When non-metric units were used in the united kingdom, a unit of mass called the pound-mass (lbm) was employed, where 1lbm=0.4539kg. (a) if there is an uncertainty of 0.0001kg in the pound-mass unit, what is its percent uncertainty? (b) based on that percent uncertainty, what mass in pound-mass has an uncertainty of 1 kg when converted to kilograms?

Consider a u-tube whose arms are open to the atmosphere. now equal volumes of water and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and therefore, the liquid levels in the two arms are the same. if the fluid height in each arm is 30 in, determine the gage pressure exerted by the person on the oil by blowing.