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.

9. If experimental trials were conducted in which Combinations 1-4 were tested, what would be the independent variable and what would be the dependent variable?

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

Find the independent and dependent variables. The numerical value controlled by the experiment is the independent variable, and the result calculated by the measurement is the dependent variable.

In this experiment, D, T, and V are all independent variables, and only F is the dependent variable