Selma made an error while creating a chart to describe the technological design process for a new vacuum. which best describes how selma can correct the error in her chart? change “identify a need” to “identify a problem.” switch the descriptions for “identify a need” and “evaluate the solution.” change “implement the solution” to “test the prototype.” switch the stages “evaluate the solution” and “design a solution.”

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.