Passage II
When a sphere falls through air, the sphere is subjected to a drag force, F, that resists its motion. F depends on the spheres diameter, D; the air temperature, T; the sphere's speed, V; and atmospheric pressure.
The table below gives F, in newtons(N), on a sphere falling through air near Earth's surface, for various combinations of D, in meters (m); T, in degrees Celsius (°C); and V, in meters per second (m/sec). For each combination, air pressure is 1 atmosphere.
7. Based on Combinations 9-12, the relationship between F and V is best represented by which of the following graphs?
Your Answer is
Correct Answer is C
Explanation
Looking at combinations 9-12 in the table, as V increases, F also increases, so exclude A & B;
From the increase of F, it can be seen that V and F are not proportional, So exclude D