A piece of mohair taken from an Angora goat has a radius of 31x10°° m. What is the least number of identical pieces of mohair needed to suspend a 79-kg person, so the strain experienced by each piece is less than 0.010? Assume that the tension is the same in all the pieces.

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
icon
Related questions
icon
Concept explainers
Question
**Problem Statement:**

A piece of mohair taken from an Angora goat has a radius of \(3 \times 10^{-5}\) m. What is the least number of identical pieces of mohair needed to suspend a 79-kg person, so the strain experienced by each piece is less than 0.010? Assume that the tension is the same in all the pieces.

**Solution Approach:**

1. **Calculate the stress (σ)** on a single mohair fiber:
   \[
   \sigma = \frac{F}{A}
   \]
   where \( F \) is the force exerted by the person's weight (mass \(\times\) gravity),
   and \( A \) is the cross-sectional area of the mohair fiber ( \( \pi r^2 \) ).

2. **Determine the number of pieces (n) needed** such that the strain (ɛ) experienced by each is less than 0.010:
   \[
   \epsilon = \frac{\sigma}{E}
   \]
   where \( E \) is Young's modulus of mohair.

3. Reorganize the equation and solve for \( n \).

**Key Assumptions:**
- The tension is equally distributed among all pieces.
- Young's modulus of mohair is provided or known from material properties.

**Graph and Diagram Description:**
- No graphs or diagrams present in this problem statement. 

This problem involves concepts of material science and strength of materials, particularly understanding mechanical stress, strain, and elasticity.
Transcribed Image Text:**Problem Statement:** A piece of mohair taken from an Angora goat has a radius of \(3 \times 10^{-5}\) m. What is the least number of identical pieces of mohair needed to suspend a 79-kg person, so the strain experienced by each piece is less than 0.010? Assume that the tension is the same in all the pieces. **Solution Approach:** 1. **Calculate the stress (σ)** on a single mohair fiber: \[ \sigma = \frac{F}{A} \] where \( F \) is the force exerted by the person's weight (mass \(\times\) gravity), and \( A \) is the cross-sectional area of the mohair fiber ( \( \pi r^2 \) ). 2. **Determine the number of pieces (n) needed** such that the strain (ɛ) experienced by each is less than 0.010: \[ \epsilon = \frac{\sigma}{E} \] where \( E \) is Young's modulus of mohair. 3. Reorganize the equation and solve for \( n \). **Key Assumptions:** - The tension is equally distributed among all pieces. - Young's modulus of mohair is provided or known from material properties. **Graph and Diagram Description:** - No graphs or diagrams present in this problem statement. This problem involves concepts of material science and strength of materials, particularly understanding mechanical stress, strain, and elasticity.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps with 5 images

Blurred answer
Knowledge Booster
Stress and strain
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
College Physics
College Physics
Physics
ISBN:
9781305952300
Author:
Raymond A. Serway, Chris Vuille
Publisher:
Cengage Learning
University Physics (14th Edition)
University Physics (14th Edition)
Physics
ISBN:
9780133969290
Author:
Hugh D. Young, Roger A. Freedman
Publisher:
PEARSON
Introduction To Quantum Mechanics
Introduction To Quantum Mechanics
Physics
ISBN:
9781107189638
Author:
Griffiths, David J., Schroeter, Darrell F.
Publisher:
Cambridge University Press
Physics for Scientists and Engineers
Physics for Scientists and Engineers
Physics
ISBN:
9781337553278
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:
9780321820464
Author:
Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:
Addison-Wesley
College Physics: A Strategic Approach (4th Editio…
College Physics: A Strategic Approach (4th Editio…
Physics
ISBN:
9780134609034
Author:
Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:
PEARSON