Khi khoảng cách giữa hai điện tích trong chân không giảm xún 2 lần thì độ lowswn lực cu lông

Need in all of themmm only answer if you know plsssss

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.