- #1

teage

- 7

- 0

## Homework Statement

I have a problem involving a goods lift with a cage m1 = 1500kg which is raised at V = 4m/s via a winding drum with a radius of 0.6m with the help of a counter weight of m = 900kg. i am asked to find the braking torque required to bring it to rest in 1 1/3 seconds. Also i am to consider gravity playing its part.

## The Attempt at a Solution

I have calculated a few things that i thought i would need

inertia of the drum = 95 kg.m^2.

angular acceleration = -5 rad/sec^2

angular velocity= 6 2/3 rad/sec

linear distance to stop = 8m

My idea was to add the kinetic energy of m1, The drum and the potential energy of m2 together to get a total energy so i could use T= E/theta. But then i realized that m1 would contribute to the braking force.

i have attached an image of what i am working with. Any assistance or guidance is much appreciated.

Thanks

Kane