
To find:Sine equation to represent the vibration of the trampoline y as a function of time t .

Answer to Problem 52SGR
y=5sin20πt
Explanation of Solution
Given information:
Amplitude of the function =a=5 feet
Frequency =10 hertz
Concept:
If equation in the form
y=asin(bx)
Then
Amplitude =a
Period =2π|b|
Given
Amplitude of the function =a=5 feet
Frequency =10 hertz
We know
Period is the reciprocal of Frequency
Therefore,
Period =110
Formula for period is
Period =2π|b|
Therefore,
⇒2π|b|=110⇒|b|=2π×10⇒|b|=20π⇒b=±20π
On substituting values in general equation
We get
y=asin(bx)⇒y=5sin(±20πt)⇒y=5sin20πt
Therefore,
Required sine equation is
y=5sin20πt
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