A small centrifuge head has 12 spots (holes) labeled in a manner similar to a clock face. There are three tubes of equal volume that need to be centrifuged. In which of the following choices for tube placement would the centrifuge be balanced?
A) 1, 2, 3
B) 1, 4, 7
C) 1, 5, 9
D) 1, 3, 8

Question

Quizplus · Accepted Answer

Placing the tubes in spots 1, 5, and 9 would balance the centrifuge because they are all equidistant from each other and therefore exert equal force on the centrifuge head. The other choices would not be balanced because they do not have the same distance between each tube.

A Small Centrifuge Head Has 12 Spots (Holes) Labeled in a Manner