Very easy Work Energy question help please?! :)
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Very easy Work Energy question help please?! :)

[From: ] [author: ] [Date: 11-08-19] [Hit: ]
8*10/60 = 49W = 0.066hp.......
A pump lifts water from a level of 10m below the ground. Water is pumped at a rate of 30kg/minute with negligible velocity. Calculate the minimum horsepower the engine must have to do this.


Please help me with this question :)

-
Work = mgh = 30(9.8)(10) = 2940 J

P = Work / time = 2940 / (60 s) = 49 W

In HP = 49 / 746 = 0.0657 hp

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The pump needs to lift m = 30kg of water a height of h = 10m in 1 min. = 60s. So the power required is

mgh/60 = 30*9.8*10/60 = 49W = 0.066hp.
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