Physics: Principles with Applications
Physics: Principles with Applications
6th Edition
ISBN: 9780130606204
Author: Douglas C. Giancoli
Publisher: Prentice Hall
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Chapter 11, Problem 20P
To determine

To Calculate:The frequency of vibration.

Expert Solution & Answer
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Answer to Problem 20P

The frequency of vibration is f = 12π × 2km .

Explanation of Solution

Given info:

Mass of block m kg .

Spring stiffness coefficient (for both spring)  = k  .

Formula used:

  ΣFy = 0 (y is in equilibrium, net force is zero)ΣFy = Fnet (Newton 2nd law of motion)

Here,

  Fy is vertical force,

  Fnet is total net force.

For equilibrium the net force is equal to zero.

Calculation:

When object is completely coincided with x axis and y is at equilibrium, net force is zero in y direction.

  ΣFy = 0 ΣFy = FA + FB - mg = 0FA + FB = mg           (Equation 1)

When object is slightly below the x axis, then we apply the Newton's 2nd law of motion.

  ΣFy = Fnet = FA' + FB' - mg FA' = FA - kxFB' = FB - kxFnet = (FA + FB) - 2kx - mgFA + FB = mg (from equation 1)Fnet = -2kx

This looks like the general formula for the simple harmonic motion, here the effective spring constant is 2k .

  Frequency of vibration f = 12π × keffectivem                                     f = 12π × 2km

Conclusion:

Thus, the frequency of vibration is f = 12π × 2km .

Chapter 11 Solutions

Physics: Principles with Applications

Ch. 11 - Since the density of air decreases with an...Ch. 11 - How did geophysicists determine that part of the...Ch. 11 - Prob. 13QCh. 11 - Prob. 14QCh. 11 - Prob. 15QCh. 11 - Prob. 16QCh. 11 - Prob. 17QCh. 11 - Prob. 18QCh. 11 - Why do the strings used for the lowest-frequency...Ch. 11 - Prob. 20QCh. 11 - Prob. 21QCh. 11 - Prob. 22QCh. 11 - Prob. 1PCh. 11 - Prob. 2PCh. 11 - Prob. 3PCh. 11 - Prob. 4PCh. 11 - Prob. 5PCh. 11 - Prob. 6PCh. 11 - Prob. 7PCh. 11 - Prob. 8PCh. 11 - Prob. 9PCh. 11 - Prob. 10PCh. 11 - Prob. 11PCh. 11 - Prob. 12PCh. 11 - Prob. 13PCh. 11 - Prob. 14PCh. 11 - Prob. 15PCh. 11 - Prob. 16PCh. 11 - Prob. 17PCh. 11 - Prob. 18PCh. 11 - Prob. 19PCh. 11 - Prob. 20PCh. 11 - Prob. 21PCh. 11 - Prob. 22PCh. 11 - Prob. 23PCh. 11 - Prob. 24PCh. 11 - Prob. 25PCh. 11 - Prob. 26PCh. 11 - Prob. 27PCh. 11 - Prob. 28PCh. 11 - Prob. 29PCh. 11 - Prob. 30PCh. 11 - Prob. 31PCh. 11 - Prob. 32PCh. 11 - Prob. 33PCh. 11 - Prob. 34PCh. 11 - Prob. 35PCh. 11 - Prob. 36PCh. 11 - Prob. 37PCh. 11 - Prob. 38PCh. 11 - Prob. 39PCh. 11 - Prob. 40PCh. 11 - Prob. 41PCh. 11 - Prob. 42PCh. 11 - Prob. 43PCh. 11 - Prob. 44PCh. 11 - Prob. 45PCh. 11 - Prob. 46PCh. 11 - Prob. 47PCh. 11 - Prob. 48PCh. 11 - Prob. 49PCh. 11 - Prob. 50PCh. 11 - Prob. 51PCh. 11 - Prob. 52PCh. 11 - Prob. 53PCh. 11 - Prob. 54PCh. 11 - Prob. 55PCh. 11 - Prob. 56PCh. 11 - Prob. 57PCh. 11 - Prob. 58PCh. 11 - Prob. 59PCh. 11 - Prob. 60PCh. 11 - Prob. 61PCh. 11 - Prob. 62PCh. 11 - Prob. 63PCh. 11 - Prob. 64PCh. 11 - Prob. 65PCh. 11 - Prob. 66PCh. 11 - Prob. 67GPCh. 11 - Prob. 68GPCh. 11 - Prob. 69GPCh. 11 - Prob. 70GPCh. 11 - Prob. 71GPCh. 11 - Prob. 72GPCh. 11 - Prob. 73GPCh. 11 - Prob. 74GPCh. 11 - Prob. 75GPCh. 11 - Prob. 76GPCh. 11 - Prob. 77GPCh. 11 - Prob. 78GPCh. 11 - Prob. 79GPCh. 11 - Prob. 80GPCh. 11 - Prob. 81GPCh. 11 - Prob. 82GPCh. 11 - Prob. 83GPCh. 11 - Prob. 84GPCh. 11 - Prob. 85GPCh. 11 - Prob. 86GPCh. 11 - Prob. 87GPCh. 11 - Prob. 88GP
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