Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 1: Q78P (page 64)

A physics teacher performing an outdoor demonstration suddenly falls from rest off a high cliff and simultaneously shouts “Help.” When she has fallen for 3.0 s, she hears the echo of her shout from the valley floor below. The speed of sound is 340 m/s. (a) how tall is the cliff? (b) If we ignore air resistance, how fast will she be moving just before she hits the ground?

Short Answer

Expert verified

a) Height of the cliff is 532 m.

b) Speed is 14.7 m/s .

Step by step solution

01

Identification of given data

Fallen time (t) = 3.0 s

Speed (v) = 340 m/s

02

Calculation for the height

As we know that

d=vtd=340×3d=1020m

Now in the same time teacher will fall down that distance,

d1=12gt2d1=12×9.81×9d1=44.1m

Now total distance travelled by teacher and sound

dt=d1+ddt=1020+44.1dt=1061.1m

This distance will be equal to twice of the height of cliff

2H=1064.1h=532m

03

Calculation for the speed

d1=vt44.1=v×3v=14.7m/s

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.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

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

The density of gold is 19.3 g/cm3 . What is this value in kilograms per cubic meter?

How many years older will you be 1.00 gigasecond from now? (Assume a 365-day year.)

Air traffic controllers give instructions called “vectors” to tell airline pilots in which direction they are to fly. If these are the only instructions given, is the name “vector” used correctly? Why or why not?

Equation (12.7) shows that an area ratio of 100 to 1 can give 100

times more output force than input force. Doesn’t this violate conservation

ofenergy? Explain.

Can you find two vectors with different lengths that have a vector sum of zero? What length restrictions are required for three vectors to have a vector sum of zero? Explain.
See all solutions

Recommended explanations on Physics Textbooks

Further Mechanics and Thermal Physics

Read Explanation

Fields in Physics

Read Explanation

Classical Mechanics

Read Explanation

Radiation

Read Explanation

Circular Motion and Gravitation

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.

Sign-up for free