Each day readers send in questions and feedback concerning the various lessons in the School for Champions website. A total of 15710 letters have been answered. They are listed according to date.
You can read them to further your understanding of the subjects.
|References on electrostatic painting||Physics||Static Electricity||Egypt|
|What do the signs mean||Physics||Gravitation||Australia|
|Difference in echo times||Physics||Sound||Tanzania|
|Electricity for water heater||Physics||Electricity||USA|
|Noise comes on every day||Physics||Sound||UK|
|How do electromagnets work in railway signals?||Physics||Magnetism||India|
|I don't understand Astronomy at all||Astronomy||Canada|
|Is zero a variable?||Algebra||India|
|Unmarked saucepan needs fixing||Health||USA|
|Water pressure when stones added to a pool||Physics||UK|
|How can I become a champion?||School for Champions||Zambia|
|Have article on speaking||Speaking||USA|
|How does pressure affect a liquid?||Physics||Fluids||Ghana|
|Placing electromagnet inside another electromagnet||Physics||Magnetism||USA|
References on electrostatic painting
February 20, 2017
I am Working on A project On High Voltage Engineering and i need any Reference talking about Electrostatic Painting
Mahmoud - Egypt (27892)
Some websites explaining the basics of electrostatic painting are:
Electrostatic Spray Painting Basics Explained
How Does Electrostatic Spraying Work?
I hope that helps. Best wishes for success in your project.
What do the signs mean
February 19, 2017
Hey I'm Aric and I'm trying to work out the gravitational attraction between the Sun and the Earth for homework
I just wanna know what the times, divide, plus and minus mean
Like as in;
* = Times?
/ = Divide/Fraction
- = Minus
and so on
Aric - Australia (27888)
The equation F = GMm/R^2 means G times M times m divided by R squared or R times R.
To answer your question:
a*b means a times b or multiply a times b
a/b is a divided by b
a - b is a minus b or subtract b from a
The big thing is to find the mass of the Sun and of the Earth, as well as the distance between them.
I hope that helps. Best wishes in getting the problem solved.
Difference in echo times
February 19, 2017
a helcopter is hovering at an altitude of 200 m above the surface of a lake. a speaker on the helcopter is sending out soundwaves,which are reflected from both the surface of the water and the bottom of the lake. if the difference in arrive times of the two echoes is measured tobe 0.24s, what is the depth of the lake?
(the atmopheric temperature is 20centgreds)
Toroma - Tanzania (27890)
Most of the sound would be reflected at the surface of the water. Only a very small amount of the sound would go into the water. Also much of the sound would be reflected at the surface when trying to go back into air. In other words, the amount of sound reflected off the bottom of the lake probably could not even be detected.
The speed of sound in air is 343 m/s. So, it would take 200/343 = 0.58 seconds for the sound to go from the water to the helicopter.
The speed of sound in water is 1484 m/s. The sound would have to go to the bottom of the lake and then back up, and then it would take 0.58 s to reach the helicopter. For the difference to be 0.24 s, the depth would be 1/2 of 1484 * 0.24 = 178.08 m.
I hope that helps.
Electricity for water heater
February 19, 2017
I just found that I have current in the system from the hot wire of the water heater to ground . On one 110 with it removed from the breaker I get a reading of 1.7 volts to ground. The other reads .8 volts to ground. We went to checking because the power bill has been high and though that the water heater might have gone back. This is a older home and has had several changes over years. What would be the best way to find out what is going on.
Thanks for you help
Ben - USA (27891)
Often older homes have their electrical wiring installed or fixed incorrectly. I'm not sure how you could get readings of only 1.7 volts unless you have your voltmeter set wrong or the voltages are not for heating the water.
Although you probably hate to spend the money, it is best to get an electrician take a look at things. There may be some other reasons your power bill has been high, especially if the increase is recent.
Best wishes on solving your problem.
Noise comes on every day
February 16, 2017
Dear Sir, please can you help me with this.
I have a building site across the road from my house.
I arrived home one day to a sound which was like my washing machine emptying out.
Since then the sound has changed. The Council monitored low voltage sound waves in the house and a sound consultant monitored 40 to 60 hertz.
Could it be that instead of hearing something emptying I actually heard something being connected to my pipes.
The sound now changes at the same time every day and I get brief interference on my TV at this time.
My main problem is that it gives me headaches and hurts my ears.
Could this be from a drainage/sump pump? Please can you give me some advice. Thank you.
Ann - UK (27884)
I am sure such a noise would be annoying to you. If they are building something across the street from your house, it could be that they are turning on some equipment at the same time each day. They fact that your TV has brief interference points to some electrical switching on or off.
It would be worthwhile to go to the building site and ask if they turn on some equipment at that certain time. This could give you a clue as to the cause of the noise.
It is possible that they have something connected to water or sewage pipes that reach your house. It could be some vibration from equipment pressing against the pipes or even pumping or draining from the pipes.
You might have to ask a few people there, and hopefully someone will give you a clue as the the cause of the noise.
I hope that helps in solving your problem. Best wishes for getting rid of that noise.
February 15, 2017
I just found your website! In particular, I enjoyed browsing through your Entrepreneurship resources.
It's great that there is also some information about starting an online store. Do you think it would be helpful to also include other ecommerce providers than just Shopify? We have a ranking table of various providers on our site. If you believe that this could be useful to your readers feel free to add it to the list.
Best of luck with your project!
Robert - USA (27881)
How do electromagnets work in railway signals?
February 14, 2017
How electromagnet works in railway signals?
Harsh - India (27879)
Railway signals can be flashing lights or a moving barrier.
An electromagnet could be used as a solenoid to turn on or turn off the railway signals.
The barrier is usually moved by an electric motor.
I don't understand Astronomy at all
February 14, 2017
I don't understand Astronomy at all. I don't enjoy studying about a whole new world that I've never visited. Is their an easy way to understand Triangulation, Radio telescopes?
Jawerriya - Canada (27880)
It can be interesting to look into the night sky and see all the numerous stars in the sky, as well as their movement throughout the year. Some people like to learn the constellations and arrangement of the stars.
However, Astronomy can delve deeper to find out what the planets and stars are made of. It is a scientific study that some people are interested in and others are not.
Triangulation is a method to determine distance using trigonometry. In Astronomy, it is useful to approximate distance of far-off objects.
A radio telescope uses radio waves instead of light ways to detect distant objects in space. In some situations, it works better than visible light.
Although teachers can often learning many facts without making the subject interesting, it is good to find things about the subject you like.
Best wishes for success in your studies.
Is zero a variable?
February 13, 2017
0 is variable or constant
Chandra - India (27877)
Since zero (0) does not change, it is a constant and part of the number system.
Unmarked saucepan needs fixing
February 10, 2017
I have a double boiler saucepan 2-3 qt with no brand mark. It's heavy and appears to be waterless. There is a circle on inside bottom of pan. The lid is Saladmaster and fits well. Did Saladmaster make a pan not branded??
Also missing handles on both pieces and the rectangular metal stub that handle fits onto is 1/2" x 3/4". The handle from the marked Saladmaster pan that came with this unmarked one fits on either pan. Need to know a possible brand so I can order handles to replace them.
Diane - USA (27873)
It is unlikely that Saladmaster would not have a brand mark on their cookware.
You can try to order parts from Saladmaster Parts. Personally, I would check into getting a new saucepan instead of trying to fix the old one.
Water pressure when stones added to a pool
February 9, 2017
Ron, Thanks for your article. what happens to water pressure if some of the water is removed and replaced by stones. In a pool. I think the water pressure at bottom of pool is reduced.
Kieran - UK (27870)
Water pressure is caused by the weight of the water above the point of measurement. If the pressure is measured in grams per square cm, it would be the weight of the column of water 1 square cm times the height.
This would be true for water pressure at the top of the stones. Since the distance to the surface is reduced, the water pressure would be less at that point than at the bottom with no stones.
How can I become a champion?
February 6, 2017
how can i become a champion
Saviour - Zambia (27858)
Just wanting to become a champion is a good start.
Consider areas that you have great interest in and are good at. Then seek to do your best in those areas. This will build your confidence.
While you are seeking to achieve your goals, use your skills to help others achieve their goals. This will make you a champion to them.
Continue to study and to excel. I know you will succeed and become a champion.
Have article on speaking
February 6, 2017
Love the website, keep up the good work.
I enjoyed reading your article about Public Speaking below:
I've written a 5,000-word article on becoming a better public speaker on my blog that builds on that post in more detail. In addition, I also filmed a 40-minute in-depth complimentary video on public speaking to go with it.
I believe it will be relevant to your audience, let me know if you would like me to send it to you.
Ian - USA (27859)
I can add a link to your website and video. Let me know the links.
How does pressure affect a liquid?
February 6, 2017
Give 3 ways on how pressure acts on liquid
Adu - Ghana (27860)
Pressure acts on a liquid in all directions. Pressure can also increase the temperature. Pressure only decreases the volume a small amount, if at all. Likewise, the temperature that the liquid changes to a solid is only slightly affected by pressure.
Placing electromagnet inside another electromagnet
February 5, 2017
I have a new found curiosity for electromagnets. I'm not a scientist or even a student... just curious. What would happen if your electromagnet core contained another electromagnet?
Ron - USA (27857)
If the core is movable, you would have a solenoid of sorts. (See Solenoids are Electromagnetic Devices).
Instead of having a movable iron core or magnet core, you would place an electromagnet there. This would allow movement of the core to be finely tuned. However, I don't think I've even seen such a configuration.
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