WAEC - Physics (2002 - No. 15)
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]
60W
80W
100W
120W
解释
p = \(\frac{mgh}{t} = \frac{120 \times 10 \times 2}{30} = 80W\)