/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 54 An oscillator consists of a bloc... [FREE SOLUTION] | 91Ó°ÊÓ

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An oscillator consists of a block attached to a spring \((k=425 \mathrm{~N} / \mathrm{m})\). At some time \(t\), the position (measured from the system's equilibrium location), velocity, and acceleration of the block are \(x=0.100 \mathrm{~m}, v=-13.6 \mathrm{~m} / \mathrm{s}\), and \(a=-123 \mathrm{~m} / \mathrm{s}^{2}\). Calculate (a) the frequency of oscillation, (b) the mass of the block, and (c) the amplitude of the motion.

Short Answer

Expert verified
Frequency: 5.58 Hz; Mass: 0.345 kg; Amplitude: 0.387 m.

Step by step solution

01

Determine the Frequency of Oscillation

To find the frequency of the oscillation, use the formula for the angular frequency \( \omega \) of a simple harmonic oscillator, which is given by\[ \omega = \sqrt{\frac{k}{m}} \]where \( k = 425 \, \mathrm{N/m} \) is the spring constant and \( m \) is the mass of the block. But first, calculate the frequency \( f \) from \( \omega \) using:\[ f = \frac{\omega}{2\pi} \]The period \( T \) is given by the relation \( T = \frac{1}{f} \). However, since \( m \) is unknown, we'll explore further steps involving the mass and then substitute back to determine the frequency.
02

Find the Mass of the Block Using Acceleration

The acceleration \( a \) of a block in simple harmonic motion can be given by the equation:\[ a = -\omega^2 x \]We use the given values \( x = 0.100 \, \mathrm{m} \) and \( a = -123 \, \mathrm{m/s}^2 \) to find \( \omega \):\[ -123 = -\omega^2 \, 0.100 \]\[ \omega^2 = \frac{123}{0.100} = 1230 \, \mathrm{rad^2/s^2} \]This leads to \( \omega = \sqrt{1230} \, \mathrm{rad/s} \). Now solve for the mass \( m \):\[ \omega = \sqrt{\frac{425}{m}} = \sqrt{1230} \]Square both sides and solve for \( m \):\[ \frac{425}{m} = 1230 \]\[ m = \frac{425}{1230} \approx 0.345 \mathrm{~kg} \].
03

Calculate the Frequency of Oscillation

Now that the mass \( m \) is known, substitute back into the formula for \( \omega \),\[ \omega = \sqrt{\frac{425}{0.345}} = \sqrt{1230} \]Since this has been validated with acceleration, we can calculate the frequency:\[ f = \frac{\omega}{2\pi} = \frac{\sqrt{1230}}{2\pi} \approx \frac{35.066}{2\pi} \approx 5.58 \, \mathrm{Hz} \].
04

Determine the Amplitude of the Motion

The amplitude \( A \) of simple harmonic motion can be found using the equation:\[ v^2 = \omega^2 (A^2 - x^2) \]With \( v = -13.6 \, \mathrm{m/s}, \omega^2 = 1230, \) and \( x = 0.100 \, \mathrm{m} \), we plug values in:\[ (-13.6)^2 = 1230 (A^2 - 0.100^2) \]\[ 184.96 = 1230 (A^2 - 0.01) \]\[ \frac{184.96}{1230} = A^2 - 0.01 \]\[ A^2 = \frac{184.96}{1230} + 0.01 \approx 0.15 \]Thus, \( A = \sqrt{0.15} \approx 0.387 \mathrm{~m} \).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Frequency of Oscillation
The frequency of oscillation tells us how many cycles an oscillator completes in one second. This is a key aspect of simple harmonic motion as it helps us understand the rhythm of oscillations. In our exercise, we started with determining the angular frequency, represented as \( \omega \), using the formula:\[ \omega = \sqrt{\frac{k}{m}} \]where \( k \) is the spring constant. After finding the angular frequency, the frequency \( f \) can be calculated using:\[ f = \frac{\omega}{2\pi} \]This conversion is crucial because it takes us from the angular speed to the oscillations per second. In our particular example, after finding the mass, the calculated frequency came out to about \(5.58 \, \mathrm{Hz}\). It means the block-spring system oscillates about 5.58 times each second. Understanding this can give tangible insights into how fast or slow an oscillating system moves back and forth.
Mass of the Block
The mass of the block in harmonic motion plays a crucial role in determining the system's dynamics. In simple harmonic motion, the block's mass directly influences the overall inertia of the system.To find the mass, we rearranged the acceleration equation:\[ a = -\omega^2 x \]Using the positional and acceleration data given, we first solve for \( \omega \), the angular frequency, and then transform it to find the mass \( m \) by restating this in terms of \( m \):\[ \omega = \sqrt{\frac{425}{m}} \]By squaring both sides and isolating \( m \), we calculated the approximate mass to be around \(0.345 \, \mathrm{kg}\). This calculation is essential because mass affects how tightly or loosely an oscillator moves around its equilibrium point. A lower mass generally means quicker oscillations, while a higher mass implies slower oscillations.
Amplitude of Motion
The amplitude of motion is a measure of how far the block travels from its equilibrium point during oscillations. It represents the maximum extent of displacement and is a fundamental characteristic of oscillatory motion.To determine the amplitude \( A \), we used the velocity relation of simple harmonic motion:\[ v^2 = \omega^2 (A^2 - x^2) \]Given the velocity \( v = -13.6 \, \mathrm{m/s} \), along with our calculated \( \omega^2 \) and position \( x = 0.100 \, \mathrm{m} \), we proceed by solving for \( A^2 \) and thus for \( A \):\[ A^2 = \frac{184.96}{1230} + 0.01 \]By simplifying it, the amplitude results in approximately \(0.387 \, \mathrm{m}\). Amplitude is critical as it indicates the maximum potential energy stored in the system and shapes how vigorous or subtle the oscillations are. It ultimately defines the bounds within which the block oscillates around its equilibrium position.

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Most popular questions from this chapter

A block is on a horizontal surface (a shake table) that is moving back and forth horizontally with simple harmonic motion of frequency \(2.0 \mathrm{~Hz}\). The coefficient of static friction between block and surface is \(0.45\). How great can the amplitude of the SHM be if the block is not to slip along the surface?

A \(10 \mathrm{~g}\) particle undergoes SHM with an amplitude of \(2.0 \mathrm{~mm}\), a maximum acceleration of magnitude \(6.5 \times 10^{3} \mathrm{~m} / \mathrm{s}^{2}\), and an unknown phase constant \(\phi\). What are (a) the period of the motion, (b) the maximum speed of the particle, and (c) the total mechanical energy of the oscillator? What is the magnitude of the force on the particle when the particle is at (d) its maximum displacement and (e) half its maximum displacement?

The suspension system of a \(2400 \mathrm{~kg}\) automobile "sags" \(10 \mathrm{~cm}\) when the chassis is placed on it. Also, the oscillation amplitude decreases by \(50 \%\) each cycle. Estimate the values of (a) the spring constant \(k\) and (b) the damping constant \(b\) for the spring and shock absorber system of one wheel, assuming each wheel supports \(600 \mathrm{~kg}\).

Two particles oscillate in simple harmonic motion along a common straight-line segment of length \(A\). Each particle has a period of \(1.5 \mathrm{~s}\), but they differ in phase by \(\pi / 6 \mathrm{rad}\). (a) How far apart are they (in terms of \(A\) ) \(0.60 \mathrm{~s}\) after the lagging particle leaves one end of the path? (b) Are they then moving in the same direction, toward each other, or away from each other?

An object undergoing simple harmonic motion takes \(0.25 \mathrm{~s}\) to travel from one point of zero velocity to the next such point. The distance between those points is \(32 \mathrm{~cm}\). Calculate the (a) period, (b) frequency, and (c) amplitude of the motion.

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