Conservation of mass Definition and 55 Threads

conservation of mass and energy? ok... i get the principle, but what about birth? Meaning what about when someone is born, where is that mass coming from? Where is the energy coming from? The only thing i can think of is the nurishment the mom takes and gives to the baby, but how can that...

:smile: Hi all I am in deperate, desperate, desperate need of some help. I have this question that I have been working on for hours and have made no progress at all. Here is the question. Write down the "conservation of mass" equation for dm(r)/dr, where m(r) is the mass inside radius...

Suppose I burned a log. If I collected all the products of the burning process (the smoke particles, the ashes, etc.) would they have the same exact mass as my original log? Or would they have less mass because they are at a lower energy state then the original log (Energy-mass equivalence)...

with relativistic concepts in mind A Kaon split into 2 pions, One pion is stationary and one is stil moving in the same direciton. For Kaon rest mass = 497.67MeV/c^2 Pion = 139.57MeV/c^2 What is the kineric energy of the kaon and what is the energy of hte pion not at rest. Since...

Hi. This was the one extra problem credit problem I couldn't figure out in our momentum unit. (Since its not homework I posted here) In a fireworks display, a 3.0 kg rocket moving at 4 km/h straight up explodes into three equal pieces of of 1.0 kg in mass. Piece A moves straight...