question and anwers 1) what is meant by a physical quantity? . how the physical quantities are organized in SI 2) write the steps to follow to mesa sure a physical quantity. 3) what are the fundamental physical quantities? 4) write the relation between P,N and U.
Answers
1.
A physical quantity is a property of a material or system that can be quantified by measurement. For example, the physical quantity mass can be quantified as n kg, where n is the numerical value and kg is the unit.
2.
Step 1: Choose an appropriate scale. E.g. 1cm : 1N.
Step 2: Measure the angle between the two vectors you are adding.
Step 3: Move one of the vector to join up with the other vector in a head to tail fashion taking care the angle between the two vectors measured earlier is not changed (arrow head of one vector joins to the tail of another vector).
Step 4: Draw the resultant force from the tail to the arrow head of the two joined vectors forming a complete triangle.
Step 5: Measure length of this resultant vector and convert using the earlier scale to get the magnitude of this resultant force. (e.g. 7cm corresponds to 7N using the earlier scale of 1cm : 1N).
Step 6: Measure also the angle between this resultant force and any of the two vectors so that the resultant force can be described both in magnitude and direction to either of the two forces.
3.
The quantitative concepts used in mechanics can be classified into two groups, one known as the fundamental concepts con- sisting of three quantities, length, time, and mass, which form the bases of mechanics, and a second group known as the derived concepts consisting of the other quantities used in mechanics.
Sorry but I dont know 4th answer