搜题

初三物理浮力的两题1.由于海水密度大于河水,轮船从内河进入大海船体会浮起一些,轮船受到的浮力(变大,变小or不变)2.把体积为4立方分米,浮力是39.2N的铜块浸没在酒精中,铜块受到

物理答案 2023-04-27

问题描述:

初三物理浮力的两题
1.由于海水密度大于河水,轮船从内河进入大海船体会浮起一些,轮船受到的浮力 (变大,变小or不变)
2.把体积为4立方分米,浮力是39.2N的铜块浸没在酒精中,铜块受到的浮力将 (变大,变小or不变)
第一题是不变,第二题是变小.为什么?


最佳答案:

“尊VS薇”:您好.(一)不变.因为浮力等于物体排开同体积液体的重量,轮船进入大海,船体浮起了一些,排开海水的体积小了,但海水的比重大了,所以浮力还是不变.(二)变小,因为铜块是全部浸没在液体中的,排开水的体积和...

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