A.手提水桶时手上出现压痕,是由于水桶所受的重力作用在手上 |
B.用3N的力拉着木块在水平桌面上做匀速直线运动,木块受到的摩擦力等于3N |
C.用大小不变的力F竖直拉起静止在水平桌面上质量为m的钩码,F一定大于mg |
D.跳水运动员起跳时,跳板向下弯,人对跳板的作用力与跳板对人的作用力大小相等 |

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

