An oil storage tank has the form of a circular cylinder with its axis horizontal, as shown in Figure 2.9. The volume of oil in the tank when the depth is h is given in the table below.

Draw a careful graph of V against h, and use it to design the graduation marks on a dipstick to be used to assess the volume of oil in the tank.

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h/m 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 V/10001 7.3 19.7 34.4 50.3 66.1 80.9 93.9 100.5 hm Figure 2.9