Put some water in a cylindrical cup with a base circumference of 62.8 cm, and completely immerse a conical plumb weight with a base radius of 5 cm in the water. The water level rises by 0.5 cm, find the height of the plumb bob.
在一个底面周长是62.8cm的圆柱形杯中装一些水，把一个底面半径5cm的圆锥形铅锤完全浸入水中．水面上升0.5cm，求铅锤的高．
<result>60</result>