2015年8月25日 · 1 pound mass is that mass that weighs one pound in 1 g gravity. For most practical cases, a pound mass and a pound weight define the same amount of stuff on the surface of the earth. To define a pound mass we rearrange Newton's law of F = mA to. m = F/A. then plug in the particulars to get pound mass: 1 pound mass = (1 pound force)/(32.174 ft/s²)

2021年2月16日 · By example, an object with a mass of 5 lb $_m$ has a mass of 2.2680 kg regardless of where it sits (e.g. what planet). But this mass. exerts 5 lb $_f$ as its weight on earth; exerts 0.827 lb $_f$ as its weight on the moon with gravitation 5.32 ft/s $^2$ By inversion, an object that exerts 5 lb $_f$ as its weight on the moon has a mass of 30.2 ...

2022年4月19日 · In the Imperial system the mass unit is the slug [sl], and is derived from the pound-force by defining it as the mass that will accelerate at $1 ft/s^2$ when a $1 lb_f$ acts upon it. The density of water is $1.940 sl/ft^3$ at 39 °F (4 …

2016年8月22日 · I think this is very fundamental question. I am wondering why 0.00259 is used as weight-mass conversion ratio, when inch/pound unit is used in Nastran.

2023年6月13日 · Pound-force (lbf) vs Pound-mass (lbm) 3. Design a beam that is straightened with force on one end. 4 ...

2015年5月14日 · 5 cm = 0.05 m. The gravitational force on your 450 g mass is 4.4 N as you say, so the torque just to keep up with gravity is (4.4 N)(0.05 m) = 0.22 Nm. However, that is the absolute minimum torque just to keep the system in steady state. It leaves nothing for actually accellerating the mass and for overcoming the inevitable friction.

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 \ …

2020年2月19日 · Two people each exerting 50 pounds can lift a 100 pound object; two levers double the force applied; two locomotives double the pulling power, etc. Share Improve this answer

2022年3月29日 · $\begingroup$ using horsepower, the units will be HP/pound or hp/ton most likely. Hp has a conversion factor in it, 33000 ft-lb/min/HP. $\endgroup$ – Tiger Guy

2015年2月7日 · M2 = start mass M1 = end mass g = gravitational constant (~~= 10 m/s/s) Call M2/M1 = mass ratio = MR. Using a modest by modern standards Isp of 300, to produce a delta-V of say 4000 m/S requires a MR of about 3.7 or end mass ~= 1/3.7 = 27% of total. So ABOUT 25% of the above 13,500 pounds could be delivered to lunar orbit =~ 3375 pounds = 1.5 tons