Copyright

A Ferris wheel with a diameter of 156 feet was built in a city. The top of the wheel stands 161...

Question:

A Ferris wheel with a diameter of 156 feet was built in a city. The top of the wheel stands 161 above the ground. Use the diagram in the figure below as a model of the wheel. Round your answers to the nearest number.

Ferris wheel:

A Ferris wheel is an amusement ride consisting of a large vertical revolving wheel with passenger seats attached to the rim of the giant wheel and the Ferris wheel is attached to the ground rigidly through its center.

Here, we will be using trigonometric identities to solve for the value of h at different angles given.

Answer and Explanation: 1

Given:

Diameter of Ferris wheel = 156 feet

The radius of the Ferris wheel is 78 feet

The distance between the {eq}p_{o}\; {/eq} and ground level = 161 - 156 = 5 feet

Distance between the center and the ground level = 161 feet

From, the figure:

AC = AB - h

AC = 161 - h

(a)

{eq}\theta = 150^{\circ}\\ \text{Using trigonometric formula}\\ \cos \theta = \frac{161 - h}{78}\\ \cos 150^{\circ} = \frac{161 - h}{78} - 67.55 = 161 - h\\ h = 228.55\; feet {/eq}

(b)

{eq}\theta = 240^{\circ}\\ \text{Using trigonometric formula}\\ \cos \theta = \frac{161 - h}{78}\\ \cos 240^{\circ} = \frac{161 - h}{78}\\ -39 = 161 - h\\ h = 200\; feet {/eq}

(c)

{eq}\theta = 315^{\circ}\\ \text{Using trigonometric formula}\\ \cos \theta = \frac{161 - h}{78}\\ \cos 315^{\circ} = \frac{161 - h}{78}\\ 55.154 = 161 - h\\ h = 105.84\; feet {/eq}


Learn more about this topic:

Loading...
Trigonometry: Sine and Cosine

from

Chapter 4 / Lesson 6
38K

Sine and cosine are basic trigonometric functions that are used to solve for the angles and sides of triangles. Review trigonometry concepts and learn about the mnemonic used for sine, cosine, and tangent functions.


Related to this Question

Explore our homework questions and answers library