The density of blood is 1.05 kg/m3, find the mass of a bag of blood for a transfusion, if the volume is 2.0 m3.

 M = 2.10kg

Explanation: We know that the density of blood is d = 1.05 kg/m^3

This means that each m^3 of blood weighs 1.05kg

So in 2m^3 of blood, the mass will be two times the one that we had before.

M = 2*1.05kg = 2.10kg

This also can be calculated as:

M = 2m^3*1.05kg/m^3 = 2.10kg*(m^3/m^3) = 2.10kg

d.7.5cm is your answer

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27