Goodmorning everyone!
I have this problem:
The mass of a given airplane at sea level (g=32.10 fps2) is 10 tons. Find its mass in lbm, slugs, and kg and its (gravitational) weight in lbf when it is travelling at a 50,000-ft elevation. The acceleration of gravity g decreases by 3.33 x 10-6 fps2 for each foot of elevation.
I already know the lbm and slugs
But my concern is that I can't found the answer lbf which should be 19, 850lbf
My solution:
F =ma
= 20000lbm (32.0075ft/s^2)
=640150lbm-ft/s^2
640150lbm-ft/s^2 x (1lbf/32.174lbm-ft/s^2)
= 19896.5lbf
But my textbook answered 19850lbf can anyone show me how the book get 19850lbf
Oh I get it I use 32.174 instead of 32.1 damn