Kevin is standing outside a railway station. He can know whether a train is approaching the station or departing from the sound it makes. Which principle of sound waves is he using?

In 1815 William Smith correlated strata from many locations and plotted it on paper to show the spatial distribution of rock units on Earth's surface. This document was the first modern: A. geologic column B. geologic map C. stratigraphic column D.

Directions: Select ALL the correct answers. Friction is a force that can oppose the motion of two objects that are touching each other. Which of the following are examples of friction? A. A nail holds two wooden boards together. B.

Which seismic wave is characterized by alternating compression-expansion parallel to the direction of wave movement?

What do you think happens to the temperature when water changes to gas?

A toy gun uses a spring to project a 5.9-g soft rubber sphere horizontally. The spring constant is 8.0 N/m, the barrel of the gun is 17 cm long, and a constant frictional force of 0.035 N exists between barrel and projectile.

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.

How are electromagnetic waves different from matter waves?

A dc generator is the same as a (n) a. electric motor. b. ac generator. c. armature. d. electric current.

Which of the following best describes scientific knowledge A.) Durable B.) Absolute and never changing C.) Frequently varies