Question

A stream of water flowing from a tap becomes namower as it falls, this can be cxplained by (a) viscosity (b) surface tension (c) conservation of encrgy (d) conscrvation of volume llux

   A stream of water flowing from a tap becomes namower as it falls, this can be cxplained by
(a) viscosity
(b) surface tension
(c) conservation of encrgy
(d) conscrvation of volume llux

Practice Problem in Physics for the JEE Main and Advanced

Abhay Kumar 2015 Edition

Chapter 9, Problem 92

Instant Answer

Solved by Expert Narayan Hari

01/24/2022

Step 1

According to this principle, the total energy in a closed system remains constant. In this case, the system is the stream of water. As the water falls, its potential energy is converted into kinetic energy, causing it to move faster and thus become narrower. Show more…

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A stream of water flowing from a tap becomes namower as it falls, this can be cxplained by (a) viscosity (b) surface tension (c) conservation of encrgy (d) conscrvation of volume llux

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Key Concepts

Conservation of Energy

This concept explains that as water falls under gravity, its potential energy is converted into kinetic energy, thereby increasing its speed. As the velocity increases, the energy balance of the system is maintained through energy transformation, which is a fundamental aspect of how gravitational forces act on moving fluids.

Conservation of Volume Flux

Also known as the continuity equation in fluid mechanics, this principle states that the volume of fluid passing through any cross-section of a stream per unit time remains constant. As the falling water accelerates and its speed increases, the cross-sectional area must reduce to ensure that the same amount of water flows through each section, resulting in a narrower stream.

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