JAMB - Physics (2009 - No. 5)
If a cage containing a truck of coal weighing 750 kg is raised to a height of 90 m in a minute, what is the total power expended?
[g = 10 ms2]
[g = 10 ms2]
11.50 kw
12.60 kw
11.25 kw
12.10 kw
Explanation
Power = \(\frac{work done}{time taken}\)
where 1 min = 60s
= \(\frac{mgh}{t}\)
= \(\frac{750 \times 10 \times 90}{60}\)
= 11250w or 11.25kw
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