A square plate with edge length 9 cm and mass 488g is hinged along one side. if air is blown over one surface only, what speed must the air have so as to hold the plate horizontal? The air has a density of 1.212kgm-3

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.