
(1)实验前要学会正确使用刻度尺和秒表,如图乙所示木块的长度为_____cm.
(2)经测量,AB、BC段长度均为40.0cm,tB=3.0s,tC=5.0s,则小车在BC段的平均速度为_____cm/s.
(3)由以上可知:小车从斜面上A点滑下的过程是做_____直线运动,小车的重力势能_____,动能_____(后两空选填“增大”、“不变”或“减小”).

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

