Select the correct answer.

In which research method does a researcher change the value of one variable to determine how the change affects another variable?

A.

experiment

observational research

C. survey

D. case study

What is pitch related to in terms of sound? Does it affect the speed? If so, how?

A loaded gun is dropped on a frozen lake. The gun fires, with the bullet going horizontally in one direction and the gun sliding on the ice in the other direction. The bullet's mass is 0.04 kg, and its speed is 285 m/s. If the gun's mass is 2.

What is the unit for mass?

4. What are three tips parents can use to improve communication with their children? Discuss one that you think is most important

Will an electric charge spread over an entire balloon? explain

The train traveled 500 kilometers north to Odessa in 2 hours. What's the train's speed? What is the velocity?

Are microwaves and radio waves faster or slower than other types of electromagnetic energy?

If you dive under-water, you notice an uncomfortable pressure on your eardrums due to the increased pressure. The human eardrum has an area of about 70 mm2 (7*10-5m2), and it can sustain a force of about 7 N without rupturing.

Why cant kinetic energy ever be greater than potential energy

For a stationary observer, when the source of a sound is moving, its pitch appears to change.