سؤال يحتاج الى حل
 

السلام عليكم .,.,.,. كيف حال اعضاء المنتدى الكرام ...
عندي سوال بس بالانجليزي ( اعذرروني ما قدرت اترجمو )
a person with a remote mountain cabin plans to insall her own hydroelectric plant . A nearby stream is 3 m wide & 0.5m deep . Water flows at 1.2 m\s over the brink of a waterfall 5m high . The manufacturer promises only 25% efficiency in converting the potential energy of the water- earth system into electric energy . find power she can generate. (large -scale hydroelectric plants with a much larger drop are more efficient)