consider a solid sphere and a solid disk wiht the same radius and the same mass. explain why the solid disk has a greater moment of inertia than the solid sphere g

I’ve been stuck on this for a while

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?

Why did thomson's results from experimenting with cathode rays cause a big change in specific thought about atoms ?