/sci/ - Science & Math

>>12637888
Started the book 'Elements of Propulsion' yesterday and I'm having a hard time with the questions, this one with the thrust equation in particular bothers me since I can't see what I've done wrong (though so far I'm assuming it to be something to do with unit conversions);
>Use eqn. F = (m0+ mf)Ve - m0V0 + (Pe = P0)Ae
>10200 = 8200Ve - 0 + 14.696 x (164 x 3600) to convert Ae from lbm/s to lbm/h
>10200 = 8200Ve + 8676518 (-)
>-8666318 = 8200Ve
>Ve = -8666318/10200 = -849...
>Answer is 1973ft/s.
I'm confused as heck... can you convert both m to ft and s to hr in the same question? Will that make it right? I've always been put off of doing stuff like that.