Fluorine-21 has a half-life of approximately 5 seconds. What percentage of the original nuclei would remain after 20 seconds

If you are walking or running at equal distances in equal amounts of time you are traveling at a (n) ___.

A piece of solid copper, at 10oC, is dropped into a graduated cylinder of 100°C water. Which statement BEST describes the change in heat energy in this system? A) Both water and copper temperatures decrease.

A car is moving towards a student at constant speed. The student notices that the sound the car makes gets louder and louder as the car approaches.

How are the 3 steps of scientific inquiry related

A certain cable of an elevator is designed to exert a force of 4.5x 104 N. If the maximum acceleration that a loaded car can withstand is 3.5 m/s2 (the current fastest elevators in the world undergo an acceleration of less than 3.

In a system, 45 J of work is done on a car using a 65 N force. How far does the car move

A girl pulls on a 10-kg wagon with a constant horizontal force of 30 n. if there are no other horizontal forces, what is the wagon's acceleration in meters per second per second?

What is the gravitational force excerted on an object called?

Fluorine-21 has a half-life of approximately 5 seconds. What percentage of the original nuclei would remain after 20 seconds

How does friction affect the distance of an object?