1.

a water pump takes 20 minutes to pump water to fill a tank of volume 40 metre if the efficiency of pump is 40% and the tank is at the height 15 how electric power is needed for a pump​

Answer»

Explanation:

Here, Volume of water =30 m

3

t=15 min=15×60 s=900 s;HEIGHT,h=40 m

Efficiency, η=30%

Density of water =10

3

kg m

−3

∴ Mass of water pumped =Volume×Density

=(30 m

3

)(10

3

kg m

−3

)=3×10

4

kg

P

output

=

t

W

=

t

mgh

=

900 s

(3×10

4

kg)(10 MS

−2

)(40 m)

=

3

4

×10

4

W

Efficiency, η=

P

INPUT

P

output

P

input

=

η

P

output

=

3×

100

30

4×10

4

=

9

4

×10

5

=44.4×10

3

W=44.4 kW.


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