In this problem, you calculated that when the wavelength of incoming photons goes down by a factor of two, from 800 nmnm to 400 nmnm , the stopping potential required increases by more than a factor of three, from 0.6 VV to 2.15 VV . In general, for a real material with a positive work function, how will the stopping potential change when the wavelength goes down by a factor of NNN

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.