Acontainer has a large cylindrical lower part with a long thin cylindrical neck open at the top. the lower part of the container holds 20.0 m3 of water and the surface area of the bottom of the container is 8.00 m2. the height of the lower part of the container is 2.50 m, and the neck contains a column of water 8.50 m high. the total volume of the column of water in the neck is 0.200 m3. what is the magnitude of the force exerted by the water on the bottom of the container?

One kind of e-book display consists of millions of very small spheres that float in a thin fluid layer between two conducting transparent plates. each sphere is black on one side and white on the other, and possesses an electric dipole moment directed from the white side to the black. when an electric field is applied between the plates, the spheres rotate so that their dipole moment lines up with the field. depending on the fields direction, either the black or the white sides of th espheres can be made visible.the dipole moment of the spheres can be modeled as two opposite charges of magnitude 3.5 x 10^-15 c, separated by a distancce of 100 micrometers (um). what is the maximum possible torque on a sphere if the electric field between the transparent plates is 4.0 x 10^5 n/c