Friday, June 4, 2021

Физика: SI - International System of Units, System of measurement

SI base units

The SI is founded on seven SI base units for seven base quantities assumed to be mutually independent, as given in Table 1.

Table 1.  SI base units
SI base unit
Base quantityNameSymbol
lengthmeterm
masskilogram      kg
timeseconds
electric currentampereA
thermodynamic temperature      kelvinK
amount of substancemolemol
luminous intensitycandelacd

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  1. SI base units
    The SI is founded on seven SI base units for seven base quantities assumed to be mutually independent, as given in Table 1.

    Table 1. SI base units
    SI base unit
    Base quantity Name Symbol
    length meter m
    mass kilogram kg
    time second s
    electric current ampere A
    thermodynamic temperature kelvin K
    amount of substance mole mol
    luminous intensity candela cd

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Kinetic Energy

A ball of mass m has momentum p . Express the kinetic energy of the ball in terms of m and p .    p 2 /(2 m )