A girl on the swing may increase the amplitude of the swings oscillations if she moves her legs at the natural frequency of the swing this is an example of

True or false graphs must include scales that increase by the same amount

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

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.