I wish to determine the Terminal velocity of a large Cube having all of the following physical proberties.

Total mass = 7.3 x 10^7 Kg

Lenght = 63.4 m
width = 63.4 m
height = 63.4 m

material steel & Concrete

Drop from height = 25 miles, 5 miles, 1 mile

This object is the top 16 floors of World Trade Center Twin Tower, north on 911.

All of the other critical calculations have been determined, except the Terminal Velocity with drop from 25 miles and the others mentioned above.

velocity at impact in a vacuum has already been determined.
Energy at impact in a vacuum has already been determined.

I once had the Terminal velocity factor for a Cube, but can no longer locate in my files or on the internet.

Someone familiar with calculating Terminal Velocities for shapes like spheres, prisms, or cones, should be able to do this calculation and show us the results, in great detail, mathematically.

I know what the equation is, but do not know the factor for the shape of a Cube. that is what I need....

I welcome some hero to come to my rescue on this issue.

Chuck Boldwyn
Retired Physics & Chemistry Teacher