When a light wave enters into a medium of different optical density,

a. its speed and frequency change.

b. its speed, frequency, and wavelength change.

c. its speed and wavelength change.

d. its frequency and wavelength change?

Russ makes the diagram below to organize his notes about how Newton's first law describes objects at equilibrium.

In late spring, a student began conducting an investigation about the flower preferences of bees. She counted the number of wildflowers in a small plot and created the following table.

While trying out for the position of pitcher on your high school baseball team, you throw a fastball at 87.6 mi/h toward home plate, which is 18.4 m away.

When rust forms on a piece of iron, what evidence do you have that a chemical reaction has taken place?

How is a net electric charge produced?

Tom stops using a new skin cream for five days to determine if the cream is the cause of a recent rash. What stage of the scientific method is Tom using?

Use your observations to determine qualitatively how the strength of the electric interaction between charged objects depends on the distance between them. Explain your reasoning (this is trickier than it might seem at first).

Far from any other masses, two masses, m1 and m2, are interacting gravitationally. The value for the mass of m1 suddenly doubles. What happens to the value of the gravitational force that mass m2 exerts on mass m1?

Which of the outer planets are most like Earth? How?

The pressure inside a champagne bottle can be quite high and can launch a cork explosively. Suppose you open a bottle at sea level. The absolute pressure inside a champagne bottle is 6 times atmospheric pressure; the cork has a mass of 7.