When you blow some air above a paper strip,the paper rises.This happens because
A)the air above the paper moves faster and the pressure is higher.
B)the air above the paper moves faster and the pressure is lower.
C)the air above the paper moves faster and the pressure remains constant.
D)the air above the paper moves slower and the pressure is higher.
E)the air above the paper moves slower and the pressure is lower.

Question

Quizplus · Accepted Answer

When air is blown above the paper strip, it accelerates and moves faster than the stagnant air below the paper. According to Bernoulli's principle, as the speed of a fluid (in this case, air) increases, the pressure it exerts decreases. Therefore, the pressure above the paper decreases, causing the higher-pressure air below the paper to push the paper upward. This is why the paper rises.

When You Blow Some Air Above a Paper Strip,the Paper