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mechanical engineering - Pound-force (lbf) vs Pound-mass (lbm . . . The following relationship is key to understand the link between lbm and lbf: 1 lbf=32 174 lbm ft s^2 Arm yourself with this knowledge so that you can fight the good fight: the next time you hear someone say that pound-mass and pound-force are the same thing, you can confidently say they are not!
fluid mechanics - Find Acceleration Of A Buoyancy Force Of A Balloon In . . . If you are good with units please help me by showing how any of the calculations seen in the problem might correctly be done with appropriate unit conversion factors For example how do we go from lbm to slugs and back to lbf in any of the calculations above
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
Rapidly cool a flue gas without water circulation The higher heating value, HHV, of diesel is taken at 19,300 Btu lbm Sanity check on the fuel consumption - 3l h For small diesels, brake specific fuel consumption of about 1 3 lb hp-hr is the norm So about 3 * 3 * 1 8lb l is 16 2hp or 12kw So we're in the ballpark For non-turbo diesels, the heat budget is roughly 30% work out, 35% lost to liquid coolant loop, and 35% lost through exhaust
How many people would it take to pull a 1,600 ton block? Maybe also,mention how much force an average person can exert Also i think there would be other factors like how much deep the stone goes into sand or dirt unless we consider it rigid The velocity at which you have to move it I think a simple frictional force equation could solve this if your aim was just to move the stone
Converting air flow rate between kg s and m^3 s Is 1 kg s of air flow rate equivalent to 1 m 3 s? I am calculating supply air flow rate into a zone for an air conditioning system The simulation software gives the result in m 3 s but the mathematical formula that I used takes in kg s Do I need to convert the flow rate, and if so, how do I convert between kg s and m 3 s?
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
Mass and weight of air in a room - Engineering Stack Exchange A pound force is defined as the force required to accelerate a slug at 1 ft s^2 The density of air is $\rho = 0 0724 \ lb_m ft^3 = 0 0724 32 2 \ slugs ft^3$ The weight of the air is $\rho V g = 0 0724 32 2 \ slugs ft^3 \cdot32 2 ft s^2\cdot 6000 ft^3 = 0 0724\cdot 6000 \ slugs\ ft s^2 = 434 4 lb_f$