page 07 7. The terminal velocity vt of a skydiver is given by the relationship 2 t d mg v ρAC = where m is the mass of the skydiver in kg g is the gravitational field strength in N kg-1 Cd is the drag coefficient ρ is the density of air in kg m-3 A is the area of the skydiver in m2. When in freefall, a skydiver of mass 95 kg has a drag coefficient of 1∙0 and a terminal velocity of 44 m s-1. The gravitational field strength is 9∙8 N kg-1 and the density of air is 1∙21 kg m-3. The area of the skydiver is A 0∙59 m2 B 0∙79 m2 C 0∙89 m2 D 4∙2 m2 E 35 m2. 8. A spacecraft is travelling at a constant speed relative to a nearby planet. A technician on the spacecraft measures the length of the spacecraft as 275 m. An observer on the planet measures the length of the spacecraft as 125 m. The speed of the spacecraft relative to the observer on the nearby planet is A 1·54 × 104 m s-1 B 2·22 × 108 m s-1 C 2·67 × 108 m s-1 D 3·00 × 108 m s-1 E 7·14 × 1016 m s-1. [Turn over