A uniform meter stick pivoted at its center has a 155-g mass suspended at the 18.5-cm position and a 25.0-g mass suspended at the 38.4-cm position. At what position should a 275-g mass be suspended
to put the system into equilibrium?

An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. part a how much work is required to bring an additional electron from infinity to the origin? express your answer with the appropriate units. part b if, instead of the second electron coming in from infinity, it is initially at x = + 20.00 m on the axis and is given an initial velocity of 100.0 m/s toward the origin, does it reach the origin? part c how close to the origin does it come?