An unknown mineral is scratched by a penny. it must a: be talc b: have a mohs hardness of 10 c: be softer than a diamond d: have perfect cleavage

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?