Question 876828
5cm what?  Diameter?
Do you cylindrical rod instead of cylindrical bar?  


Assuming the sheet was melted and recast as some length h and the 5 cm diameter, find the length h using the original volume from the original sheet.


{{{v=0.25*pi(30/2)^2=h*pi(5/2)^2}}}
{{{(1/4)pi*15^2=h*pi(25/4)}}}
{{{pi*15^2=h*pi*25}}}
{{{h*25=15^2}}}
{{{h=(3*5*3*5)/(5*5)}}}
{{{highlight(h=9)}}} cm.