number of interesting questions. It is good to speculate on them and perhaps to have some theories. But of course, we can't know for sure.
As far as the Universe expanding goes, see Big Bang Theory and Religion for some views on that.
Also see Theory of Multiple Universes (Multiverse) to look at that concept.
It is possible that our Universe exists in some "living" being or object. However, growth as we know it, consists of adding cells. It the Universe was a "cell", it wouldn't be expanding but instead multiplying.
These are all interesting thoughts.
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