Shot put: A shot - put is a

A shot - put is a metallic sphere of radius 4.9 cm. If the density of the metal is 7.8 g per cm 3, find the mass of the shot - put . (Take π=22/7) 常见50种运动英文如下： race 跑 middle-distance race 中长跑 sprint 短跑 (美作:dash) the 400 metre hurdles 400米栏 marathon 马拉松 decathlon 十项 cross-country race 越野跑 walk 竞走 jump 跳跃 high jump 跳高long jump 跳远 (美作:broad jump) triple jump, hop step and jump 三级跳 pole vault 撑竿跳 throw 投掷 putting the shot, shot put 推铅球 throwing the discus 掷铁饼 throwing the hammer 掷链锤 throwing the javelin 掷标枪 gymnastics 体操 ... 综述： 跳高：high jump、 跳远：long jump、三级跳远：three step jump、 撑竿跳高：pole vaul、铅球：shot-put、铁饼：discus-throwing、标枪：javelin throwing、链球：hammer-throwing。 例句： 1、速度是所有 田径运动 项目的关键要素。 Speed is the essential ingredient of all athletics. 2、田径运动的项目很多，例如跳高、跳远、 百米赛跑 等。 There are many track-and-field events, such as the high jump, the long jump ... The diameter of the iron ball used for the shot - put game is 14 cm . It is melted and then a solid cylinder of height 21 3 cm is made . what will be the diameter of the base of the cylinder ?