what is the law of conservation of mass?
369216
matter is neither created nor destroyed
108837
80g of oxygen was produced because that is the difference between the beginning mass and the ending mass. mass is conserved during the reaction, it needs to balance.
733015
a. Applying conservation of momentum\nm1 x V_i + m2 x 0 = (m1+m2) x V_f\nV_f = (m1 x V_i)/(m1+m2)\n\nb. If m1 >> m2 then m1 + m2 -> m1\nTherefore V_f = V_i\n\nc. If m1 << m2 then m1+m2 --> m2\nTherfore V_f = (m1/m2) x V_i\n\nd.m1 x V_i - m2 x V_i = (m1+m2) x V_f\n=> V_f = ((m1-m2)x(V_i))/(m1+m2)\n\ne. m2 = m1, m2 =(1/3)(m1)
493924
the inherent property of a body by virtue of which a body at rest remains at rest and a body in motion continues to move in the same direction even after some external force is applied to it is called inertia. newton's first law of motion is the law of inertia. for example an athlete keeps running even after he reaches the finish line because of inertia of motion which will not allow him to stop immediately. \n           momentum,p,can be calculated by the formula \n                  p = mv \n         where m is the mass of the object and  v is the velocity.\n              i think you are a ninth std student and i learnt all that last year!
594714
No, the amount is constant. It can change between different states though. Particles with some mass can change into energy in interactions and vice versa and there are many many different ways of energy changing from one to another.\n\nOn a school level you can think of "chemical energy" changing to kinetic energy in a car for example. At a higher level you need to consider more in-depth things like an electron loosing potential energy by moving down a level in orbit around an atom and emitting a photon with that energy so it is conserved.
876548
Newton's Laws of Motion:\n\nI. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.  \n\nII. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.  \n\nIII. For every action there is an equal and opposite reaction.
812340
it's the same. Mass of an object has nothing to do with its temperature. The definition of mass is the amount of matter in an object. What you are measuring with a balance is the weight of an object, which is also independent of temperature, and is the force of the gravity acting on the object. \nLook up the definitions of mass and weight on wikipedia.
746965
You don't need to find the mass if use conservation of energy to solve the problem.\n\nThe kinetic energy of the can initially is:\n1/2*m*v^2\n=.5*m*2^2\n=2*m\nand when it comes to rest it is zero\nThe energy was lost to the work done by friction.\n\nthe force of friction times displacement is the work:\n\nu*g*m*d\n=.2*9.8*m*d\n=19.6*m*d\nnow set the energy of the system equal to zero:\n2*m-19.6*m*d=0\ndivide out the mass and solve for d:\nd=19.6/2\n=9.8m\n\nj
800018
the way to find the mass of an object is to divide the volume by the density it would look like this M = D / V
271962
I'd say that in general the mass of the world is decreasing ever so slightly since we are consuming product to create energy (heat).  This doesn't answer your question about manufacturing , where for the most part mass would be conserved (raw materials = product + biproduct/waste = constant) but the electricity that went into manufactureing a product was probably made by creating heat from coal, or oil, or gas, or some other substance that is burned - thus reducing its mass through conversion to heat.\n\nMy dear physics "professors" below: what do you think Einstein's E=Mc^2 told us?  Primer: That matter can be converted to energy which has no mass!
233618
1 mass\n2 magnitude of separation
658476
Law of Conservation of Mass.  The process of melting does not add or remove mass, and you're not creating or destroying any, so it should weigh the same before and after.
735972
Conservation of energy and momentum basically means that energy is never created or destroyed, and same with momentum. It has to come with somewhere. If energy or momentum leaves one system, it must enter another system. If energy appears in a system, it had to have come from one. Momentum is never really gained or lost, and same with energy -- it is simply transfered from one body to another. An elastic collision is one in which no kinetic energy is lost, all of it is transfered directly from one system to another.. In an inelastic collision, some of the energy is transfered to a third system (via sound waves, heat energy, or other such energy loss). In this case of an inelastic collision, the total kinetic energy of the two bodies before, is not the same as it is afterwards. The difference in these values would be the energy "lost" from these systems that was tranfered elsewhere.
765636
Newton's first law states: A object at rest will remain at rest and an object in motion will remain in motion (at a constant speed and direction) unless acted upon by an external force.\n\nThis is also known as the law of inertia.
509753
Mass is the measurement of matter, usually in grams,\nkilograms, etc.\n\nMatter is any material found in the universe that is in one of three states- those being gas, liquid, or solid.\n\nThe law of conservation of matter and energy includes the\nassertion that there is a finite (limited) amount of matter and energy in the universe.\n\nMatter can be converted into energy (example: the sun\nconverts its matter into energy continuously in the process\nwe call nuclear fusion).
874216
its newtons first law, (objects in rest stay at rest unless a force is acted upon it which causes acceleration) and objects in motion stays in motion\n\naka intertia keeps the smaller peices moving in the same direction
127709
Coulombs law.\nWhen the distance is made 3 times longer (for instance),\nthe force between the charges becomes 3^2=9 times smaller.