What is resonance and the conditions for resonance? Give examples
What will be an ideal response?
Answer: Resonance is the response of any system when a forcing frequency matches its natural frequency—producing an increase of amplitude. An example is someone pushing another person on a swing. When the pushes are in rhythm with the natural swing motion, the swing soon is high in the air with little effort by the person doing the pushing. Other examples are the sounding of a tuning fork by the vibrations of another nearby tuning fork of matched frequency and the destruction of a bridge when small pushes, stepping or gusts of wind, are applied in rhythm with the natural frequency of the bridge.
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A monkey is sitting at the top of a tree 20 m above ground level. A person standing on the ground wants to feed the monkey
He uses a bow and arrow to launch the food to the monkey. If the person knows that the monkey is going to drop from the tree at the same instant that the person launches the food, how should the person aim the arrow containing the food? Air resistance is small enough to be ignored. A) He should aim it at the monkey. B) He should aim it below the monkey. C) He should aim it above the monkey.
Olber's Paradox is solved in part by the fact that the universe is neither infinitely large nor infinitely old
Indicate whether the statement is true or false
A 4.0-?C charge is situated at the origin of an xy-coordinate system. What is the potential difference between a point x = 4.0 m and y = -4.0 m because of this charge?
A) 18 × 103 V B) -18 × 103 V C) 0 V D) 36 × 103 V E) -36 × 103 V
The length of a certain wire is doubled and at the same time its radius is also doubled. What is the change in the resistance of this wire?
A) It stays the same. B) It is doubled. C) It is quadrupled. D) It is reduced by a factor of 2. E) It is reduced by a factor of 4.