An ultrasound wave vibrates 30,000 times per second. what is the frequency

Which best explains why sound travels fastest through a solid?

A building 190 feet tall casts a 30 foot long shadow. if a person stands at the end of the shadow and looks up to the top of the building, what is the angle of the person's eyes to the top of the building (to the nearest hundredth of a degree) ?

What is the Nitrogen Family

What makes it possible for us to see the moon from earth? A. Light from earth shines on the moon's surface, making it bright. B. The moon absorbs light during the day and reflects that same light back at night. C.

What is the most abundant type of sediment found on the ocean floor? A. Terrigenous B. Biogenous C. Hydrogenous D. Cosmogenous

A motorist driving at 25 meters/second decelerates to 15 meters/second. The combined mass of the vehicle and the driver is 1.5 * 10³ kilograms. What is the amount of mechanical work done by the vehicle?

All forces are different each exerts a particular type of effect on an object

Witch statement about polymers is true

Two bullets have masses of 3,0 g and 6.0g, respectively. both are fired with a speed of 40.0 m/s. Which bullet has more kinetic energy? What is the ratio of their kinetic energies

What does it mean that a form of energy might take more energy to harness than it provides? Are renewable resources always renewable, or can they become non-renewable? Why aren't renewable resources used for everything that we use energy for?