Which statement best describes a wave?

a. a collision of particles

b. a disturbance that carries energy

c. a movement of fluids

d. a group of electrically charged molecules

Do tectonic plates cover most of earth but not all of it?

Which nuclei is NOT radioactive?

Which of the following items would have the lowest density? OA. A 12 cm3 block of aluminum with a mass of 2 grams OB. A6 cm3 block of ice with a mass of 4 grams OC. A 12 cm3 block of wood with a mass of 3 grams OD.

Why would a large amount of hot water feel hotter than a small amount of hot water

SI units are useful because they are all related by multiples of

When a siren is approaching you, how does the wavelength of the waves reaching you compare to the actual wavelength that the siren emits?

In a harbor, you can see sea waves traveling around the edges of small stationary boats. Why does this happen?

Correct unit of speed

Technician A says that for best results, loosen the fastener immediately after spraying it with penetrating oil. Technician B says that rusted fasteners may be loosened by tapping with a hammer. Which technician is correct? a. technician A only b.

A roller coaster track is 3,000 meters long. It takes 100 seconds to travel once around the roller coaster. Is the velocity constant throughout the trip? Explain.