http://img.en.china.cn/0/0,0,487,17100,444,360,eab251b5.jpg a[/URL] hollow cylinder of inner diameter 3.6 m , it's wall thickness is 3 cm , made of stainless steel of rel. density 7.7 , the cylinder's length is 7.2 m , find the power required (during continuous operation) to rotate the cylinder...