11. By definition, the difference between a planet and dwarf planet is
a. Dwarf planets are much smaller than regular planets
b. Dwarf planets are not spherical
C. Dwarf planets do have enough mass to clear the neighborhood of their orbit
d. Dwarf planets are found only in the Kuiper Belt and Oort Cloud

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?