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Q: Physics ( Answered,   0 Comments )
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 Subject: Physics Category: Science > Math Asked by: liskris-ga List Price: \$2.00 Posted: 26 Nov 2005 00:50 PST Expires: 26 Dec 2005 00:50 PST Question ID: 597683
 ```You have probably observed that a steady stream of water flowing out of a faucet gets smaller the farther it gets from the faucet. Why does this happen? Explain in less than 50-words.```
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 Subject: Re: Physics Answered By: juggler-ga on 26 Nov 2005 01:32 PST
 ```Hello. Here's a 50 word explanation: The water from the faucet is falling. As it falls, it speeds up (at least over short distances). If we have a higher velocity at the bottom of the stream, the cross-sectional size of the stream must be smaller in order for the flow rate to remain the same. sources: "The water that emerges from the faucet is falling. What happens to any object that falls under the influence of gravity? It travels faster the further it falls (at least over short distances)... One can understand that if we have a higher velocity at the bottom of the stream, then the cross-section... is going to have to be smaller in order for the flow rate to remain the same. Thus the size of the stream... gets smaller the further (and faster) the water falls. If the stream falls far enough, the water reaches a terminal speed and the size of the stream will stop decreasing in size or becoming smaller as it falls." http://www.uu.edu/programs/physics/sciguysjune2001.htm Also see: " For example, if you've ever noticed water flowing from a faucet set open to give a relatively small flow of water, you might have noticed that the flow narrows as the water falls away from the faucet opening. If we look at the flux of water, defined as the amount or mass of water flowing across an area, A1, per unit of time, then we know that the same mass of water per unit time must flow across A2, placed at a lower position. However, since gravity causes the speed of the water to increase as it falls, the cross-sectional area of the water, that is to say, the size of the stream going through A1 must be larger than the size of the stream going through A2 since the volume of water (and hence the total mass since the water has constant density) per unit time crossing A1 or A2 is given by (cross-sectional area) × (velocity). Hence, since velocity goes up, cross-sectional area must go down. Note that water reaches its terminal velocity quite quickly so that the stream reaches a constant cross-sectional area after just a small distance of travel." http://dept.physics.upenn.edu/courses/gladney/phys151/lectures/lecture_jan_22_2003.shtml ------ search strategy: faucet "stream narrows" "Continuity Equation" faucet I hope this helps.```
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