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Feedback Blog

Each day readers send in questions and feedback concerning the various lessons in the School for Champions website. A total of 14745 letters have been answered.



List of most recent 15 letters

Title

Subject

Country

Buying device on eBay from Italy Physics Australia
 
Derive Doppler Effect equations Physics Pakistan
 
Factors in finding demand for a business Entrepreneurship UK
 
Everything about chemistry School for Champions Nigeria
 
Seeking chemistry carrer in Tanzania Career Tanzania
 
Fundamental units Physics Pakistan
 
Calculate the resistance force on an incline Physics Malawi
 
Newton's Second Law in terms of momenttum Physics South Africa
 
Website is really nice Thanks USA
 
Reducing temperature of steam Physics USA
 
Raising temp of 5 lb of water from ice to 82 degrees Physics USA
 
Is slang like a verbal virus? Communication Uganda
 
Which needs to expend more fat to stay warm? Physics Kenya
 
Risks in using a transformer Physics South Africa
 
Want to learn more about speaking Speaking USA
 

Next 15 letters


Buying device on eBay from Italy

Physics

October 28, 2014

Question

I am considering buying a MiniDisc combo deck on Ebay,from Italy. Their current is 230 volts at 50hz.In Australia we have 240 volts at 50hz.Will the unit function properly in Australia,on 240 volts? Dennis Moore.

Dennis - Australia (25482)

Answer

There is about a 10% variation in the designated voltages, so the difference between 240 VAC and 230 VAC should not be a factor. However, you do need to make sure the Italian outlet plugs will fit in your Australian outlets.

See Electricity in Italy for pictures of their outlet plugs. You would probably need some sort of adapter to fit your outlets.

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Derive Doppler Effect equations

Physics

October 26, 2014

Question

how we derive the equation of doppler effect?

mumtaz - Pakistan (25479)

Answer

See Derivation of Doppler Effect Wavelength Equations. It also provides links to the derivation for frequency and velocity.

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Factors in finding demand for a business

Entrepreneurship

October 25, 2014

Question

what are the factors that decide the demand of a business? for example lets say wedding planner. considering the needs of goods and service and the price of goods and services

tatenda - UK (25477)

Answer

Being a wedding planner is essentially going into business for yourself. The first thing to do is to check the competition to see how many are in your area. This gives an idea of the demand for the service.

Also, you can get some estimates on what they would change for setting up a wedding.

In starting up a business, it is always a good idea to get some hands-on experience. You can ask if they need some temporary help. Of course, if you tell that you want to start a competing business, they may not cooperate.

Being able to add something special or unique to an event can make it more appealing than the ordinary businesses.

I hope these ideas help. Best wishes for success in starting up your business.

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Everything about chemistry

School for Champions

October 25, 2014

Question

Chemistry from beginning to the end

francis - Nigeria (25478)

Answer

See Chemistry for helpful beginning lessons.

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Seeking chemistry carrer in Tanzania

Career

October 23, 2014

Question

HOW CAN I SUCCEED IN CHEMISTRY AM STUDYING DEGREE OF CHEMISTRY FIRST YEAR MY DREAMS TO WORK AT INDUSTRY HOW CAN I ACHIEVE MY GOAL BASING IN CHEMISTRY

Roda - Tanzania (25473)

Answer

While you are studying Chemistry, it is worthwhile to investigate companies doing chemistry work and chemistry jobs available in Tanzania.

Some companies will hire students as interns during the summer months. That is a good way to gain possible employment when you finish school.

The chemistry department in your school should have a listing of such companies. Also, your can check the want ads to see what companies in your area are looking for.

The website Chemist Jobs in Tanzania has only a few listings, but it can give you ideas. Also see Chemist Grade II Jobs in Tanzania for government openings.

Also see MyWage - Tanzania for some information.

I hope this helps you get a start on your career. Best wishes for good grades in school.

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Fundamental units

Physics

October 22, 2014

Question

my question is please can you tell me what is the fundamental unit of direct current and fundamental unit of alternating current?

amina - Pakistan (25469)

Answer

There are three fundamental units for AC and DC electricity. Current is measured an amperes (also called amps), voltage is measured in volts, and resistance is measured in ohms.

These fundamental units are related by the equation: V = IR.

AC electricity has another factor: frequency.

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Calculate the resistance force on an incline

Physics

October 22, 2014

Question

how can you calculate the value of resistance force(maximum friction force ) on an inclined plane?

- Malawi (25472)

Answer

The equation for the resistance force of friction on an inclined plane is:
F = f(r)*W*cos(a), where f(r) is the static coefficient of friction of the materials, W is the weight of the object, and cos(a) is the cosine of the angle of inclination (a).

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Newton's Second Law in terms of momenttum

Physics

October 21, 2014

Question

State newton second law in terms of momentum in words

mondli - South Africa (25466)

Answer

Newton's Second Law states that the force on an object equals its change in momentum with respect to time.

The change in momentum with respect to time equals the mass times acceleration.

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Website is really nice

Thanks

October 20, 2014

Question

I'm not that much of a online reader to be honest but your site is really nice, keep it up! I'll go ahead and bookmark your website to come back in the future. All the best

matt - USA (25461)

Answer

Thanks for the comment. Best wishes for success in your endeavors.

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Reducing temperature of steam

Physics

October 20, 2014

Question

A pressure cooker has 500.0 grams of steam in it at a temperature of 123.0 oC. In order to drop the temperature of the steam to 101.0 oC you would need to absorb ____ calories of heat energy,What formula do I use to figure this out?

Phoebe - USA (25463)

Answer

1 calorie is the change of 1 gram for 1 degree C.

Thus changing 500 grams 20 degrees C would require absorption of 500 * 20 = 10,000 calories.

This is assuming the pressure in the cooker remained constant.

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Raising temp of 5 lb of water from ice to 82 degrees

Physics

October 19, 2014

Question

raising temparture of water in btu

question . 5 lb of ice at 32 degrees how many btu to raise water temp to 82 degrees.

please help me with this .I thought answer would be 720 btu is this
correct?

david - USA (25458)

Answer

It takes 144 BTU to melt a pound of ice. Thus 5 X 144 = 720 BTU to melt 5 lbs of ice.

But also, it takes 1 BTU to raise the temperature of 1 lb of water 1 degree F.

Once the ice is melted, it would take an additional 5 x 50 BTU to raise the temp of 5 lb of water from 32 to 82 degrees.

Thus, the answer should be 720 + 250 = 970 BTU.

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Is slang like a verbal virus?

Communication

October 19, 2014

Question

Are slangs also considered as verbal viruses?

Eudu - Uganda (25459)

Answer

The expression "verbal virus" is actually a slang expression. Verbal virus really means a meaningless filler word--such as "um" or "ah"--that a person will habitually use.

Slang is an informal expression that a group of people may often use.

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Which needs to expend more fat to stay warm?

Physics

October 16, 2014

Question

between a cow and a rat, which one will have to convert the greater fraction of its fat to stay warm on a day of extremely low temperature. explain

warsame - Kenya (25454)

Answer

Heat loss is a factor of surface area. A cow has greater surface area.

Insulation is a factor of hair or fur length. I think a rat has thicker fur than a cow.

For those two reason, it would seem that the cow needs to expend more energy or fat to stay warm.

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Risks in using a transformer

Physics

October 15, 2014

Question

1. what are the risks/problems of using DC and AC Transformers?
2. what does the two transformers used for? (DC and AC Transformers)

Tonia - South Africa (25450)

Answer

If you use the a transformer indented for lower voltages with a high voltage input, it could overheat or blow out.

Transformers are used to change the voltage to make it more usable.

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Want to learn more about speaking

Speaking

October 15, 2014

Question

I want to learn more about public speaking

Elvira - USA (25451)

Answer

You can look over our lessons. Also, a good place to start is through Toastmasters and by attending some local Toastmasters Club meetings. They provide a chance to learn speaking and to practice it.

Find a club in your area.

Best wishes in your public speaking.

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