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下次自动登录物体的浮沉条件:浸没液体中的物体,如果浮力大于重力,物体上浮;如果浮力小于重力,物体下沉;如果浮力等于重力,物体悬浮,据此回答.
解:将种子放入盐水中后,由于干瘪,虫蛀的种子重量较小,故受到的浮力大于重力而使种子上浮,直至浮力等于重力时漂浮于水面上;而饱满的种子,本身重量较大,故重力大于所受浮力,故种子会下沉.但如果盐水的浓度太低,因为种子排开盐水的体积不变,所以种子受到盐水的浮力减小,所以只有少量次种漂浮,当种子受到的浮力大于种子重力时,就可以浮起来.故选.
本题考查物理知识在生产生活中的应用,由浮沉条件可知浸没水中的物体若浮力大于重力,则物体会上浮;若浮力小于重力物体会下沉.故我们可以利用浮沉的条件将可用的种子选出.
2901@@3@@@@物体的浮沉条件及其应用@@@@@@193@@Physics@@Junior@@$193@@2@@@@压强和浮力@@@@@@37@@Physics@@Junior@@$37@@1@@@@运动和相互作用@@@@@@5@@Physics@@Junior@@$5@@0@@@@初中物理@@@@@@-1@@Physics@@Junior@@
第一大题，第5小题
求解答 学习搜索引擎 | 选择优良种子,是农业丰收的基本保证,盐水选种是我国农民常采用的选种方法:将待选的种子放入浓度适当的盐水中后,良种沉入水底,次种则漂浮于水面,很快就能完成选种工作,如图所示.但盐水浓度的把握是关键,如果盐水的浓度太低,则可能(
)A、所有种子都漂浮在水面B、所有种子都不受浮力C、只有少量次种漂浮D、良种漂浮,而次种下沉lanluntongshi_日本
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