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TULASI-PRAJNA, Sept., 1990
12. The Universe and Dr. Einstein, p. 76. 13. Cf. The Mysterious Universe, p. 86 14. Physics and Philosophy, p.102-103. 15. As stated before, light travels at the speed of 186000 miles per
hour. The distance travelled by a ray of light within a year, is called light-year.
1 light-year=5.88 x 1012 miles. 16. Though, popularly, mass and weigbt are regarded to cannote the
same meaning, in scientific definition, they devote different properties of matter. Mass is considered to be more fundamental than weight. It is a matter of observation that a force applied to a body produces an acceleration proportional to the force. The constant of proportionality is the mass of the body. Thus, the mass of a body is a measure of its 'inertia' or reluctance to change its motion. The greater the mass of a body is, the more is the force required to move it. It may be remarked here that usually, even in the scientific works, mass is regarded as the amount of
matter and sometimes used as synonymous to matter. 17. The relation of the mass with velocity is given by the following
mathematical formula : If
mo = mass of the body at rest, m = mass of the body in motion, v = the velocity of the body,
c = the velocity of the light, - Then
mo
m
=
18. Mathematically, the equation connecting the two quantities in any such transformation is :
E = mc2 or m = 32
where
c = velocity of light. E = energy released.
and
m = mass completely converted into energy.
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