Q7) A uniform cylinder has mass m = 1.95 kg and radius r= 1.96 m. The cylinder touches both a solid wall and the ground as shown in the figure. The coefficient of kinetic friction between the cylinder and both the ground and the solid wall is uk = 0.205 A massless string is wound around the cylinder. A horizontal force of magnitude F = 20.9 N is applied to the string and it unwinds with the string not slipping. The cylinder is rotating around its central axis (denoted by an x in the figure), but otherwise not moving.

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### Physics Problem: Cylinder Dynamics

**Q7) A uniform cylinder has mass m = 1.95 kg and radius r = 1.96 m.**

The cylinder touches both a solid wall and the ground as shown in the figure. The coefficient of kinetic friction between the cylinder and both the ground and the solid wall is \(\mu_k = 0.205\).

A massless string is wound around the cylinder. A horizontal force of magnitude \( F = 20.9 \, \text{N} \) is applied to the string and it unwinds with the string not slipping. The cylinder is rotating around its central axis (denoted by an \( x \) in the figure), but otherwise not moving.

Below is the diagram illustrating the problem setup:
- The cylinder (represented as a blue circle) has its radius marked as \( r \) and its central axis is denoted by \( x \).
- The cylinder makes contact with a solid vertical wall and a horizontal ground.
- An arrow labeled \( \vec{F} \) points horizontally to the right, illustrating the direction of the applied force.

**Questions:**

a) Calculate the magnitude of the normal force that the wall exerts on the cylinder.

b) Calculate the magnitude of the angular acceleration of the cylinder.

### Explanation of the Diagram:

- **Cylinder**: Depicted as a blue circle with radius \( r \).
- **Central Axis (x)**: Marked within the cylinder.
- **Applied Force (\( \vec{F} \))**: Shown as a horizontal arrow to the right, indicating the direction of the force applied via the string.
- **Contact with Wall and Ground**: Illustrates the points of contact where friction forces are active due to the wall and the ground.

In this problem, students are asked to analyze the dynamics of a cylinder under the influence of a horizontal force while considering the effects of friction and calculate the corresponding normal force and angular acceleration.
Transcribed Image Text:### Physics Problem: Cylinder Dynamics **Q7) A uniform cylinder has mass m = 1.95 kg and radius r = 1.96 m.** The cylinder touches both a solid wall and the ground as shown in the figure. The coefficient of kinetic friction between the cylinder and both the ground and the solid wall is \(\mu_k = 0.205\). A massless string is wound around the cylinder. A horizontal force of magnitude \( F = 20.9 \, \text{N} \) is applied to the string and it unwinds with the string not slipping. The cylinder is rotating around its central axis (denoted by an \( x \) in the figure), but otherwise not moving. Below is the diagram illustrating the problem setup: - The cylinder (represented as a blue circle) has its radius marked as \( r \) and its central axis is denoted by \( x \). - The cylinder makes contact with a solid vertical wall and a horizontal ground. - An arrow labeled \( \vec{F} \) points horizontally to the right, illustrating the direction of the applied force. **Questions:** a) Calculate the magnitude of the normal force that the wall exerts on the cylinder. b) Calculate the magnitude of the angular acceleration of the cylinder. ### Explanation of the Diagram: - **Cylinder**: Depicted as a blue circle with radius \( r \). - **Central Axis (x)**: Marked within the cylinder. - **Applied Force (\( \vec{F} \))**: Shown as a horizontal arrow to the right, indicating the direction of the force applied via the string. - **Contact with Wall and Ground**: Illustrates the points of contact where friction forces are active due to the wall and the ground. In this problem, students are asked to analyze the dynamics of a cylinder under the influence of a horizontal force while considering the effects of friction and calculate the corresponding normal force and angular acceleration.
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