Find the mass m, the moments mx and my, and the center of mass (x, y) of the uniform flat plate of density rho = 1 bounded by the curves y = x2 ln x and y = -x2 ln x and the lines x = 0 and x = 1. g

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?