Consider a blood cell in motion in the middle of the sample with a higher density than the fluid around it. What force (or forces) is responsible for providing the centripetal acceleration on a blood cell?
a. The force of gravity
b. The drag force
C. The buoyant force
d. The normal force from the walls of the centrifuge test-tube
e. (a) and (c)
f. (b) and (c)
g. (c) and (d)