8-45. The man has a mass of 60 kg and the crate has a mass of 100 kg. If the coefficient of static friction between his shoes and the ground is , = 0.4 and between the crate and the ground is c 0.3, determine if the man is able to move the crate using the rope-and-pulley system shown. 8 = C 30° A 45° B

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**Problem 8-45.**

The man has a mass of 60 kg and the crate has a mass of 100 kg. If the coefficient of static friction between his shoes and the ground is \( \mu_s = 0.4 \) and between the crate and the ground is \( \mu_c = 0.3 \), determine if the man is able to move the crate using the rope-and-pulley system shown.

**Diagram Explanation:**

The diagram illustrates a scenario where a man is attempting to pull a crate using a rope-and-pulley system. The setup is as follows:

- **Crate (C):** Positioned on the ground with a rope attached.
- **Rope:** Connects the crate to a pulley system and extends to the man.
- **Pulley on Tree:** The rope runs over a pulley mounted on a tree which redirects the rope.
- **Angles:** 
  - The rope between the crate and tree forms a \(30^\circ\) angle with the horizontal.
  - The rope between the tree and the man makes a \(45^\circ\) angle with the horizontal.
- **Man (A):** Pulling on the rope with the intention of moving the crate.

This arrangement tests the application of principles of static friction and mechanical advantage through a pulley system. The diagram is designed to visually support the problem-solving process by depicting the forces and angles involved.
Transcribed Image Text:**Problem 8-45.** The man has a mass of 60 kg and the crate has a mass of 100 kg. If the coefficient of static friction between his shoes and the ground is \( \mu_s = 0.4 \) and between the crate and the ground is \( \mu_c = 0.3 \), determine if the man is able to move the crate using the rope-and-pulley system shown. **Diagram Explanation:** The diagram illustrates a scenario where a man is attempting to pull a crate using a rope-and-pulley system. The setup is as follows: - **Crate (C):** Positioned on the ground with a rope attached. - **Rope:** Connects the crate to a pulley system and extends to the man. - **Pulley on Tree:** The rope runs over a pulley mounted on a tree which redirects the rope. - **Angles:** - The rope between the crate and tree forms a \(30^\circ\) angle with the horizontal. - The rope between the tree and the man makes a \(45^\circ\) angle with the horizontal. - **Man (A):** Pulling on the rope with the intention of moving the crate. This arrangement tests the application of principles of static friction and mechanical advantage through a pulley system. The diagram is designed to visually support the problem-solving process by depicting the forces and angles involved.
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