5) A carousel has a radius of 18 feet and takes 29 seconds to make one complete revolution. What is the linear speed of the carousel at its outside edge? Express the answer in feet per second. If necessary, round the answer to two decimal places. A) 0.62 feet per second C) 10.12 feet per second B) 113.1 feet per second D) 3.9 feet per second

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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**Question 5:**

A carousel has a radius of 18 feet and takes 29 seconds to make one complete revolution. What is the linear speed of the carousel at its outside edge? Express the answer in feet per second. If necessary, round the answer to two decimal places.

- A) 0.62 feet per second
- B) 113.1 feet per second
- C) 10.12 feet per second
- D) 3.9 feet per second

---

**Explanation:**

To calculate the linear speed of the carousel, we need to find the circumference of the circle and then divide it by the time it takes to make one complete revolution.

1. **Circumference of the Carousel:**

   The formula for the circumference \( C \) of a circle is given by:

   \[
   C = 2 \pi r
   \]

   where \( r \) is the radius. For this carousel, the radius is 18 feet. So, the circumference is:

   \[
   C = 2 \pi \times 18 = 36 \pi \text{ feet}
   \]

2. **Linear Speed Calculation:**

   Linear speed \( v \) is calculated by dividing the circumference by the time \( t \) taken for one revolution:

   \[
   v = \frac{C}{t} = \frac{36 \pi}{29}
   \]

   Using the approximation \( \pi \approx 3.14159 \):

   \[
   v \approx \frac{36 \times 3.14159}{29} \approx 3.90 \text{ feet per second}
   \]

Thus, the correct answer is **D) 3.9 feet per second**.
Transcribed Image Text:**Question 5:** A carousel has a radius of 18 feet and takes 29 seconds to make one complete revolution. What is the linear speed of the carousel at its outside edge? Express the answer in feet per second. If necessary, round the answer to two decimal places. - A) 0.62 feet per second - B) 113.1 feet per second - C) 10.12 feet per second - D) 3.9 feet per second --- **Explanation:** To calculate the linear speed of the carousel, we need to find the circumference of the circle and then divide it by the time it takes to make one complete revolution. 1. **Circumference of the Carousel:** The formula for the circumference \( C \) of a circle is given by: \[ C = 2 \pi r \] where \( r \) is the radius. For this carousel, the radius is 18 feet. So, the circumference is: \[ C = 2 \pi \times 18 = 36 \pi \text{ feet} \] 2. **Linear Speed Calculation:** Linear speed \( v \) is calculated by dividing the circumference by the time \( t \) taken for one revolution: \[ v = \frac{C}{t} = \frac{36 \pi}{29} \] Using the approximation \( \pi \approx 3.14159 \): \[ v \approx \frac{36 \times 3.14159}{29} \approx 3.90 \text{ feet per second} \] Thus, the correct answer is **D) 3.9 feet per second**.
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