A.若将平抛初速度减小一半,则小球将落在AB两点的中点 |
B.平抛初速度不同,小球落到斜面上时的速度方向与斜面间的夹角不同 |
C.平抛初速度不同,小球落到斜面上时的速度方向与斜面间夹角正切值一定相同,等于2tan30° |
D.若平抛小球的初动能为6J,则落到斜面上时的动能为14J |
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