An electric water pump rate 1.5 kW, lifts 200kg of water through a vertical height of 6 meters in 10 seconds. What is the efficiency of the pump? [g = 10ms-2, neglecting air resistance]
A
90.0%
B
85.0%
C
80.0%
D
65.0%
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Efficiency = output x 100
= \(\frac{\frac{200 {\times} 10 {\times} {6}}{10}}{1500}\) x \(\frac{100}{1}\)
= 80%
Source: Myschool Past Questions Archive (Record #27686)