EXERCISE If the object-spring system is described by x = (0.300 m) cos (1.851), find the following. (a) the amplitude, the angular frequency, the frequency, and the period A = m @= T = (b) the maximum magnitudes of the velocity and the acceleration Vmax= m/s y = rad/s Hz a = = amax m/s² (c) the position, velocity, and acceleration when t = 0.250 s x = m S HINTS: GETTING STARTED I'M STUCK! m/s m/s²

Principles of Physics: A Calculus-Based Text
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ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
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Chapter12: Oscillatory Motion
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EXERCISE
If the object-spring system is described by x = (0.300 m) cos (1.85t), find the following.
(a) the amplitude, the angular frequency, the frequency, and the period
A =
m
@=
f =
a
T =
(b) the maximum magnitudes of the velocity and the acceleration
Vmax
m/s
m/s²
(c) the position, velocity, and acceleration when t = 0.250 s
max
X =
V =
a =
rad/s
Hz
=
S
m
HINTS: GETTING STARTED
m/s
m/s²
I I'M STUCK!
Transcribed Image Text:EXERCISE If the object-spring system is described by x = (0.300 m) cos (1.85t), find the following. (a) the amplitude, the angular frequency, the frequency, and the period A = m @= f = a T = (b) the maximum magnitudes of the velocity and the acceleration Vmax m/s m/s² (c) the position, velocity, and acceleration when t = 0.250 s max X = V = a = rad/s Hz = S m HINTS: GETTING STARTED m/s m/s² I I'M STUCK!
EXAMPLE 13.6 The Vibrating Object-Spring System
GOAL Identify the physical parameters of a harmonic oscillator from its mathematical description.
PROBLEM (a) Find the amplitude, frequency, and period of motion for an object vibrating at the end
of a horizontal spring if the equation for its position as a function of time is
x = (0.250 m) cos(
(b) Find the maximum magnitude of the velocity and acceleration. (c) What are the position,
velocity, and acceleration of the object after 1.00 s has elapsed?
π
8.00
.t).
STRATEGY In part (a) the amplitude and frequency can be found by comparing the given equation with
the standard form, matching up the numerical values with the corresponding terms in the standard form.
In part (b) the maximum speed will occur when the sine function equals 1 or -1, the extreme values of
the sine function (and similarly for the acceleration and the cosine function). In each case, find the
magnitude of the expression in front of the trigonometric function. Part (c) is just a matter of substituting
values into the necessary equations.
SOLUTION
(A) Find the amplitude, frequency, and period.
Write the standard form of the
equation and underneath it write the
given equation.
Equate the factors in front of the
cosine functions to find the amplitude.
The angular frequency w is the factor
in front of t in Equations (1) and (2).
Equate these factors.
Divide w by 27 to get the frequency f.
The period T is the reciprocal of the
frequency.
(1) X = A cos(2лft)
(2) x = (0.250 m) cos(t)
8.00
A = 0.250 m
w = 2πf =
f =
T =
W
2π
π
8.00
rad/s = 0.393 rad/s
= 0.0625 Hz
= 16.0 s
Transcribed Image Text:EXAMPLE 13.6 The Vibrating Object-Spring System GOAL Identify the physical parameters of a harmonic oscillator from its mathematical description. PROBLEM (a) Find the amplitude, frequency, and period of motion for an object vibrating at the end of a horizontal spring if the equation for its position as a function of time is x = (0.250 m) cos( (b) Find the maximum magnitude of the velocity and acceleration. (c) What are the position, velocity, and acceleration of the object after 1.00 s has elapsed? π 8.00 .t). STRATEGY In part (a) the amplitude and frequency can be found by comparing the given equation with the standard form, matching up the numerical values with the corresponding terms in the standard form. In part (b) the maximum speed will occur when the sine function equals 1 or -1, the extreme values of the sine function (and similarly for the acceleration and the cosine function). In each case, find the magnitude of the expression in front of the trigonometric function. Part (c) is just a matter of substituting values into the necessary equations. SOLUTION (A) Find the amplitude, frequency, and period. Write the standard form of the equation and underneath it write the given equation. Equate the factors in front of the cosine functions to find the amplitude. The angular frequency w is the factor in front of t in Equations (1) and (2). Equate these factors. Divide w by 27 to get the frequency f. The period T is the reciprocal of the frequency. (1) X = A cos(2лft) (2) x = (0.250 m) cos(t) 8.00 A = 0.250 m w = 2πf = f = T = W 2π π 8.00 rad/s = 0.393 rad/s = 0.0625 Hz = 16.0 s
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