When you blow some air above the upper face of a paper strip, the paper rises. This occurs because
A) the air above the upper face of the paper moves faster, which makes the pressure lower than at the lower face.
B) the air above the upper face of the paper moves faster, which makes the pressure higher than at the lower face.
C) the air above the upper face of the paper moves slower, which makes the pressure lower than at the lower face.
D) the air above the upper face of the paper moves faster but the pressure remains constant.
E) the air above the upper face of the paper moves slower, which makes the pressure higher than at the lower face.
Question 2
Two objects, one of mass m and the other of mass 2 m, are dropped from the top of a building. When they hit the ground:
A) both will have the same kinetic energy.
B) the heavier one will have twice the kinetic energy of the lighter one.
C) the heavier one will have four times the kinetic energy of the lighter one.
D) the heavier one will have half the kinetic energy of the lighter one.
E) the heavier one will have one-fourth the kinetic energy of the lighter one.
Applying a time strip to the IV container.
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