Ch. 2 - Graphs of the Trigonometric Functions; Inverse Trigonometric Functions

Blitzer3rd EditionTrigonometryISBN: 9780137316601Not the one you use?Change textbook

Blitzer 3rd Edition

Ch. 2 - Graphs of the Trigonometric Functions; Inverse Trigonometric Functions

Problem 28

Chapter 2, Problem 28

In Exercises 21–28, an object moves in simple harmonic motion described by the given equation, where t is measured in seconds and d in inches. In each exercise, find the following: a. the maximum displacement b. the frequency c. the time required for one cycle. d = −4 sin 3π/2 t

Verified step by step guidance

Identify the given equation of motion: \(d = -4 \sin \left( \frac{3\pi}{2} t \right)\). Here, \(d\) represents displacement in inches, and \(t\) is time in seconds.

Determine the maximum displacement by finding the amplitude of the sine function. The amplitude is the absolute value of the coefficient in front of the sine, which is \(|-4|\).

Find the angular frequency \(\omega\) from the argument of the sine function. The argument is \(\frac{3\pi}{2} t\), so \(\omega = \frac{3\pi}{2}\) radians per second.

Calculate the frequency \(f\) using the relationship between angular frequency and frequency: \(f = \frac{\omega}{2\pi}\). Substitute \(\omega = \frac{3\pi}{2}\) to express \(f\) in hertz (cycles per second).

Find the time period \(T\), which is the time required for one complete cycle, using the formula \(T = \frac{1}{f}\). This gives the duration of one full oscillation.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Simple Harmonic Motion (SHM)

Simple Harmonic Motion describes oscillatory motion where the displacement varies sinusoidally with time. The general form is d(t) = A sin(ωt) or d(t) = A cos(ωt), where A is the amplitude, ω is the angular frequency, and t is time. Understanding SHM helps interpret the given equation and extract motion characteristics.

Amplitude and Maximum Displacement

Amplitude is the maximum distance an object moves from its equilibrium position in SHM. It corresponds to the coefficient before the sine or cosine function in the equation. In the given equation, the amplitude is 4 inches, indicating the maximum displacement the object reaches during its motion.

Frequency and Period of Oscillation

Frequency is the number of complete cycles per second, measured in hertz (Hz), and is related to angular frequency ω by f = ω/(2π). The period is the time for one full cycle, given by T = 1/f. These concepts allow calculation of how fast the object oscillates and the duration of each cycle from the equation's angular frequency.

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