A horse is running at a speed of 12
meters per second. It takes the horse 3
seconds to come to a stop to drink at a
river. The average force needed to bring
the horse to a stop is 1,800 newtons.
What is the mass of the horse?

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures

Describe the basic structure of the atom