waves are generated when a source of energy forces matter in a medium (solid, liquid, or gas) to vibrate. How does the study of the Earth's layers relate to the study of waves

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

What is the primary force that suspension bridges use cables to hold their spans up? a. tension force b. resistance force c. normal force d. elastic force e. applied force