a load of mass120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms-2]
A
60W
B
80W
C
100W
D
120W
Verified Correct Answer: B.
Physical Principles & Numerical Solution
p = \(\frac{mgh}{t} = \frac{120 \times 10 \times 2}{30} = 80W\)
Source: Myschool Past Questions Archive (Record #34016)