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Unreasonable ResultsSquids have been reported to jump from

College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs ISBN: 9781938168000 42

Solution for problem 62PE Chapter 8

College Physics | 1st Edition

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College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs

College Physics | 1st Edition

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Problem 62PE

 Problem 62PE

Unreasonable Results

Squids have been reported to jump from the ocean and travel 30.0 m (measured horizontally) before re-entering the water. (a) Calculate the initial speed of the squid if it leaves the water at an angle of 20.0º , assuming negligible lift from the air and negligible air resistance. (b) The squid propels itself by squirting water. What fraction of its mass would it have to eject in order to achieve the speed found in the previous part? The water is ejected at 12.0 m/s ; gravitational force and friction are neglected. (c) What is unreasonable about the results? (d) Which premise is unreasonable, or which premises are inconsistent?

Step-by-Step Solution:

 Solution  62 PE

a.)

Step 1 of 4

The initial speed of the squid can be calculated by using an  expression for the range of a  projectile which relates the initial speed with the range (horizontal distance ) .

Where, R = Range of the projectile in m = 30.0 m

             vo= initial speed in m/s

            g = acceleration due to gravity = 9.8 m/s2

           = angle of projection = 20.0o 

Solving forgives,

 

Substituting  9.8 m/s2 for g, 30.0 m for R and 20.0o for

     =

     =

     =

 =  21.39 m/s

Therefore, the initial speed of the squid if it leaves the water at angle of 20o is 21.39 m/s.



b.)

Step 2 of 4

Chapter 8, Problem 62PE is Solved
Step 3 of 4

Textbook: College Physics
Edition: 1
Author: Paul Peter Urone, Roger Hinrichs
ISBN: 9781938168000

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Unreasonable ResultsSquids have been reported to jump from