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anonymous

  • one year ago

What power of an engine is required to pump 2450 N of water per second from a well 50 m deep to the surface? (a) 2.45*10^3 watts (b) 2.45*10^4 watts (c) 2.45*10^5 watts (d) none of these

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  1. anonymous
    • one year ago
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    @Michele_Laino please can you solve it?

  2. anonymous
    • one year ago
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    okay so work is Fd so the answer is 2450 N times 50 m

  3. anonymous
    • one year ago
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    wait... per second

  4. anonymous
    • one year ago
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    ignore my last answer

  5. anonymous
    • one year ago
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    I think you're right because a watt is a N-m/s, so the units work out

  6. Michele_Laino
    • one year ago
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    we have to consider the manometric head H, which is about 50 m, so the requested power P is: \[\Large P = F\left( {H + h} \right) = 2450\left( {50 + 50} \right) = ...?\] being h the deepness of the well

  7. Michele_Laino
    • one year ago
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    sorry H is equal to the ratio between the pressure difference and the specific weight of the water and H+h is the manometric head or manometric prevalence

  8. anonymous
    • one year ago
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    would you please tell me a little about manometric head,50 m deepness is okay to understand but what about additional 50m that you added

  9. Michele_Laino
    • one year ago
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    since the formula for computing the power, is: \[\large P = \frac{{FH}}{t}\] where H is the total prevalence, whose formula is: \[H = h + \frac{{\Delta p}}{\gamma }\] \Delta p is the difference between the pressures

  10. Michele_Laino
    • one year ago
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    |dw:1434218860993:dw|

  11. Michele_Laino
    • one year ago
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    |dw:1434218975568:dw|

  12. Michele_Laino
    • one year ago
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    so: \[\frac{{\Delta p}}{\gamma } = 5 \times 10.33 = 51.65\;meters\]

  13. Michele_Laino
    • one year ago
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    please keep in mind that 10.33 meters is the maximum aspiration height for a pump

  14. Michele_Laino
    • one year ago
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    and: 1 athmosphere is equivalent to 10.33 meters of water

  15. anonymous
    • one year ago
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    so you think that 2.45*10^5 would be the correct option?

  16. Michele_Laino
    • one year ago
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    yes!

  17. anonymous
    • one year ago
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    are you confirmed liano?

  18. IrishBoy123
    • one year ago
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    . i'd go with d) but i'd like the OP to post the answer when that becomes apparent

  19. Michele_Laino
    • one year ago
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    yes! I confirm my answer above!

  20. anonymous
    • one year ago
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    i asked this to my friend he say to me that you can apply formula \[P=mgh/t\] since W=mgh \[P=W/t\]

  21. anonymous
    • one year ago
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    so after this answer is none of these,the (d) option

  22. anonymous
    • one year ago
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    i am so much confused about the answer,but i think what you are telling is also correct!

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