最大爬坡度
参考答案:
指汽车满载、一档,在良好路面上等速行驶时所能爬过的最大坡度。
在半径为R=1.6×106m某星球上,宇航员在离地面5m高处自由释放一个物体,物体落地时速度大小为9m/s.不计空气阻力和星球自转,求:
(1)求该星球表面的重力加加速度;
(2)若宇航员乘坐的宇宙飞船在离该星球表面高度为H=3R处绕该星球做匀速圆周运动,求飞船的速率.
As soon as the _____news came into our ears, we all cheered and became ______. [ ]
A. exciting; exciting
B. excited; excited
C. exciting; excited
D. excited; exciting