HI Hi ^^ need help again 1. The viscous drag [i:2f39b02284]F[/i:2f39b02284] on a sphere moving in a liquid depends on [i:2f39b02284]a[/i:2f39b02284], radius of sphere, [i:2f39b02284]v[/i:2f39b02284] its velocity and [i:2f39b02284]n[/i:2f39b02284] the viscousity of the liquid. Use the method of dimension to derive an equation for [i:2f39b02284]F[/i:2f39b02284] in terms of [i:2f39b02284]a, v and n.[/i:2f39b02284] 2. The velocity of sound in medium depends on the wavelength [i:2f39b02284]L[/i:2f39b02284], Young modulus [i:2f39b02284]E[/i:2f39b02284] and density [i:2f39b02284]p[/i:2f39b02284] of the medium. Use the method of dimension to derive an equation for [i:2f39b02284]v[/i:2f39b02284] in terms of [i:2f39b02284]L, E and p.[/i:2f39b02284] someone please help me I will be very glad and thank you so much for your help ^^ :D