I have a problem with a small physics problem. It requires some knowledge of calculus which I dont yet posses Im looking here for ideas. The problem states that there is a centrifuge tube with a lenght 12cm that is caused to spin by a rotating arm with lengt 8 cm. The tube is filled with 10 cm of a homogenous liquid with density p. It is rotating at a full angular velocity w and its travelling fast enough to be almost horizontal. The question requires me to show that the resultant pressure of the liquied at a distance r from the axis of rotation is delta p/ delta r= prw^2 any suggetions on how to get this result?