/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q4P Question: A column of soldiers, ... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 17: Q4P (page 505)

Question: A column of soldiers, marching at 120paces per minute, keep in step with the beat of drummer at the head of the column. The soldiers in the rear end of the column are striding forward with the left foot when the drummer is advancing with the right foot. What is the approximate length of the column?

Short Answer

Expert verified

Answer

The length of the column is 1.7脳102m.

Step by step solution

01

Given data

A column of soldiers marching at 120 pacesper minute

02

Determining the concept 

First, calculate the time tin seconds, and then, by using the speed vof sound, find the approximate length lof the column.

The expression for the length of the column is given by,

l = v t

Here, l is thelength of the column, t is time and v is velocity.

03

Determining the approximate length of the column

The time it takes for a soldier in the rear end of the column to switch from the left to the right foot to stride forward is,

t=1120min脳60=0.50s

This is also the time for the sound of the music to reach from the musician to the rear end of the column. Thus, the length of the column is given by,

I = vt

Substitute for and for into the above equation,

l=343脳0.50=1.7脳102m

Hence, the length of the column is 1.7脳102m.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Question: A man strike one end of a thin rod with a hammer. The speed of sound in the rod is 15times the speed of sound in the air. A woman, at the other end with her ear close to the rod, hears the sound of the blow twice with a 0.12 sinterval between; one sound comes through the rod and the other comes through the air alongside the rod. If the speed of sound in air is 343 m/swhat is the length of the rod?

Question: Figure 17-28 shows a moving sound source S that emits at a certain

frequency, and four stationary sound detectors. Rank the detectors

according to the frequency of the sound they detect from the

source, greatest first.

Brake or turn? Figure 6- 44 depicts an overhead view of a car鈥檚 path as the car travels toward a wall. Assume that the driver begins to brake the car when the distance to the wall is d = 107 m, and take the car鈥檚 mass as m = 1400kg, its initial speed as v0 = 35m/s, and the coefficient of static friction as 渭s=0.50. Assume that the car鈥檚 weight is distributed evenly on the four wheels, even during braking.

(a) What magnitude of static friction is needed (between tires and road) to stop the car just as it reaches the wall?

(b) What is the maximum possible static friction fs,max?

(c) If the coefficient of kinetic friction between the (sliding) tires and the road is渭k=0.40, at what speed will the car hit the wall? To avoid the crash, a driver could Select to turn the car so that it just barely misses the wall, as shown in the figure.

(d) What magnitude of frictional force would be required to keep the car in a circular path of radius dand at the given speed v0, so that the car moves in a quarter circle and then parallel to the wall?

(e) Is the required force less than fs.maxso that a circular path is possible?

A violin string 15.0鈥塩尘long and fixed at both ends oscillates in its n=1mode. The speed of waves on the string is 250鈥尘/蝉, and the speed of sound in air is 348鈥尘/蝉.

What are the (a) frequency and (b) wavelength of the emitted sound wave?

A state trooper chases a speeder along a straight road; both vehicles move at 160km/h. The siren on the trooper鈥檚 vehicle produces sound at a frequency of 500Hz. What is the Doppler shift in the frequency heard by the speeder?
See all solutions

Recommended explanations on Physics Textbooks

Fluids

Read Explanation

Physical Quantities And Units

Read Explanation

Classical Mechanics

Read Explanation

Modern Physics

Read Explanation

Oscillations

Read Explanation

Geometrical and Physical Optics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.