Explain why scientist use models to study atoms.

In a charge-free region of space, a closed container is placed in an electric field. Which of the following is a requirement for the total electric flux through the surface of the container to be zero? (hw 2a. 6) A.

A migrating bird flew across a lake at an average speed of 18 meters per second. Was the distance that the bird flew across the lake less than 21 kilometers?

Penny puts Fluffy in one wagon and pushes the wagon, once, as hard as she can. Penny puts Butch in the other wagon and pushes it once, also as hard as she can. Both of the wagons travel across a level surface.

We can model a small merry-go-round as a uniform circular disk with mass 88 kg and diameter 1.8 m. How many 22 kg children need to ride the merry-go-round, standing right at the outer edge, to double the moment of inertia of the system?

In an electromagnet, as the electric current is changing, what happens to the magnetic field

Two tuning forks, 254 Hz. and 260. Hz, are stuck simultaneously. how many beats will be heard?

What is a positive impact of artificial fertilizers

The coloring of the blue morpho butterfly is protective. As the butterfly flaps its wings, the angle at which light strikes the wings changes. This causes the butterfly's color to change and makes it difficult for a predator to follow.

What lunar phase would be observed from the earth, if the moon were at a 90° angle with the earth and sun?

Unbalanced contact forces between several objects would result in A. one of the objects moving B. all of the objects moving C. at least one of the objects moving and possibly all of them moving D. none of the objects moving