If a source of sound waves is rapidly approaching a person the sound heard by the person appears to have

Over the last several decades, scientists have addressed the problem of nonrenewable natural resources such as fossil fuels. Humans are using fossil fuels at a rapid rate and scientists believe that one day we will run out of them.

Which statement best describes metallic bonding? A. A metal atom loses electrons and a nonmetal atom gains them. B. Two nonmetal atom share electrons between them. C. Many atoms give up electrons that can move among the atoms. D.

A ball rolls along the floor with a constant velocity of 6m/s. How far will it go in 10 sec?

Two friends whisper at a volume of 20 decibels. Later, they converse at a volume of 40 decibels. How much greater is the energy intensity of the conversation compared to the whisper? A. 20 times B. 10 times C. 1,000 times D. 100 times

Which set of data would be best illustrated with a bar graph? the effect of hours spent exercising on heart rate the number of skyscrapers in 5 different cities an illustration of how the humidity in the air responds to the temperature of the air

A teacher gives students four liquids commonly found in the kitchen - vinegar, apple juice, dish detergent, and milk - and pH indicator strips, which measure acidity.

What are geothermal heat pumps used for? a. Cooling and heating buildings b. Cooling buildings c. Heating buildings d. Heating water for using in homes

Electromagnetic waves have linear momentum as well as energy. What does this imply about electromagnetic waves?

A humanoid skeleton is found buried in the ashes of a volcano that erupted between 10,000 and 12,000 years ago. when scientists use absolute dating techniques to obtain an age of the fossil, approximately how much carbon-14 isotope will remain?

Two objects exert a gravitational force of 3 N on one another when they are 10 m apart. What would that force be if the distance between the two objects were reduced to 5 m? A. 1.5 N B. 6 N C. 12 N D. 24 N