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Answers to Readers' Questions on Physical Science:

Using Mathematics

The following 4 comments and questions have been sent in. They are listed according to date.

List of first 10 items

• Difficult to grasp this knowledge
• Help me learn Electrical Engineering
• How did you get the square root?
• How to calculate acceleration and velocity?

Next 10

Difficult to grasp this knowledge

Question

March 15, 2008

It was very difficult for me to grasp this knowledge in my secodary years in my school and now just by reading this material on your website has given me something unique i would very much love to share it with you

the second question

If x = 3, what does 2*x² equal?

x2= 3 multiplied by 3 = 9

then 2*9= 18

if i am wrong in my equation then theirs something wrong with me from day one because in my secondary education my results suffered greatly. and i am 22 now

Salekh - UK

15543

Answer

What is important in mathematics is being able to go through the logic of a problem step by step.

I think your method of solving the problem was very good and the answer looks correct to me.

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Help me learn Electrical Engineering

Question

April 7, 2007

Please what are the easy way to understanding mathematics,if you are studying Electrical Electronic Engineering?,secondly how can one calculate a circuit with there components?.

Please i want you to help me by giving me the websites of any institution doing online course on Electrical Electronic Engineering,because i have great passion for this course.please i beg you to help me in the name of God.Thanks.

Dennis - Nigeria

13504

Answer

You can get a good overview of all the aspects in Electrical Engineering from:
http://en.wikipedia.org/wiki/Electrical_engineering

The site also has many references.

Another good source is at:
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/etroncon.html

Unfortunately, online courses in Electrical Engineering are from colleges that charge a large fee to participate.

I hope that helps, and best wishes in your studies.

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How did you get the square root?

Question

January 14, 2006

how did you get the answer 6 on SQRT(36)
please explain!!

sarah - USA

9667

Answer

The square root of 36 or SQRT(36) is the number times itself that equals 36. In many cases, you can guess. 6 times 6 = 36. Likewise, the square root of 25 is 5.

But for other numbers that don't come out even, you need to use a scientific calculator. See the lesson on Using a Scientific Calculator at:
http://www.school-for-champions.com/science/calculations/using_calculator.htm

It is listed in the Science lessons.

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How to calculate acceleration and velocity?

Question

December 7, 2005

I was wondering how to find out a way to calculate acceleration and velocity?

Hunter - USA

9287

Answer

Velocity is the distance an object travels divided by the time it take to go that distance.

Acceleration is the change in velocity over a given distance divided by the time it take to go that distance.

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