(1)闭合开关后,不拉拉环时,电流表的读数为多少A?
(2)茂茂测拉力时,电流表的读数为0.3A,茂茂的拉力为多少N?
(3)当拉力最大为600N时,电流表的指针能刚好指到最大刻度处吗?若能说明理由,若不能请写出拉力最大时电流表指针刚好能指到最大刻度处的方法(写出一种方法即可)。
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