1. The problem statement, all variables and given/known data http://imageshack.us/f/41/physicsc.png/ My professor gave the following hints: Write down what you know about how r (position of mass from hole) varies with time. Then write Newton's 2nd law in polar coordinates. For part (a), the differential equation that you are looking for comes from the F_theta = ma_theta equation. Part (b) involves integrating the result from part (a), and Part (c) uses the F_r = ma_r equation. 2. Relevant equations F(θ)=m[rθ"+r'θ'] 3. The attempt at a solution For part a, I labeled the force of tension pointing towards the hole. And that's the only force I had. For part B, I tried doing this: r=vt (same v of the rope) r'=v r'=0 θ=wt θ'=w θ"=0 Then, I plugged the above results into the equation: F(theta)=[rθ"+2r'θ'] F=0+2(-v)w I then got: θ''=θ' m(-v)w=-bw(given) bw(given)/m=w Would this be right? I do not thinkso... Thanks all!