Which of the following shows that an energy transformation has taken place? A. matter is destroyed B. heat is produced C. matter is created D. there is no change

Suppose you are walking home after school. The distance from school to your home is five kilometers. On foot, you can get home in 25 minutes. However, if you rode a bicycle, you could get home in 10 minutes. a.

Which of the following would not increase the velocity of a sound wave in air? A. increasing the temperature of the air. B. lowering the density of the air. C. lowering the humidity of the air. D.

What is meant by an electrical current

A player throws a football 50.0 m at 61.0° north of west. what is the westward component of the displacement of the football?

Two cars collide on the parkway. The drivers are following too closely and the driver in the front slows because of traffic to a velocity of 20.0m/s and the driver behind is still moving at 30.

In which region of the periodic table do the elements NOT normally react chemically with other elements? A. metals B. metalloids C. nonmetals D. noble gases

A hot air ballon was a mass of 400 kilograms moves across the sky with 3200 joules of kinetic energy. the velocity of the balloon is

What Is a mineral made of oxidized hydrogen

If you were to go to space, and took your helmet of the suit off while your out side of the rocket, what would happen?

In Step 5, you will calculate H+/OH - ratios for more extreme pH solutions. Find the concentration of H + ions to OH - ions listed in Table B of your Student Guide for a solution at a pH = 2.