Variable-mass system events. The following derivation is for a body that is gaining mass (accretion). A body of time-varying mass "m" moves at a velocity v at an initial time "t". In the same instant, a particle of mass dm moves with velocity u. The initial momentum can be written as Now at a time "t" + d"t", let both the main body and the particle accrete into a body of velocity v + dv. Thus the new momentum of the system can be written as Since d"m"dv is the product of two small values, it can be ignored, meaning during d"t"
N. S. Satya Murthy Indian Academy of Sciences elected Murthy as a fellow in 1975. The Council of Scientific and Industrial Research awarded him the Shanti Swarup Bhatnagar Prize, one of the highest Indian science awards in 1979. He became an elected fellow of the Indian National Science Academy in 1981. He was also a life member of the Magnetics Society of India. The Indian Physics Association has instituted an annual award, "N. S. Satya Murthy Memorial Award" for recognizing research excellence in physical sciences among young scientists. N. S. Satya Murthy Nivrathi Suryanarayanashastry Satya Murthy (5 February 1936 – 8 October 1984) was