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  • Where does $4\\pi$ come from in electromagnetism?
    The SI is a rationalized unit system, which means that in electromagnetic formulae, factors of $4\pi$ appear in radial formulae, while they don't appear in rectangular formulae
  • newtonian mechanics - What is G-Force? - Physics Stack Exchange
    The acceleration unit used is $\it {g}=9 81 \rm {m s^ {-2}}$, hence a value of 3 means 3 times the gravity acceleration, and a g -force of 3 g means the force created by an acceleration of 3 g
  • Units in gravitational constant $G$ - Physics Stack Exchange
    The first set of units is in fact equal to the second If you replace the Newton in the second expression by its definition in terms of kilograms, meters and seconds $$ 1 N = 1 \frac {\mathrm {kg ~ m}} {\mathrm {s^2}} $$ you recover the first expression The SI system has a number of basic units (meter, kilogram, second, ampere, kelvin, mole and candela) All other units are defined based on
  • Why does the metric system use kilogram as a base SI unit?
    The previous base unit, gram, was replaced by the kilogram in order to obtain coherence with the practical units ampere and volt In 1874 the mechanical units cm, g, s ('CGS') were adopted as the coherent system of units for science
  • $cm^3 g$ as a unit of adsorption - Physics Stack Exchange
    Indeed, when you just want to measure how much material has been adsorbed, it's more natural to use the same units for both materials I think that 1 cubic centimeter per gram is not a unit of "adsorption" per se - adsorption is a process, not a quantity, after all - but it's a unit of "specific pore volume" You take one gram of a material and measure the volume of the pores inside this
  • conventions - Can units be plural? - Physics Stack Exchange
    The unit symbol shall remain unaltered in the plural and is not followed by a full stop except for normal punctuation, e g at the end of a sentence it is not acceptable to use the plural of unit symbols By the way, it is also not permissible to use abbreviations such as “hr” for unit symbols (“h”) or unit names (“hour”)
  • conventions - Kg or kg: notation - Physics Stack Exchange
    Uppercase letters are used for larger prefixes like "M" (mega for one million) or "G" (giga for one billion), which are meant to represent large multiples Thus, the notation "Kg" is not appropriate because it confuses the prefix "kilo-" with the unit of temperature, Kelvin, which should be written as "K" The proper notation is always "kg"
  • Notation: units with negative exponents - Physics Stack Exchange
    Also, from a theoretical perspective, using negative powers makes it clear that any possible unit is a product of powers of some fixed based units, and it makes it slightly easier to figure out the unit for products or quotients of quantities (you just add or subtract the exponents for each base unit)
  • Simple Harmonic Motion, $\\omega ^2$ constant
    Simple Harmonic Motion is a projection of a uniform circular motion with radius equal to the amplitude You can see video for understanding it better Now, imagine this figure For uniform circular motion the radial acceleration (called centripetal acceleration) is given by $$ a = \frac {v^2} {r} \\ ~~~~~~~~~~~v = \omega^2 r ~~~~~~~~~~~~~~~~~~ ( \textrm {$\omega$ is the angular velocity}) \\ a
  • Difference between Kilogram-weight and mass
    Weight is force which affects body due to gravitational pull on it and it is measured in Newtons Mass is a measure of how good body can keep it's inertial properties,- i e "wish strength" for keeping same linear speed upon influence of constant force and it is measured in $\text {kg}$ in IS system





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