Question

1. a football players running speed is decreasing as they approach the 70 yard line. the football player is _______. a. in static equilibrium b. in dynamic equilibrium c. in both dynamic and static equilibrium d. not in equilibrium

question 12 * 1 point

1. which of the following objects has the least inertia? a. 10.0 kg box b. 1.0 kg brass mass c. 23.0 kg rock d. 12.0 kg book

Explanation:

Step1: Recall equilibrium conditions

An object is in static equilibrium when it is at rest and the net - force acting on it is zero. An object is in dynamic equilibrium when it is moving with a constant velocity and the net - force acting on it is zero.

Step2: Analyze football player's motion

The football player's speed is decreasing. Since the velocity is changing (acceleration is non - zero), the net - force acting on the player is non - zero. So the player is not in equilibrium.

Step3: Recall inertia concept

Inertia is directly proportional to mass. The object with the least mass has the least inertia.

Step4: Compare masses of objects

We have a 10.0 kg box, a 1.0 kg brass mass, a 23.0 kg rock, and a 12.0 kg book. The 1.0 kg brass mass has the smallest mass among them.

Answer:

1. D. not in equilibrium
2. B. 1.0 kg brass mass