The periodic table displays A.
only the important compounds that exist in the world.
B.
only the important elements that exist in the world.
C.
all of the known elements that exist in the world today.
D.
all of the known compounds that exist in the world today.

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.