Weekly Feedback Blog
Each day readers send in questions and feedback concerning the various lessons in the School for Champions website. A total of 11827 letters have been answered.
Although you can access the questions and feedback from the specific lessons, this blog is a listing of 12 letters answered during the week from today (3/12/10) to 7 days ago (3/5/10).
You can also select another week to view.
List of letters
Date |
Title(Click to jump to item) |
Subject |
Topic |
| 3/5/10 | Frequency and wavelength of light | Physics | Dispersion of Light |
| 3/5/10 | I want to make a magnetic train | Physics | Magnets |
| 3/5/10 | Wants to teach others public speaking in Kenya | Speaking | General |
| 3/6/10 | Salt can dissolve in water but sand cannot | Chemistry | Solutions |
| 3/6/10 | Are DC transformers available in the market? | Physics | AC Transformers |
| 3/6/10 | Stained cookware with coffee pot cleaner | Health | Waterless Cooking |
| 3/6/10 | Do rolling and static friction occur at the same time? | Physics | Friction |
| 3/7/10 | Why is quality service important in a restaurant? | TQM | Restaurant Quality |
| 3/9/10 | Information on TQM quite helpful | Thanks | TQM |
| 3/9/10 | I want to start my own firm | Business | Starting Business |
| 3/9/10 | Who determined gravitation equation? | Physics | Gravitation |
| 3/10/10 | Worried about quivering and trembling | Speaking | Fear |
You can also select another week to view.
Details of letters
Physics - Dispersion of Light
Frequency and wavelength of light
March 5, 2010
Question
Hi, I am scientist researching on astronomy and deep space. I would like to ask you following queries;
1) What is the role of frequency and wavelength in the propagation of light and sound waves?
2) If the frequency is kept constant, the change in wavelength will result in what observations of light/sound. Will it change colour?
3) If the wavelength is kept constant then the change of frequency will affect in the propogation of light/sound in what way? Will it change colour?Baldevkrishan - India (19330)
Answer
Frequency times wavelength equals the speed of the waveform. However, sound does not travel in space, since matter is required for its propagation.
When light passes thought a material that changes its velocity, and its frequency is constant, the wavelength or color would change. The only way to change frequency is at the source of the sound or light.
Physics - Magnets
I want to make a magnetic train
March 5, 2010
Question
i want to make magnet train. which without will drive electric. magnet of n and s.
Satish - India (19331)
Answer
To learn about Maglev trains, see: http://www.o-keating.com/hsr/maglev.htm
Also, for an experiment, see: http://www.coolmagnetman.com/magtrain.htm
Speaking - General
Wants to teach others public speaking in Kenya
March 5, 2010
Question
Thanks for this noble project you have undertaken, my main interest is to know how to speak publicly and how I can train more Kenyans people on the same especially pastors since I work with a church
organization.
thanks
Munga SIMON
KCGMSIMON - Kenya (19332)
Answer
If you live in or near Nairobi, you can get involved with the Toastmasters Club. They have an excellent and inexpensive program for learning speaking skills. They can also help in starting a club in another community.
Check the website for contacts:
http://reports.toastmasters.org/findaclub/searchresults.cfm?Country=Kenya&State=&City=Nairobi
or start from http://reports.toastmasters.org/findaclub/ and enter Kenya.
Usually, a person starts giving a short 5-minute speech on a topic of interest to the audience. Then he moves up to longer talks. You might be able to speak to small groups in your church to build your skills.
However, it would be best to go through a program like Toastmasters. If you are not near Nairobi, at the very least contact the clubs and ask for advice.
Best wishes in becoming a good public speaker.
Chemistry - Solutions
Salt can dissolve in water but sand cannot
March 6, 2010
Question
my questionis that can you explain with simple diagram the meaning of the following statment .salt can dissolve in water but sand cannot.
ahmad - UAE (19334)
Answer
Salt is sodium chloride (NaCl). When it is in water, the sodium and chlorine atoms separate and float around among the water molecules. Thus, the salt has dissolved and the crystals can't be seen anymore.
On the other hand sand is silicon dioxide (SiO2). Water has no effect on it, so it just sinks to the bottom.
An image of that is at:
http://www.yellowtang.org/images/salt_dissolves_wate_c_la_784.jpg
Physics - AC Transformers
Are DC transformers available in the market?
March 6, 2010
Question
P/s solve my doubt..
DC Transformer available in the market.VIBIN - India (19335)
Answer
There are a number of types of DC transformers. For a listing of companies selling such products for your specific needs, see:
http://www.thomasnet.com/products/transformers-dc-to-dc-87060307-1.html
Health - Waterless Cooking
Stained cookware with coffee pot cleaner
March 6, 2010
Question
I have used my mother's old Guardian Service cookware for years. They have always cleaned up very well and the dishwasher never stained the pans. Recently, I poured (by mistake) the coffee pot cleaner in the the spot where the spot cleaner goes in my dishwasher. My Guardian pans came out with a very dark stain and so did my recently I purchased cake pans.
What can I do to get rid of the dark stains, and is it OK to use the Guardian cookware if it is stained?Sue - USA (19336)
Answer
The stain should not be harmful. It just doesn't look good. Here are some websites with tips on cleaning your cookware:
http://housewares.about.com/lw/Food-Drink/Cooking/Tips-for-Cleaning-Stainless-Steel-Cookware.htm
http://www.thriftyfun.com/tf94831679.tip.html
I hope that helps.
Physics - Friction
Do rolling and static friction occur at the same time?
March 6, 2010
Question
When a car moves forward, there is a static friction acting on the tire, because the tire is instantaneously in contact with the road. Once the rolling starts, there is a rolling friction acting on the tire. Does this mean the two types of friction act on the tire in the same time?
- USA (19339)
Answer
Static friction at the point of contact helps cause the wheel to roll. Without it, the wheel could just slide. Rolling friction can be complete. With tires, there is also an effect in rolling friction caused by distorting a soft tire.
See: http://www.school-for-champions.com/science/friction_rolling.htm
TQM - Restaurant Quality
Why is quality service important in a restaurant?
March 7, 2010
Question
Please! I would like to know more about the quality service.my question is why the service in a restaurant is more important than food?? I want get more information about that. thank you for understanding.
Timoteo - Panama (19340)
Answer
Although good food is very important to customers in a restaurant, if the service is poor or rude, they will probably not come back or recommend the restaurant to others.
However, if the food is mediocre but the service is efficient and pleasant, the customer can feel the meal was relaxing and enjoyable, even if the food was not that good.
Obviously, you want to have both good food and good service. Some restaurant owners forget that the customer wants an enjoyable experience while eating their meal.
Consider other restaurants in your area and rate them on both the quality of the food and quality of the service. Being a customer is a good way to see what is important in going to a restaurant.
I hope that helps you in your business.
Thanks - TQM
Information on TQM quite helpful
March 9, 2010
Question
The information on TQM are quite helpful.
ThanksMcKnight - Nigeria (19344)
Answer
I am glad the information was useful to you. Best wishes for success in your endeavors.
Business - Starting Business
I want to start my own firm
March 9, 2010
Question
Please I want to start my own firm, will like to be an agent for clearing and forwarding of goods, contract executions, and lands & properties,
Tamunotonye - Nigeria (19345)
Answer
In starting a business, it is always good to have experience in the type of work your would do by working for a company that does that work. Besides getting the experience, you will find out what other companies are the competition.
You can also make personal contacts for future work. Getting the first contracts are often the most difficult. Sometimes, after working for a company, they can become your first customer.
Write out a plan of action of exactly what you will offer, why it is better than the competition, who will be your customers and how you will get your first contracts. You need to have an idea of how much money you need to get started and how long it will take to make a profit.
Starting up a firm is not easy, but it can be very lucrative if done correctly.
Also, see our section on Entrepreneurship at:
http://www.school-for-champions.com/entrepreneurship.htm
Physics - Gravitation
Who determined gravitation equation?
March 9, 2010
Question
PLEASE ADVISE,
WHO DETERMINED THE EQU F =GMm/RxR AND IN WHICH LABORATORY.
THANKS
PETER BECKPETER - UK (19347)
Answer
Isaac Newton formulated the equation F = GMm/R^2 in the UK in 1687. However, British scientist Robert Hooke claimed Newton got the equation from him.
They both were involved in the Royal Society. I don't think they have any formal names for their laboratories or if they even had labs.
Speaking - Fear
Worried about quivering and trembling
March 10, 2010
Question
Do you have any tips for controlling voice quivering and trembling at the hands and knees? I am fourteen and I am giving a speech in front of my class tomorrow, but even after reading your article, I am still a bit unsure of myself.
Krystal - Australia (19353)
Answer
Practice giving the speech in front of your parents or friends. This is a real audience, and will assure you know what you will be saying. Have some notes, just in case you get stuck in the speech.
Before you talk, picture all the other students being anxious to hear what you have to say. That is what a speech is all about.
When you start your speech, aim it at either the teacher or at some friend in class. Once you get comfortable, it should be easier to look at the other students.
Don't worry about quivering and trembling. Most of the others won't notice it as much as you do. However, if things get too bad, there is nothing wrong with cutting your speech short by simply saying, "And that concludes my speech."
I am sure that you will do fine. Practice a little and then do a fantastic job.
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