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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 $\endgroup$ –
Converting air flow rate between kg s and m^3 s You need to consider the density of the air, which varies with temperature and air pressure At 15 degrees Celsius, at sea level, the density of air is 1 225 ${kg} {m^3}$
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
How does width and thickness affect the stiffness of steel plate? $\begingroup$ This is an excellent answer It's written in a way that concisely answers the question asked, it has links for further reading but avoids creating an "answer in another castle" situation, it clearly explains the concepts involved and shows their application through example, and it is well written and formatted in an easy to digest manner