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<blockquote data-quote="Majere" data-source="post: 1639473" data-attributes="member: 13916">• “Stream” pours out 1 gallon per round.• “Fountain” produces a 5-foot-long stream at 5 gallons per round.• “Geyser” produces a 20-foot-long, 1-foot-wide stream at 30 gallons per round.1) Assume water begins Stationary before &quot;entering&quot; the &quot;pump&quot;Denisty of water (lbs/gallon) = pMass of water pushed back each round : 1p,5p,30pVelocity of water, (Assume a 3&quot;x3&quot; opening): Volume of 1 gallon of water in cu. feet = VTherefore Velocity, 16v,80v,480vMomentum of water:16pV, 400pV, 14400pV&nbsp;This is equal to the momentum given to the raft.&nbsp;The raft has a mass (in lbs)= MTherefore the change in velocity of the raft&nbsp;16pV/M&nbsp;400pv/M&nbsp;14400pV/MThe raft would feel a deceleating for to to viscous drag, and would accelerate until a &quot;terminal velocity&quot;.To work this out would be lending to some wild approximations on the drag of the raft, the time over which the water is accelerate and such.And I dont have time to find p or V <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=";)" title="Wink&nbsp; &nbsp; ;)"&nbsp; data-smilie="2"data-shortname=";)" />Majere</blockquote>

[QUOTE="Majere, post: 1639473, member: 13916"] • “Stream” pours out 1 gallon per round. • “Fountain” produces a 5-foot-long stream at 5 gallons per round. • “Geyser” produces a 20-foot-long, 1-foot-wide stream at 30 gallons per round. 1) Assume water begins Stationary before "entering" the "pump" Denisty of water (lbs/gallon) = p Mass of water pushed back each round : 1p,5p,30p Velocity of water, (Assume a 3"x3" opening): Volume of 1 gallon of water in cu. feet = V Therefore Velocity, 16v,80v,480v Momentum of water: 16pV, 400pV, 14400pV This is equal to the momentum given to the raft. The raft has a mass (in lbs)= M Therefore the change in velocity of the raft 16pV/M 400pv/M 14400pV/M The raft would feel a deceleating for to to viscous drag, and would accelerate until a "terminal velocity". To work this out would be lending to some wild approximations on the drag of the raft, the time over which the water is accelerate and such. And I dont have time to find p or V ;) Majere [/QUOTE]

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