实验次数 | 动滑轮重 | 物重 | 钩码上升高度 | 拉力 | 拉力作用点移动距离 | |
1 | 0.5 | 0.5 | 0.1 | 0.4 | 0.3 | 41.74% |
2 | 0.5 | 1 | 0.1 | 0.7 | 0.3 | 47.6% |
3 | 0.5 | 2 | 0.1 | 1.1 | 0.3 | |
(1)根据表中数据,请在如图中画出宁宁的绕绳方法;(
(2)表格中第三次实验的机械效率
(3)从表中数据分析可知:用同一滑轮组提升重物,当物重增加时,滑轮组机械效率
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