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27 Nov 2019

Two positive point charges +q are on the y axis at y = +a and y= −a. A bead of mass m and charge −q slides without friction alonga taut thread that runs along the x axis. Let x be the position ofthe bead.


(a) Show that for x << a, the bead experiences a linearrestoring force (a force that is proportional to x and directedtoward the equilibrium position at x = 0) and therefore undergoessimple harmonic motion. (Do this on paper. Your instructor may askyou to turn in this work.) DON'T WORRY ABOUT THISPART!

(b) Find the period of the motion. (Start with the period of asimple harmonic oscillator. Use the following as necessary: m, a,k, and q.)
T = ______________

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Jarrod Robel
Jarrod RobelLv2
21 Jun 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A stationary ring of radius a lies in the yz plane and has auniform positive charge Q. A small particle that has mass m and anegative charge -q is located at the center of the ring.
(a) Show that if x « a, the electric field along the axis of thering is proportional to x. (Do this on paper. Your instructor mayask you to turn in this work.)

(b) Find the force on the particle as a function of x. (Use thefollowing as necessary: k, q, m, a, Q, and x.)
Fx =

(c) Show that if the particle is given a small displacement in the+x direction, it will perform simple harmonic motion. (Do this onpaper. Your instructor may ask you to turn in this work.)

(d) What is the frequency of that motion? (Use the following asnecessary: k, q, m, a, and Q.)

Good Vibes: Introduction to Oscillations

 

The conditions that lead to simple harmonic motion are as follows:

There must be a position of stable equilibrium.

There must be a restoring force acting on the oscillating object. The direction of this force must always point toward the equilibrium, and its magnitude must be directly proportional to the magnitude of the object's displacement from its equilibrium position. Mathematically, the restoring force F⃗  is given by ⃗, where is the displacement from equilibrium and k is a constant that depends on the properties of the oscillating system.

The resistive forces in the system must be reasonably small.

Consider a block of mass m attached to a spring with force constant k, as shown in the figure(Figure 1) . The spring can be either stretched or compressed. The block slides on a frictionless horizontal surface, as shown. When the spring is relaxed, the block is located at x=0. If the block is pulled to the right a distance A and then released, A will be the amplitude of the resulting oscillations.

Assume that the mechanical energy of the block-spring system remains unchanged in the subsequent motion of the block.

Part A

After the block is released from x=A, it will

(a) remain at rest

(b) move to the left until it reaches equilibrium and stop there. 

(c) move to the left until it reaches x= –A and stop there. 

(d) move to the left until it reaches x=−A and then begin to move to the right.

 

 

 

The time it takes the block to complete one cycle is called the period. Usually, the period is denoted T and is measured in seconds.

The frequency, denoted f, is the number of cycles that are completed per unit of time: f=1/T. In SI units, f is measured in inverse seconds, or hertz (Hz).

Part B

If the period is doubled, the frequency is

(a) unchanged 

(b) doubled 

(c) halved

 

Part C

An oscillating object takes 0.10 s to complete one cycle; that is, its period is 0.10 s. What is its frequency f?

Express your answer in hertz.

 

Part D

If the frequency is 40 Hz, what is the period T?

Express your answer in seconds.

 


The following questions refer to the figure (Figure 2) that graphically depicts the oscillations of the block on the spring.

Note that the vertical axis represents the x-coordinate of the oscillating object, and the horizontal axis represents time.

 

Part E

Which points on the x-axis are located at a distance A from the equilibrium position?

(a) R only

(b) Q only

(c) both R and Q

 

Part F

Suppose that the period is T. Which of the following points on the t-axis are separated by the time interval T?

(a) K and L

(b) K and M 

(c) K and P

(d) L and N 

(e) M and P 

 

 

Now assume for the remaining Parts G - J, that the x coordinate of point R is 0.12 m and the t coordinate of point K is 0.0050 s.

Part G

What is the period T?

Express your answer in seconds.

 

Part H

How much time t does the block take to travel from the point of maximum displacement to the opposite point of maximum displacement?

Express your answer in seconds.

 

Part I

What distance d does the object cover during one period of oscillation?

Express your answer in meters.

 

Part J

What distance d does the object cover between the moments labeled K and N on the graph?

Express your answer in meters.

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