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18-04-2016
Physics

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The power expended when a 10 N barbell is raised 2. 0 m in 2s is

Respuesta :

18-04-2016

Work done = (force) x (distance)
   = (10 N) x (2 m) = 20 joules .

Power = (work done) / (time to do the work)
   =       (20 J) / (2 sec)
   = 10 joules/sec = 10 watts .

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