The force f, of the wind blowing against a building is given by f=cdrhov2 a/2, where v is the wind speed, rho the density of the air, a the cross-sectional area of the building, and cd is a constant termed the drag coefficient. (a) determine the dimensions of the drag coefficient. (b) is this a homogeneous or a non-homogeneous equation? how can you tell? (c) in what unit system is the coefficient defined?

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?