Billy tapped the ruler and it made a funny noise. Billy heard the sound because the ruler vibrated

forth.

molecules back and

the air

his ear

the table

his finger

Suppose you observe a binary system containing a main-sequence star and a brown dwarf. The orbital period of the system is 1 year, and the average separation of the system is 1 AU.

A red ladybug appears in white light, in red light, and in blue light.

What are 3 ways a machine serves its purpose?

What is the best description of the destructive interference of light? A. a longitudinal wave meets transverse light wave B. two waves have the same direction of displacement C. a mechanical wave meets an electromagnetic wave D.

Frankie and carol are playing tug a war using a rope. if frankie, on the right, pulls with the force of 7n what force is carol exerting on the game if the net force is 4n

Explain why models are often used to study other planets.

The main factors that affect an area's temperature are prevailing winds and mountains. a. True b. False

What is the displacement of an object during a specific unit of time?

Is there an end of rainbow

A downhill skier was able to move 560 meters in 25 seconds. What is the skier's average speed? (Round your answer to the nearest tenth of a meter per second.)