- #1
Zang
Homework Statement
The 4-kg ball and the attached light rod rotate in the vertical plane about the fixed axis at O. If the assembly is released from rest at and moves under the action of the 60-N force, which is maintained normal to the rod, determine the velocity v of the ball as approaches . Treat the ball as a particle.
Homework Equations
T2 = U1-2 + T1
s = rθ
T = 0.5mv2
3. The Attempt at a Solution
200mm = 0.2m; 300mm = 0.3m
s = 0.2(π/2) = 0.1π
T1 = 0
T2 = U1-2 = 60(0.1π) + mg(0.3) = 30.622J
v = ((2*30.622)/4)0.5 = 3.91 m/s but my answer is wrong