0 A Perspex container has a 6 cm square base and contains water to a height of 7 cm (Figure 1.13).

a What is the volume of the water?

b A stone is lowered into the water so as to be

completely covered and the water rises to a height of

9 cm. What is the volume of the stone?

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.