/*! 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} Q107PP Archerfish are tropical fish tha... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 1: Q107PP (page 271)

Archerfish are tropical fish that hunt by shooting drops of water from their mouths at insects above the water鈥檚 surface to knock them into the water, where the fish can eat them. A 65-g fish at rest just at the surface of the water can expel a 0.30-g drop of water in a short burst of 5.0 ms. High-speed measurements show that the water has a speed of 2.5 m/s just after the archerfish expels it.

What is the speed of the archerfish immediately after it expels the drop of water? (a) 0.0025 m/s; (b) 0.012 m/s; (c) 0.75 m/s; (d) 2.5 m/s.

Short Answer

Expert verified

The correct answer is (b) 0.012鈥�m/s.

Step by step solution

01

Identification of given data

The velocity of water is vw=2.5鈥�m/s.

The mass of water is mw=0.3脳10-3鈥�kg.

The mass of fish is mfish=65脳10-3kg.

The velocity of insect is vi=2鈥�m/s.

The time is t=5脳10-3鈥�s.

The momentum of the fish is the same for the drop of water ispwater=7.5脳10-4kg鈰�m/s

02

Concept/Significance of change in Conservation of Momentum

The final total momentum is zero, so apply the law of conservation of momentum

m1v1-m2v2=0m1v1=m2v2

The expression to calculate the required velocity is given by,

pwater=mfishvfish鈥�鈥�鈥�鈥�鈥�鈥�鈥�......(1)

03

Determine the speed of the archerfish immediately after it expels the drop of water

Substitute mfish=65脳10-3kg, andpwater=7.5脳10-4kg鈰�m/s in the equation (1) to find the speed of the archerfish.

7.5脳10-4kg.m/s=vfish65脳10-3kgvfish=7.5脳10-4kg.m/s65脳10-3kg=0.012m/s

Therefore, the correct answer is (b) 0.012 m/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.

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

How many gallons of gasoline are used in the United States in one day? Assume that there are two cars for every three people, that each car is driven an average of 10,000 miles per year, and that the average car gets 20 miles per gallon.

A medical technician is trying to determine what percentage of a patient鈥檚 artery is blocked by plaque. To do this, she measures the blood pressure just before the region of blockage and finds that it is 1.20脳104Pa, while in the region of blockage it is role="math" localid="1668168100834" 1.15脳104Pa. Furthermore, she knows that blood flowing through the normal artery just before the point of blockage is traveling at 30.0 cm/s, and the specific gravity of this patient鈥檚 blood is 1.06. What percentage of the cross-sectional area of the patient鈥檚 artery is blocked by the plaque?

If C鈫�=A鈫�+B鈫� ,what must be true about the directions and magnitudes of A鈫� and B鈫�ifC=A+B ? What must be true about the directions and magnitudes of role="math" localid="1647990633202" A鈫�andB鈫� ifC=0 ?

Calculate the earth鈥檚 gravity force on a 75-kg astronaut who is repairing the Hubble Space Telescope 600 km above the earth鈥檚 surface, and then compare this value with his weight at the earth鈥檚 surface. In view of your result, explain why it is said that astronauts are weightless when they orbit the earth in a satellite such as a space shuttle. Is it because the gravitational pull of the earth is negligibly small?

An 8.00鈥�kg point mass and a12.00鈥�kg point mass are held50.0鈥�cm apart. A particle of mass mis released from a point between the two masses20.0鈥�cm from the8.00鈭�kg group along the line connecting the two fixed masses. Find the magnitude and direction of the acceleration of the particle.
See all solutions

Recommended explanations on Physics Textbooks

Magnetism

Read Explanation

Engineering Physics

Read Explanation

Electricity and Magnetism

Read Explanation

Conservation of Energy and Momentum

Read Explanation

Thermodynamics

Read Explanation

Modern Physics

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.