(1)为了保证电路正常工作,选择 R1时,最大阻值不应超过
(2)如要求电要指针偏转的幅度随水位的上升而增大,则选用电路中
(3)选择R1是长10cm、总阻值为20Ω的电阻丝,圆柱体M高100cm,底面积为100cm2, 当M刚好浸没在水中时,滑片P恰好在R1的最上端。当水位下降,电压表示数为9V时,此时水位比最高处时下降了多少?
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