Posted by **marv** on Thursday, March 29, 2012 at 6:07pm.

a boy weighing 350N runs up a flight of stairs consisting of 20 steps each 10cm high in 10 seconds. What is his power? show your workings

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**Elena**, Thursday, March 29, 2012 at 6:16pm
The height is

h = 20•0.1 = 2 m

The work is W = mgh =350•2 = 700 J

Power = Work/time = 700/10 =70 W

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**yemi**, Tuesday, January 29, 2013 at 5:07am
A 40kilowatt electric cable ??$ used to transmit electricity through a resistor of resistance 2ohms at 800 volts, the power loss at energy is? Pls show workings

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**yemi**, Wednesday, January 30, 2013 at 4:13am
A generator ??$ on daily use in the process 106kw ????? 540w tungsten box are on force the same time interval. Thee energy consumed is

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**Mohammed **, Thursday, October 9, 2014 at 5:05pm
a person with a mass of 40 kg runs up a flight of stairs in 12 seconds the flight has 20 steps and the height of each step is 20cm

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