Feedback Q&A on Physical Science Basics

by Ron Kurtus

A total of 41 comments and questions have been sent in. They are listed according to date.

List of most recent 10 letters

Country

Fundamental Units of Measurement What is mechnical designing? USA

Fundamental Units of Measurement Which is a fundamental unit? India

Using Mathematics Relatinship between math and science India

Become a Champion in Physical Science What is a redox reaction? South Africa

Fundamental Units of Measurement Why there are seven basic units? Pakistan

Jobs Using Physical Science Want to be an engineer RSA

Physical Science Overview I need help with the calculations South Africa

Using Calculator Solving problem using calculator UAE

Using Calculator Does not perform factorial of negative number USA

Champion Need help with syllabus on Physical Science South Africa

Next 10

What is mechnical designing?

Topic: Fundamental Units of Measurement

Question

July 2, 2015

Mechanical designing

nadir - USA

26148

Answer

Mechanical designing is one part of Mechanical Engineering, which is one of the largest, broadest, and oldest engineering disciplines.

Mechanical engineers design and manufacture machines and devices of all types. They also create the processes and systems used in technology and industry.

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Which is a fundamental unit?

Topic: Fundamental Units of Measurement

Question

May 31, 2015

Which of the following is a fundamental quantity. 1. Weight 2. Quantity of substance 3. Density 4. Area

Suchitra - India

26048

Answer

A fundamental unit is one that is not a combination of other units.

Weight is mass time gravity. Density is mass divided by area, Area is length times width.

The amount of quantity of a substance in chemistry is a mole and is considered a fundamental unit.

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Relatinship between math and science

Topic: Using Mathematics

Question

January 9, 2015

How Are Math and Science RelatION

sunil - India

25695

Answer

You can study the facts of science with little or no math. However, in many areas of science--like Physics, Astronomy, and Chemistry--equations are used to make calculations. In such cases, you need some knowledge or Algebra and Arithmetic to work with the equations and make the calculations.

Advanced science subjects may require knowledge of advanced math, such as Calculus.

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What is a redox reaction?

Topic: Become a Champion in Physical Science

Question

October 6, 2013

as i am a young i want your help can you explain for about redox reaction and how does it works? .i realy want to excell on physical science and i realy need ur help.

mthobisi - South Africa

24079

Answer

Redox reaction stands for a reduction-oxidation reaction. It is part of Chemistry.

It is a chemical reaction in which atoms have their oxidation state changed. It involves the transfer of electrons between different types of atoms or molecules.

One example is the oxidation of carbon to yield carbon dioxide (CO2). Another is the reduction of carbon by hydrogen to yield methane (CH4).

I hope this helps. Best wishes for success in Physical Science.

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Why there are seven basic units?

Topic: Fundamental Units of Measurement

Question

September 16, 2013

why there are seven basic units???

ahsan - Pakistan

24017

Answer

A committee of scientists decided on the seven units that are basic.

Time, length, and mass certainly are fundamental or basic units, since such measurements as velocity, force, and energy can be derived from them. Electrical current is said to be basic, resulting in a magnetic field.

However, I do not think temperature should be included, since it is a result of energy and thus is not basic.

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Want to be an engineer

Topic: Jobs Using Physical Science

Question

January 19, 2013

I'm doing science and I want to know that is physical science difficult. I have no idea of what's happening. I want to be an Engineer one day can I make it without dropping out during the years?

Nkanyiso - RSA

23135

Answer

First of all, you should decide on what type of engineer you would like to be. Some examples are chemical engineer, electrical engineer, and mechanical engineer. Each has their own requirements.

Physical Science gives an overview of Astronomy, Chemistry, Physics, and Geology. Your engineering course may require further study in those areas, as well as mathematics courses.

Look at college catalogs for the course required for the type of engineering you are interested in.

Don't even think about the possibility to drop out. If courses you take are too difficult, you can make adjustments to take courses that suit your skill and talent.

Best wishes on a successful career. I know you can do it.

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I need help with the calculations

Topic: Physical Science Overview

Question

August 29, 2012

I need help with the calculations. I'm writting in two months time, thank you in advance

sibahle - South Africa

22868

Answer

What sort of information do you need concerning calculations? In what area of Physical Science are you having problems?

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Solving problem using calculator

Topic: Using Calculator

Question

April 20, 2012

Hello,

I have a math examination coming up so I need answers quickly. I typed in an expression on my calculator, and I got the wrong answer to the question. When I checked my working, everything was correct. I then used my friend's calculator to type in exactly the same expression and I got the correct answer to the question, so there must be something I have to change in my scientific calculator. The expression was: ?21^2+15^2-2(21)(15)cos(98). The whole expression is under the square root sign incase it is unclear. The answer I should get when I type it into my calculator is 27.45. I got this answer using my friend's calculator, but when I used mine to type exactly the same thing,I got 333.(some decimal numbers).
Any help will be much appreciated. Can you please make the reply very easy to understand and clear because I not a genius with calculators.
Thank you very much,

Lukman - UAE

22600

Answer

Some scientific calculators allow you to enter terms in order. However, many aren't good at calculating complex expressions. Using the scientific calculator that comes with Windows, I started from the back of the expression. 98+cos= -0.139. Then multiply that times 15*21*2, resulting in -87.68... Change the sign to +87.68... and put that into the memory M+.

Clear C and calculate 15^2 = 225. + MR = to add it to what is in the memory 312.68, and put that into the memory MS.

Clear C and calculate 21^2, then + MR = 763.58

Now for some reason there is no square root in the Window scientific calculator, so you switch over to the Standard version (View Standard). Recall memory MR and SQRT = 27.45.

Now, it is very easy to make a mistake using only a calculator. I think it is really better to calculate the individual items write them on a paper.

Also, I assume the ? at the front of the expression was meant to be the square root sign.

I hope that helps.

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Does not perform factorial of negative number

Topic: Using Calculator

Question

March 14, 2012

Good Morning.

I was trying to calculate -5.25! and the calculator returned me a message error.

So, what about HadamardÂ´s Gamma function ?

Otherwise you could use the L-Factorial function.

Best regards,

Edgar - USA

22507

Answer

Thanks for the "heads-up" on the calculator.

Although the calculator is supposed to be scientific, it only covers the basic scientific functions. It will only do a positive integer factorial (n!).

Also, I noticed that the application is somewhat out-of-date. I'll try to get an updated version or remove it from the site.

If you are using Windows, it has a scientific calculator that will calculate -5.25! accurately.

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Need help with syllabus on Physical Science

Topic: Champion

Question

January 31, 2012

I need help with the old syllabus on physical Science plz help me

Denver - South Africa

22395

Answer

I'm sorry, but I don't have a syllabus on Physical Science available.

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