1. The problem statement, all variables and given/known data Figure P8.36 shows a block of mass m resting on a 20° slope. The block has coefficients of friction µs = 0.83 and µk = 0.47 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging block of mass m2 = 2.0 kg. http://img6.imageshack.us/img6/9688/p836.gif [Broken] (a) What is the minimum mass m that will stick and not slip? m_1=1.783kg (b) If this mimimum mass is nudged ever so slightly, it will start being pulled up the incline. What acceleration will it have? a_x= ??? 2. Relevant equations F=ma T=ma f_k=μ_k*n n=m*g*cos(θ) m_1 = 1.783kg m_2 = 2.0kg θ = 20 degrees T = 19.6N μ_k = 0.47 μ_s = 0.83 3. The attempt at a solution I found the mass m_1 using.. (part A) m_1=(T/(μ_s*g*cos(θ)+gsin(θ)) ..and I tried to find the a_x using forces.. (Part B begins here) T - f_k - m*g*sin(θ) = m*a_x ..which gave me the equation... a_x=(T/m_1)-(μ*g*cos(θ))-(g*sin(θ)) ..and I am not sure if I am doing the math wrong but my answers are rejected. Could anyone perhaps check my force diagram and algebra?