Review of Mass in Special Relativity
In special relativity, the invariant mass (hereafter simply "mass") of an isolated system, can be defined in terms of the energy and momentum of the system by the relativistic energy-momentum equation:
Where E is the total energy of the system, p is the total momentum of the system and c is the speed of light. Concisely, in fundamental units where, the mass of a system in special relativity is the norm of its energy-momentum four vector; otherwise, it is .
Read more about this topic: Mass In General Relativity
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—Ruth E. Zambrana, U.S. researcher, M. Hurst, and R.L. Hite. “The Working Mother in Contemporary Perspectives: A Review of Literature,” Pediatrics (December 1979)
“Americans have internalized the value that mothers of young children should be mothers first and foremost, and not paid workers. The result is that a substantial amount of confusion, ambivalence, guilt, and anxiety is experienced by working mothers. Our cultural expectations of mother and realities of female participation in the labor force are directly contradictory.”
—Ruth E. Zambrana, U.S. researcher, M. Hurst, and R.L. Hite. “The Working Mother in Contemporary Perspectives: A Review of Literature,” Pediatrics (December 1979)
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