In any chemical reaction, the mass of the reactants equals the mass if the product. This result forms the basis of the Law of Conservation. which statement correctly explains why this is a law rather than a theory? It has more scientific evidence supporting it.

It has both independent and dependent variables.

It has been tested with the latest laboratory balances, which are very accurate.

It describes a repeatedly observed relationship, but it does not offer an explanation.

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.