What is the meaning of painting

The electric field inside a cell membrane is 8.0mn/c. what's the force on a singly charged ion in this field?

Which of the following is tru about semi-conductors

2) a cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. which one of the following graphs best describes the buoyant force b on this block as a function of time t if the block just enters the water at time t = 0 s?