Which object is in static equilibrium?
-a rolling ball that has a net force acting on it
-a cruising car that has no net force acting on it
-a book that has no net force acting on it and is sitting on a table
-a vase that has a net force acting on it and is sitting on a shelf

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question