《压强和浮力》单元测试题四(参考答案)
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《压强和浮力》单元测试题四(参考答案)DIV.MyFav_1324344793208
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一、选择题
1.A 2.B 3.D 4.C 5.C 6.C 7.B 8.D 9.A 10.B 11.B 12.C 13.B 14.C 15.D 16.D 17.C 18.C 19.C 20.A 21.C
二、填空题
22.不变,不变;23.空心的,轮船;24.等于;25.相等,相等;26.甲,丙,相等,相等;27.变大,变小;28.12.5 ;29.减小压力,增加受力面积;30.8.76×107牛;31.1.5×103立方分米,0.67×103Kg/m3;32.压力,每平方米面积上受到的压力是20牛;33.更大,减小;34.压强。
三、实验题
35.(1)在量筒中放入适量的水,读出体积V1;(2)用细线拴住油泥,浸没在量桶中,读出体积V2;(3)再把油泥做成空心,使其漂浮在水面上,读出体积V3;(4)根据G=F 浮=ρ水g(V3-V1),算出油泥的重力;(5)根据V= V2-V1