(1)实验前,将杠杆置于支架上,当杠杆静止时,发现左端下沉,如图1所示,此时,应把杠杆的平衡螺母向
(2)调节平衡后,在杠杆上A点处挂两个钩码,如图2所示,则在B点处应挂
(3)为了使实验结论具有
(4)实验时,不再调节平衡螺母,使杠杆的重心位置保持在O点不变,将支点换到点,如图3所示,发现A点处只挂1个钩码,杠杆仍然保持平衡。若每个钩码重为0.5N,则杠杆重力为
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