The 100-lb boy at A is suspended from the rope that passes over the quarter circular cliff rock. Determine if it is possible for the 185-lb woman to hoist him up; and if this is possible, what smallest force must she exert on the rope? The coefficient of static friction between the rope and the rock is μ = 0.2, and between the shoes of the woman and the ground μ' = 0.8.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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**Task Description:**

A 100-pound boy (denoted as A) is hanging from a rope that goes over a quarter-circular cliff rock. The objective is to determine if a 185-pound woman can lift the boy, and if so, calculate the minimum force she needs to exert on the rope.

**Parameters:**

- **Weight of the boy**: 100 pounds
- **Weight of the woman**: 185 pounds
- **Coefficient of static friction (rope and rock)**: \( \mu_s = 0.2 \)
- **Coefficient of static friction (shoes and ground)**: \( \mu_s' = 0.8 \)

**Illustration Explanation:**

The image shows:
- A boy suspended over the edge of a cliff by a rope.
- The rope is depicted as passing over a quarter circle cliff, suggesting a change in direction facilitated by the cliff’s curvature.
- A woman stands on top of the cliff, pulling the rope horizontally with the intent to hoist the boy.
- The task requires an understanding of forces, friction, and tension in the rope to solve the dynamics of the system.
Transcribed Image Text:**Task Description:** A 100-pound boy (denoted as A) is hanging from a rope that goes over a quarter-circular cliff rock. The objective is to determine if a 185-pound woman can lift the boy, and if so, calculate the minimum force she needs to exert on the rope. **Parameters:** - **Weight of the boy**: 100 pounds - **Weight of the woman**: 185 pounds - **Coefficient of static friction (rope and rock)**: \( \mu_s = 0.2 \) - **Coefficient of static friction (shoes and ground)**: \( \mu_s' = 0.8 \) **Illustration Explanation:** The image shows: - A boy suspended over the edge of a cliff by a rope. - The rope is depicted as passing over a quarter circle cliff, suggesting a change in direction facilitated by the cliff’s curvature. - A woman stands on top of the cliff, pulling the rope horizontally with the intent to hoist the boy. - The task requires an understanding of forces, friction, and tension in the rope to solve the dynamics of the system.
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