A drill is moving at 6 rad/s when it speeds up at 2 rad/s² for 3 s. Find the angular velocity at the end of the problem

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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**Problem Statement:**

A drill is moving at 6 rad/s when it speeds up at 2 rad/s² for 3 seconds. Find the angular velocity at the end of the problem.

**Options:**
- A) 12 rad/s
- B) 40 rad/s
- C) 4 rad/s
- D) 1 rad/s

**Explanation:**

To solve the problem, we can use the formula for angular velocity under constant angular acceleration:

\[ \omega_f = \omega_i + \alpha \times t \]

Where:
- \( \omega_f \) = final angular velocity,
- \( \omega_i \) = initial angular velocity = 6 rad/s,
- \( \alpha \) = angular acceleration = 2 rad/s²,
- \( t \) = time = 3 s.

Calculating the final angular velocity:

\[ \omega_f = 6 \, \text{rad/s} + (2 \, \text{rad/s}^2 \times 3 \, \text{s}) = 6 \, \text{rad/s} + 6 \, \text{rad/s} = 12 \, \text{rad/s} \]

Thus, the correct answer is A) 12 rad/s.
Transcribed Image Text:**Problem Statement:** A drill is moving at 6 rad/s when it speeds up at 2 rad/s² for 3 seconds. Find the angular velocity at the end of the problem. **Options:** - A) 12 rad/s - B) 40 rad/s - C) 4 rad/s - D) 1 rad/s **Explanation:** To solve the problem, we can use the formula for angular velocity under constant angular acceleration: \[ \omega_f = \omega_i + \alpha \times t \] Where: - \( \omega_f \) = final angular velocity, - \( \omega_i \) = initial angular velocity = 6 rad/s, - \( \alpha \) = angular acceleration = 2 rad/s², - \( t \) = time = 3 s. Calculating the final angular velocity: \[ \omega_f = 6 \, \text{rad/s} + (2 \, \text{rad/s}^2 \times 3 \, \text{s}) = 6 \, \text{rad/s} + 6 \, \text{rad/s} = 12 \, \text{rad/s} \] Thus, the correct answer is A) 12 rad/s.
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