1. The problem statement, all variables and given/known data omega_c = (nabla) cross (u) where omega_c is the rotational velocity of a particle nabla refers to the gradient operator u is the linear velocity of the particle 2. Relevant equations what are the expressions of omega_c_x = omega_c_y = i.e, in x- and y-cordinates only. 3. The attempt at a solution is it ?? omega_c_x = du_dy - du_dx; omega_c_y = dv_dy - dv_dy; sorry i have tried alot..beats me..pls help.