The density of blood is 1.05 kg/m3, find the mass of a bag of blood for a transfusion, if the volume is 1.5 m3.

(1.5 m^3) • (1.05 kg/m^3) = 1.575 kg.  That's quite a bag you've got there !  1 m^3 is like 264 gallons of blood.  Hope the poor patient survives the transfusion. Also, the actual density of blood is around 1.05 g/cm^3, or 1050 kg/m^3. The blood they're giving the guy in this question is about 18% less dense than the AIR in his hospital room, and they're pumping 264 gallons of it into him. Maybe THAT'S his whole problem.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete