A substance that cannot be broken down into simpler substances is called an

A. atom

B. element

C. solution

D. homogeneous mixture

A narrow region between two air masses of different densities is a

Two families meet at the park at 10:00am. Each family uses a different way of transportation to get there. The Gonzalez family leaves at 9:00am and drives 90 km on a highway. The Rivera leave at 9:30am and ride the train 30km.

If stationary observers measure the shape of a pass - ing object to be exactly circular, what is the shape of the object when viewed face-on by observers on board the object, traveling with it?

A chemist must dilute 58.00ml of 13.5 aqueous silver (II) oxide solution until the concentration falls to 5.00M. He'll do this by adding distilled water to the solution until it reaches a certain final volume.

How are the input and output forces of the parts of a compound machine related?

Objects can be accelerating and traveling at constant velocity at the same time. True or False

What kind of star gives rise to a type i supernova? a. white dwarf stars b. massive main sequence stars c. red giant stars?

Example of an object in motion

A proton and an alpha particle are momentarily at rest at a distance r from each other. They then begin to move apart. Find the speed of the proton by the time the distance between the proton and the alpha particle doubles.

Why is it a good idea to extend your bare hand forward when you are getting ready to catch a fast-moving baseball? a. So you can catch the ball with a stiff arm, increasing the time to slow the ball thus deceasing the force. b.