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mechanical engineering - Pound-force (lbf) vs Pound-mass (lbm . . . 1 lbm * 32 2 ft s2 = 32 2 lbf that would have been perfect, a lbf = lbm ft s2, but some idiotic reason he decided that 1 lbm * 32 2 ft s2 should = 1 lbf at sea level on earth, so to make the units work you have to either divide the left side or multiply the right side by gc i e 32 2 lbm-ft lbf-s2
thermodynamics - How to calculate saturated steam flow rates . . . At 200psig h=1200 1 at 30psig h=1164 0 There is not a significant difference When you get up to 650psig it even goes back down h=1131 8 I remember "enthalpy is conserved across a throttling valve" too But there is obviously more energy in saturated 200psig steam than 18psig steam per lbm $\endgroup$ –
Barometer Column with Mercury - Engineering Stack Exchange Olin's method yields the correct answer, but a dimensional analysis of the pressure number shows it using lbf I barely understand how to go between lbf and lbm mass anyway, the only consistent way I get the right answer is by converting everything to metric and then back Thus I conclude that Imperial units are stupid $\endgroup$ –
Whats a simple machine to lift and drop a 100 lbs weight repeatedly . . . 100 lbm =~ 45 kgm Wattage =~ kg x metres_vertical x 10 time_seconds So per metre of head, power = 450 Watts seconds_to_lift A battery electric drill (or even a mains drill) with a "drum" driven by the chuck can be as low geared as you wish You can also buy geared motors
Unit Conversion for Mass Density - Engineering Stack Exchange Stack Exchange Network Stack Exchange network consists of 183 Q A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers