(1)求C的质量mc;
(2)求开始时A受到的摩擦力大小;
(3)若向C中缓慢加入沙子,当B刚要向上运动时,加入沙子的总质量记为m1,继续缓慢加入沙子,B缓慢向上运动,当A刚要向上运动时(C未触地,弹簧处于弹性限度范围内),加入沙子的总质量记为m2,求:
①
②A刚要向上运动时,B已经向上运动的距离。
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