A 1 kg block attached to a spring vibrates with a frequency of 1 Hz on a frictionless horizontal table. Two springs identical to the original spring are attached in parallel to an 8 kg block placed...

A 1 kg block attached to a spring vibrates with a frequency of 1 Hz on a frictionless horizontal table. Two springs identical to the original spring are attached in parallel to an 8 kg block placed on the same table. What is the frequency of vibration of the 8 kg block?

Asked on by lxsptter

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted on

The frequency of oscillation of a mass m when set up as a harmonic oscillator with a spring has a frequency of oscillation F = (1/2*pi)*sqrt(k/m).


The 1 kg block attached to a spring vibrates with a frequency of 1 Hz. This gives the spring constant of the spring as k where (1/2*pi)*sqrt(k/1) = 1

taking the square of both the sides and isolating k

k = 1*4*pi^2*1

=> k = 4*pi^2 N/m

When two of these springs are attached in parallel the resulting spring constant is equal to Keq = 4*pi^2 + 4*pi^2

=> Keq = 8*pi^2

The frequency of vibration of an 8 kg block that is attached to the springs and placed on a frictionless surface is (1/2*pi)*sqrt(8*pi^2/8)

=> (1/2*pi)*(pi)

=> 1/2

The frequency of vibration of the 8 kg block is 1/2 Hz.

Sources:

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