Solving Physics Questions: Scalars, Vectors, Displacement, Paths & More

[dido28]

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

 

[jtbell]

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.

 

[dido28]

that is what i said to the professor but he insist and told me that there is a difference

 

[the_emi_guy]

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.

 

[dido28]

believe me i will but for the rest any suggestions

 

[mfb]

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.

 

[Studiot]

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

 

[dido28]

tanks evryone