- #1
Ogakor
- 17
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Homework Statement
Water is pumped from the ocean to a large reservoir on land. A total lift of 140m. At a rate of 60 cubic meters per hour and eject it with a speed of 65 m/s. If one cubic meter of sea water has a mass of 1,025 kg, find:
a) The work done in lifting the water
b) the work done in ejecting it
c) the total work done
d) the power developed
e) if the pump is 90% efficient, what horse power engine is needed
given:
d = 140m
r (rate) = 60 cubic meters per hour
v = 65 m/s
m = 1,025 kg
for sure, A (work done in lifting the water) can be solved with W (work) = Fd.
Since F is not given, W = (ma)d
since a is not given, a = -v12 / 2d.
my dad said B (work done in ejecting it) can be solved with KE = 1/2mv2. But I am not sure.
Total work can be solved by adding A and B.
I don't know how to solve D and E.
Are my fomulas for A, B and C correct? What formulas should I use for D and E?
Please and Thanx! :)