When sunlight strikes Earth, approximately
a. 30% is reflected back into space
70% is reflected back into space
c. 50% is absorbed by the atmosphere
d. 80% is absorbed by land and oceans
b.
700

=force × distance a. work b. velocity c. pressure d. momentum

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Ateacher gives students four liquids commonly found in the kitchen - vinegar, apple juice, dish detergent, and milk - and ph indicator strips, which measure acidity. the teacher asks the students to put the liquids in order from most acidic to most basic. what type of investigation could the students conduct to determine the correct order for the liquids?