cylindrical container with a bottom radius of 5 cm is filled with water. A cylindrical iron block with a bottom radius of 4 cm is completely submerged in water. The water level rises by 1 cm. What is the height of the iron block?
一个底面半径是5厘米的圆柱形容器里装着水，现把一个底面半径是4厘米的圆柱形铁块完全浸没在水中，水面升高了1厘米，求这个铁块的高是多少？
<result>1.5625</result>