A racquetball strikes a wall with a speed of 30 m/s and rebounds with a speed of The collision takes What is the average acceleration of the ball during the collision?

200 m/s2

zero

2800 m/s2

1300 m/s2

1500 m/s2

Which of the following numbers most closely represents the number of galaxies in the universe? A) hundreds B) thousands C) millions D) billions

The product of charge through, and potential across, an electrical device is: -voltage -power -amperage -work

Is a object heaver underwater than on land

Scientist who first proposed that thermal convection in the mantle cause continental drift

A 210-kg woorden raft floats on a lake. When a 75-kg man stands on the raft, it sinks 5.0 cm deeper into the water. When he steps off, the raft vibraties for a while. A. What is the frequency of vibration? B.

What makes the lumbar vertebrae different from the cervical vertebrae and the thoracic vertebrae?

Matter has Certain types of what

Identify the type of relationship that exists between density and temperature

You are standing on the sidewalk and see a bus drive by. What would be an ideal frame of reference? A bird flying overhead A jogger running along the sidewalk A car driving alongside the bus A tree across the street

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?