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Force vibrations and resonance ....

Force vibrations and resonance .

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Distinguish between forced vibrations and resonance. Draw neat, labelled diagrams for the modes of vibration of a streched string in second harmonic and third harmonic. The area of the upper face of a rectangular block is 0.5mxx0.5m and the lower face is fixed. The height of the block is 1cm . A shearing force applied at the top face produces a displacement of 0.015 mm . Find the strain and shearing force. (Modulus of rigidity : eta=4.5xx10^(10)N//m^(2) )

What are forced vibrations and resonance ? Show that only odd harmonics are present in an air column vibrating in a pipe closed at one end. A stretched wire emits a fundamental note of frequency 256 Hz. Keeping the stretching force constant and reducing length of the wire by 10cm, the frequency becomes 320 Hz. Calculate the original length of wire.

In case of a force vibration the resonance wave becomes very step when the

In case of a forced vibration, the resonance wave becomes very sharp when the

In the absence of damping the amplitude of forced oscillation at resonance will be

Free vibrations and forced vibrations.

Why and how is the the force of vibrations increased in the middle ear ?

A sonometer wire is vibrating is resonance with a tuning frok. Keeping the tension applied same, the length of the wire is dourbled. Under what conditions would the tuning fork still be in resonance with the wire?

Resonance produces louder sound than that produced by the forced vibrations of a body . Why then is resonance purposely avoided in many instruments ?