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Amare wants to ride a Ferris wheel that sits four meters above the ground and has a diameter of 50 meters. It takes six minutes to do three revolutions on the Ferris wheel. Complete the function, [tex]h(t)[/tex], which models Amare's height above the ground, in meters, as a function of time, [tex]t[/tex], in minutes. Assume he enters the ride at the low point when [tex]t = 0[/tex].

[tex]h(t) = \square - \sin (\square \pi t + \square \pi) + \square[/tex]


Sagot :

Let's break down and complete the function [tex]\( h(t) \)[/tex] step by step:

1. Vertical shift: The Ferris wheel sits 4 meters above the ground, meaning the equation will be shifted vertically by 4 meters.

2. Amplitude: The diameter of the Ferris wheel is 50 meters, so the radius (which is the amplitude of the sine function) is 25 meters.

3. Angular frequency: The wheel makes three revolutions in six minutes. Therefore, each revolution takes 2 minutes. The angular frequency [tex]\( \omega \)[/tex] in terms of time for one full revolution is [tex]\( 2\pi \)[/tex] radians, but since it takes 2 minutes per revolution, [tex]\( \omega = \pi \)[/tex] radians per minute.

4. Phase shift: Amare starts at the lowest point when [tex]\( t = 0 \)[/tex], which corresponds to a phase shift. Starting at the lowest point means we are at the bottom of a sine wave, which correlates to a phase shift of [tex]\( -\frac{\pi}{2} \)[/tex].

Now, combining these parameters:

[tex]\[ h(t) = \text{vertical shift} - \text{amplitude} \cdot \sin(\text{angular frequency} \cdot t + \text{phase shift}) + \text{center height} \][/tex]

Plugging in the values:

[tex]\[ h(t) = 4 - 25 \cdot \sin(\pi t - \frac{\pi}{2}) + 29 \][/tex]

So, filling in the blank spaces:
[tex]\[ h(t) = \underline{29} - \sin ( \underline{\pi} t + \underline{\frac{1}{2}} \pi ) + \underline{25} \][/tex]

Thus, the complete function is:
[tex]\[ h(t) = 29 - 25\sin(\pi t - \frac{\pi}{2}) \][/tex]
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