净重2.5克,直径2.5厘米的圆形球体,它的密度是多少?
净重2.5克,直径2.5厘米的圆形球体,它的密度是多少?
数学人气:461 ℃时间:2020-02-06 10:47:10
优质解答
球体的体积等于三分之四乘以π乘以半径的三次方.直径2.5厘米的圆形球体的体积是 4/3 * 3.14 * 1.25 * 1.25 * 1.25 = 8.177(立方厘米) 球体的密度是 2.5 / 8.177 = 0.3057(克/立方厘米)
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