Need a small,  horizontal pipe with cross-sectional area a is joined to a large horizontal pipe with cross-sectional area 2a.  both pipes are at the same height,  and completely filled with water (density 1000  kg/m^3).  what is the speed of the water in the large pipe if the speed in the small pipe is 1  m/s?

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.