(1)为了测量滑动摩擦力大小,可将木块置于水平桌面上,用弹簧测力计沿水平方向拉动,使其做
(2)用甲、乙、丙图所示方法,测量了三次滑动摩擦力大小,图中弹簧测力计示数分别为、、
①根据甲丙图中
②图丁中,自行车选用橡胶做刹车皮,这用到了
③三次实验中,木块的速度大小,不能是
A. B. C. D.
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