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What are the standard units used to measure the magnitude of physical quantities in physics?
The standard units used to measure the magnitude of physical quantities in physics are the International System of Units (SI units). These include units such as meters for length, kilograms for mass, seconds for time, and newtons for force.
Why are there 7 fundamental physical quantities and not more?
The 7 fundamental physical quantities were chosen because they are considered independent and cannot be derived from other physical quantities. These 7 quantities (length, mass, time, electric current, temperature, amount of substance, and luminous intensity) form the basis for all other physical measurements in the International System of Units (SI). Additional fundamental quantities can be derived from these 7, making them sufficient for describing physical phenomena comprehensively.
Types of physical quantities?
Physical quantities can be broadly categorized as scalar or vector quantities. Scalar quantities have only magnitude, like mass or temperature, while vector quantities have both magnitude and direction, like velocity or force. Other types of physical quantities include derived quantities (obtained from combinations of base quantities) and dimensionless quantities (without units).
What are those derived quantities in units?
Derived quantities are physical quantities that are derived from base quantities through mathematical operations like addition, subtraction, multiplication, or division. These derived quantities are also represented in units based on the units of the base quantities used in their calculation. Examples of derived quantities include velocity, acceleration, and density.
What is the following units that can only describe scalar quantities?
Units such as meters, seconds, kilograms, and kelvin are examples of units that can only describe scalar quantities. These units do not have a direction associated with them and only quantify the magnitude of a physical quantity.
