A ball is launched from a 75 meter tower and lands 20 meters away. What was the initial horizontal velocity of the ball? 5.01 m/s
4.22 m/s
3.91 m/s
5.13 m/s

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

What are similarities and differences of reflection, refraction, diffraction and absorption?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.