Mass in special relativity the mass of a moving particle." When the relative velocity is zero, formula_33 is simply equal to 1, and the relativistic mass is reduced to the rest mass as one can see in the next two equations below. As the velocity increases toward the speed of light "c", the denominator of the right side approaches zero, and consequently formula_33 approaches infinity. In the formula for momentum the mass that occurs is the relativistic mass. In other words, the relativistic mass is the proportionality constant between the velocity and the momentum. While Newton's second law remains valid in the form the
Binary mass function the true orbital velocity is low (implying low mass objects) and the inclination high (the orbit is seen edge-on), or that the true velocity is high (implying high mass objects) but the inclination low (the orbit is seen face-on). The peak radial velocity formula_1 is the semi-amplitude of the radial velocity curve, as shown in the figure. The orbital period formula_2 is found from the periodicity in the radial velocity curve. These are the two observable quantities needed to calculate the binary mass function. The observed object of which the radial velocity can be measured is taken to be object