The electric field is zero everywhere except in the region 0≤x≤8.00 cm, where there is a uniform electric field of 100 n/c in the +y direction. a proton is moving in the +x direction with a speed of v = 1.00×106 m/s. when the proton passes through the region 0≤x≤8.00 cm, the electric field exerts a force on it. 1) when the x coordinate of the proton’s position is 8.00 cm, what is the x component of its velocity? (express your answer to three significant figures.)

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.