A spool of thread consists of a cylinder of radius R1 = 7.2 cm with end caps of radius R2 = 9.0 cm as depicted in the end view shown in the figure below. The mass of the spool, including the thread, is m = 180 g. The spool is placed on a rough, horizontal surface so that it rolls without slipping when a force T 0.450 N acting to the right is applied to the free end of the thread. For the moment of inertia treat the spool as being a solid cylinder of radius R1, as the extended edges are thin and therefore light.

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### Problem Statement

A spool of thread consists of a cylinder of radius \( R_1 = 7.2 \, \text{cm} \) with end caps of radius \( R_2 = 9.0 \, \text{cm} \) as depicted in the end view shown in the figure below. The mass of the spool, including the thread, is \( m = 180 \, \text{g} \). The spool is placed on a rough, horizontal surface so that it rolls without slipping when a force \( \vec{T} = 0.450 \, \text{N} \) acting to the right is applied to the free end of the thread. For the moment of inertia, treat the spool as being a solid cylinder of radius \( R_1 \), as the extended edges are thin and therefore light.

### Questions

(a) What is the acceleration of the spool? Take positive to be to the right.

[Input box] _____ m/s\(^2\)

(b) Determine the direction of the force of friction.

- ( ) to the left
- ( ) to the right
- ( ) straight up
- ( ) straight down

### Diagram Explanation

The diagram shows a spool on a flat, rough surface with a thread wrapped around it. A force \( \vec{T} \) is applied to the right at the end of the thread. The diagram includes:

- A circle representing the spool with two radii marked: \( R_1 = 7.2 \, \text{cm} \) and \( R_2 = 9.0 \, \text{cm} \).
- An arrow depicting the force \( \vec{T} \) acting to the right.
Transcribed Image Text:### Problem Statement A spool of thread consists of a cylinder of radius \( R_1 = 7.2 \, \text{cm} \) with end caps of radius \( R_2 = 9.0 \, \text{cm} \) as depicted in the end view shown in the figure below. The mass of the spool, including the thread, is \( m = 180 \, \text{g} \). The spool is placed on a rough, horizontal surface so that it rolls without slipping when a force \( \vec{T} = 0.450 \, \text{N} \) acting to the right is applied to the free end of the thread. For the moment of inertia, treat the spool as being a solid cylinder of radius \( R_1 \), as the extended edges are thin and therefore light. ### Questions (a) What is the acceleration of the spool? Take positive to be to the right. [Input box] _____ m/s\(^2\) (b) Determine the direction of the force of friction. - ( ) to the left - ( ) to the right - ( ) straight up - ( ) straight down ### Diagram Explanation The diagram shows a spool on a flat, rough surface with a thread wrapped around it. A force \( \vec{T} \) is applied to the right at the end of the thread. The diagram includes: - A circle representing the spool with two radii marked: \( R_1 = 7.2 \, \text{cm} \) and \( R_2 = 9.0 \, \text{cm} \). - An arrow depicting the force \( \vec{T} \) acting to the right.
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