## concept in physics

hi everyone i'm in my first year of electronic engineering and i have some questions which the professor of physics gave us but more as research than homeworks and to be honest i really tried but i didn't found anythings so i'm here to asking for your help
1- what is the difference between: (A and B are vectors)
A+B
the addition of A and B
the sum of A and B
2-is it true that in physics we have only scalars and vectors as quantities ?
3-is it true that all quantities which have direction and magnitude are vectors ?
4-what is the difference between the displacement and the path ?
5-how using the significants figures contributed in the scientific development ?
6- if you have the time and space can you find all other variables in physics ?
7-acceleration has no scientific meaning , why ?
8-the body of human is an accelerometer ,why ?
9-the body of human is not a speedometer ,why ?
if you can give me the answers or just tell me where i can found them it will really help me
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Mentor
 Quote by dido28 1- what is the difference between: (A and B are vectors); A+B; the addition of A and B; the sum of A and B
In the version of American English that I use, they all mean the same thing. In the version of English used in your part of the world (wherever that is), perhaps there is a difference.
 that is what i said to the professor but he insist and told me that there is a difference

## concept in physics

 Quote by dido28 that is what i said to the professor but he insist and told me that there is a difference
Here is how you could respond to your professor:

Of course there is a difference between A+B and "the sum of A and B". The difference happens to be zero.
 believe me i will but for the rest any suggestions

Mentor
 Quote by dido28 2-is it true that in physics we have only scalars and vectors as quantities ?
Tensors.

 3-is it true that all quantities which have direction and magnitude are vectors ?
That question is bad. In mathematics, you can express everything as vector. It does not matter if it is meaningful.

 4-what is the difference between the displacement and the path ?
I would say that a path has a specific way to "make" that displacement, but that depends on the precise interpretation of the question.

 5-how using the significants figures contributed in the scientific development ?
The concept of significant figures can be nice to get a rough estimate of an uncertainty, but it is not used for serious scientific work.

 6- if you have the time and space can you find all other variables in physics ?
What does that even mean?

 7-acceleration has no scientific meaning , why ?
Of course it has.

 8-the body of human is an accelerometer ,why ?
Can you feel an acceleration?

 9-the body of human is not a speedometer ,why ?
Speed relative to what? See principle of relativity.
 I think the clue to the (A & B) versus (A + B) is to be found in your course subject as an electronic engineer. You should look up AND gates OR gates XOR gates and you will have your answer
 tanks evryone

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