Problem 4: A merry-go-round is a playground ride that consists of a large disk mounted to that it can freely rotate in a horizontal plane. The merry-go-round shown is initially at rest, has a radius R = 1.1 meters, and a mass M= 286 kg. A small boy of mass m = 41 kg runs tangentially to the merry-go-round at a speed of v = 2.5 m/s, and jumps on.

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Chapter1: Units, Trigonometry. And Vectors
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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 4:**

A merry-go-round is a playground ride that consists of a large disk mounted to rotate freely in a horizontal plane. The merry-go-round is initially at rest, with a radius \( R = 1.1 \) meters and a mass \( M = 286 \) kg. A small boy of mass \( m = 41 \) kg runs tangentially to the merry-go-round at a speed of \( v = 2.5 \) m/s and jumps on.

**Randomized Variables:**
- \( R = 1.1 \) meters
- \( M = 286 \) kg
- \( m = 41 \) kg
- \( v = 2.5 \) m/s

**Part (a)**
Calculate the moment of inertia of the merry-go-round, in kg·m².

- \( I = 178 \) ✔ Correct!

**Part (b)**
Immediately before the boy jumps on the merry-go-round, calculate his angular speed (in radians/second) about the central axis of the merry-go-round.

- \( \omega_1 = 2.27 \) ✔ Correct!

**Part (c)**
Immediately after the boy jumps on the merry-go-round, calculate the angular speed in radians/second of the merry-go-round and boy.

- \( \omega_2 = 0.5 \) ✔ Correct!

**Part (d)**
The boy then crawls towards the center of the merry-go-round along a radius. What is the angular speed in radians/second of the merry-go-round when the boy is halfway between the edge and the center of the merry-go-round?

- \( \omega_3 = 0.59 \) ✔ Correct!

**Part (e)**
The boy then crawls to the center of the merry-go-round. What is the angular speed in radians/second of the merry-go-round when the boy is at the center?

- Input: \( \omega_4 = 0.63 \) 

**Diagram Explanation:**
The diagram shows a merry-go-round with a silhouette of a boy approaching it tangentially. The structure is depicted with various colored sections and handrails, indicating a typical playground setup.
Transcribed Image Text:**Problem 4:** A merry-go-round is a playground ride that consists of a large disk mounted to rotate freely in a horizontal plane. The merry-go-round is initially at rest, with a radius \( R = 1.1 \) meters and a mass \( M = 286 \) kg. A small boy of mass \( m = 41 \) kg runs tangentially to the merry-go-round at a speed of \( v = 2.5 \) m/s and jumps on. **Randomized Variables:** - \( R = 1.1 \) meters - \( M = 286 \) kg - \( m = 41 \) kg - \( v = 2.5 \) m/s **Part (a)** Calculate the moment of inertia of the merry-go-round, in kg·m². - \( I = 178 \) ✔ Correct! **Part (b)** Immediately before the boy jumps on the merry-go-round, calculate his angular speed (in radians/second) about the central axis of the merry-go-round. - \( \omega_1 = 2.27 \) ✔ Correct! **Part (c)** Immediately after the boy jumps on the merry-go-round, calculate the angular speed in radians/second of the merry-go-round and boy. - \( \omega_2 = 0.5 \) ✔ Correct! **Part (d)** The boy then crawls towards the center of the merry-go-round along a radius. What is the angular speed in radians/second of the merry-go-round when the boy is halfway between the edge and the center of the merry-go-round? - \( \omega_3 = 0.59 \) ✔ Correct! **Part (e)** The boy then crawls to the center of the merry-go-round. What is the angular speed in radians/second of the merry-go-round when the boy is at the center? - Input: \( \omega_4 = 0.63 \) **Diagram Explanation:** The diagram shows a merry-go-round with a silhouette of a boy approaching it tangentially. The structure is depicted with various colored sections and handrails, indicating a typical playground setup.
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