Explain the main difference between mixtures and compounds

Find the magnitude of a fourth force on the stone that will make the vector sum of the four forces zero.

A typical internal combustion gasoline engine is only about 25% efficient. What happens to the other 75% of the energy? A. It remains in the fuel. B. It is converted to unusable forms of energy. C. It is converted to other usable forms of energy. D.

Carbon dioxide and water molecules in the atmosphere will absorb: a. infrared light. b. visible light. c. ultraviolet light. d. radio waves.

Your friend Saul wears glasses. One day you notice that his eyes look larger through his glasses. What vision problem does Saul most likely have? How do you know?

It takes 6400 years for one gram of radium to decay away to only 1/16 (one-sixteenth) of a gram. The half-life of radium is

Through which type of material does sound tend to travel at the highest speed? A. Sound travels at the same speed in every material B. Solids D. Liquids

How does a low pressure system determine the weather in an area?

Molecules at room temperature move freely. What happens to the molecules when heat is removed until it freezes? Molecules group together Molecules slow down and contract Molecules speed up and expand Molecules move freely

A spring is used in a lab. It is vibrated at different frequencies and the wavelength is recorded. Using the graph of the data, what is the relationship found between frequency and wavelength? A) Frequency and wavelength are inversely related.

How do you describe the frequency of waves perceived by the observer from the moment the source appears to the moment it disappears?