(1)小明用所学知识初步判断麻油密度的大小,他向水中滴入几滴麻油,麻油能从倾斜的瓶口下落,这是由于麻油受到
(2)为了测出麻油的密度,小明进行如下操作:
①把托盘天平放在水平桌面上,先将
②用托盘天平测得空烧杯的质量m0=20g;
③在烧杯中倒入适量麻油,置于托盘天平左盘,天平横梁平衡后如图甲所示,则烧杯和麻油的总质量m=
④将烧杯中麻油倒入量筒中,如图乙所示;
⑤算出麻油的密度ρ=
(3)小华认为:小明操作步骤不合理,测得的麻油密度偏
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2