Ap Previous content resource ound has a mass of 136 kg and a radius of 1.60 m and it is rotating with an angular velocity of 0.590 rev/s. What is its angular velocity after a 19.0-kg child gets onto it by grabbing its outer edge? The child is initially at rest. 0.462 rpm Submit Answer Incorrect. Tries 1/10 Previous Tries

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 playground roundabout has a mass of 136 kg and a radius of 1.60 m and it is rotating with an angular velocity of 0.590 revolutions per second (rev/s). What is its angular velocity after a 19.0 kg child gets onto it by grabbing its outer edge? The child is initially at rest.

**User Input:**

- Angular Velocity: 0.462 revolutions per minute (rpm)

**Feedback:**

- Response: Incorrect.
- Attempts: 1 out of 10 

**Additional Options:**

- Link: Previous Tries

---

**Explanation:**

The problem involves the conservation of angular momentum. Initially, the roundabout is spinning with a certain angular velocity. When the child, who is initially at rest, gets onto the roundabout, the system's total angular momentum must be conserved.

**Steps for Solution:**

1. **Identify Initial Conditions:**
   - Mass of roundabout = 136 kg
   - Radius of roundabout = 1.60 m
   - Initial angular velocity = 0.590 rev/s

2. **Include the Child's Mass:**
   - Mass of child = 19.0 kg

3. **Apply Conservation of Angular Momentum:**
   - \( L_{initial} = L_{final} \)
   - \( I_{roundabout} \times \omega_{initial} = (I_{roundabout} + I_{child}) \times \omega_{final} \)

4. **Solve for Final Angular Velocity:**
   - Convert units and calculate accordingly.

This exercise helps reinforce concepts of rotational motion and conservation laws in physics.
Transcribed Image Text:**Problem Statement:** A playground roundabout has a mass of 136 kg and a radius of 1.60 m and it is rotating with an angular velocity of 0.590 revolutions per second (rev/s). What is its angular velocity after a 19.0 kg child gets onto it by grabbing its outer edge? The child is initially at rest. **User Input:** - Angular Velocity: 0.462 revolutions per minute (rpm) **Feedback:** - Response: Incorrect. - Attempts: 1 out of 10 **Additional Options:** - Link: Previous Tries --- **Explanation:** The problem involves the conservation of angular momentum. Initially, the roundabout is spinning with a certain angular velocity. When the child, who is initially at rest, gets onto the roundabout, the system's total angular momentum must be conserved. **Steps for Solution:** 1. **Identify Initial Conditions:** - Mass of roundabout = 136 kg - Radius of roundabout = 1.60 m - Initial angular velocity = 0.590 rev/s 2. **Include the Child's Mass:** - Mass of child = 19.0 kg 3. **Apply Conservation of Angular Momentum:** - \( L_{initial} = L_{final} \) - \( I_{roundabout} \times \omega_{initial} = (I_{roundabout} + I_{child}) \times \omega_{final} \) 4. **Solve for Final Angular Velocity:** - Convert units and calculate accordingly. This exercise helps reinforce concepts of rotational motion and conservation laws in physics.
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