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Thank you for your help. Here is a new model built by my friends. Even though this model is not perfect (don't consider the table and hand will also vibrate with phone), I think it is good enough for me to explain it. In this mode, phone equilibrium changes according to applied force. However, it is impossible to go below the table since the phone is ...

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In the general case the frequency of a wave and its kinetic energy are not related. As you can derive from Energizer 777's answer one can increase the frequency and this time decrease the amplitude of the wave generator and you approximately need the same amount of energy to support the damping of the wave from dissipation processes. The point is that an ...

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thanks for the reply. Here are two candidate answers I got from my friends and the other forum: Vibration amplitude decreases because the system damping factor is increased when the force of hand is applied Effective mass is increased when force is applied (because the table is vibrating also with the phone) Both of those factors are not considered on ...

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I think the reason is that you are just adding these two forces i.e. Force by hand and Force by the vibrating mechanism. But you have to understand that the hand comes in contact to the mobile surface only when the surface is going up(towards the hand) i.e. when the positive cycle of the vibration is taking place. When the vibration is moving on the other ...

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The frequency of a standing wave on a guitar string is given by $$f = \frac{v}{2L}$$ where $v$ is the velocity, and $L$ is the length of the string. It can be shown by using the wave equation (which I'll skip, as it is a more complex derivation) that the velocity of a wave on a string is related to the tension in the string and the mass per unit length, ...

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In the equipartition theorem, "degrees of freedom" mean independent ways to access energy states. It is different from "degrees of freedom" intended as Lagrangian coordinates, or position coordinates. For example, the one-dimensional free particle has 2 Lagrangian coordinates but only one way to change its kinetic energy (velocity): this is why it is the ...

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