# A 2.65-kg power line running between two towers has a length of 38.0 m and is under a tension of 12.5 N. (a) What is the speed of a transverse pulse set up on the line? (b) If the tension in the line was unknown, describe a procedure a worker on the ground might use to estimate the tension.

### College Physics

11th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305952300

### College Physics

11th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305952300

#### Solutions

Chapter
Section
Chapter 13, Problem 59P
Textbook Problem

## A 2.65-kg power line running between two towers has a length of 38.0 m and is under a tension of 12.5 N. (a) What is the speed of a transverse pulse set up on the line? (b) If the tension in the line was unknown, describe a procedure a worker on the ground might use to estimate the tension.

Expert Solution

(a)

To determine
The speed of the transverse pulses set up on the line.

### Explanation of Solution

Given info: The mass of the power line is 2.65kg . The length of the power line is 38.0m . The tension on the line is 12.5N .

The wave speed in a stretched string is given as,

v=Fμ (I)

• v is the wave speed
• F is the tension in the string
• μ is the mass of the string per unit length or the linear density of the string

The linear density of the string can be defined as,

μ=mL (II)

• μ is the linear density of the string
• m is the mass of the string
• L is the length of the string

Substituting (II) on (I),

v=F

Expert Solution

(b)

To determine
A procedure to estimate the tension on the power line from ground.

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