Calculate New Load - rig application

[Zak Brigadier]

Homework Statement

A rig accelerates a load of 200,000 lbf from zero to 60 ft/min in 5 seconds.

Homework Equations

Compute new load shown on the hook load indicator ?

The Attempt at a Solution

Calculated the distance of load l = 4.99 ft.

 

[berkeman]

Homework Statement

A rig accelerates a load of 200,000 lbf from zero to 60 ft/min in 5 seconds.

Homework Equations

Compute new load shown on the hook load indicator ?

The Attempt at a Solution

Calculated the distance of load l = 4.99 ft.

Can you please show more of your work? Can you attach a diagram of the problem? Is all of this acceleration vertical?

 

[Zak Brigadier]

Hello Berkeman:

Thank you for your reply. I don't have a diagram attached. Yes the acceleration is vertical. The hook lowers/hoist loads vertically in a drilling rig.

 

[berkeman]

So the two things creating the tension in the cable is the weight of the load, and the extra force needed to generate that acceleration. Can you start to write down the equation for the total force on the accelerating object now?

 

[Zak Brigadier]

Yes.

P-T = ma