a wind mill pumps 50kg of water every hour upto a height of 6 m if the efficiency of mill 20% find the power of the mill
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Answered by
17
Work = Force × distance
Force = mass × gravitational acceleration
Force = 50× 10 = 500N
Work = 500 × 6 = 3000 Joules
Power = Work done /Time
Time = 1 × 60 × 60 = 3600s
P = 3000/3600
P = 0.83333
This is power output.
Efficiency = power output /power input × 100%
0.83333/P × 100 = 20
83.333 = 20P
P = 83.333/20
P = 4.16665 Joules per second
This is the power of the mill.
Answered by
4
Power=Energy/Time
=m×g×h/T =50×6×10/3600=5/6
Efficiency =Output/Input
20/100=5/6×1/ Input (P)
power = Input=25/6=4.1666
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