- #1
crazyman27
- 2
- 0
Homework Statement
Both motors are drawing in the cord at a constant rate of 8 m/s. Determine the speed of the elevator.
Homework Equations
-
The Attempt at a Solution
Using an equation of constraint I got 4Xe - Xb - Xc = constant (Xe being the distance from the roof of the shaft to the elevator, Xb being the distance from the roof of the shaft to an arbitrary point on the left-most cord, and Xc being the distance from the roof of the shaft to an arbitrary point on the right-most cord).
Differentiating this with respect to time gives 4Ve - Vb - Vc = 0 and subbing in 8m/s for Vb and Vc gives the speed of the elevator to be 4m/s. This isn't the solution however, not sure where I went wrong.
Any help appreciated.