Question about Dynamics: Mechanics Problems: Newton's Laws
Subject Physics
Physics
Source ENEM
ENEM
Topic Dynamics: Mechanics Problems: Newton's Laws
Dynamics: Mechanics Problems: Newton's Laws
Difficulty Hard
Hard
(ENEM 2014) - Question Hard of Physics
The phenomenon of body levitation occurs on Earth when the gravitational force is balanced, causing an object to hover in the air. Sound can make objects levitate, a phenomenon called acoustic levitation. An acoustic levitator must contain a transducer, which is a vibrating surface that emits sound, and a reflector. Both have concave surfaces to focus the sound, as shown in the illustration. For the levitation indicated in the figure to occur, the force balancing the weight of the object must result from...
a.
Pressure difference between the emitted and reflected sounds applied to the object.
b.
The direct mechanical action of the transducer on the object.
c.
Resonance that occurs between the sound wave and the object.
d.
Pressure that the sound emitted by the transducer applies to the object.
e.
Destructive interference of sound that cancels the movement of the object.
Answer sheet:
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