某一瞬时,平面图形上点 A 的速度 v A ≠0 ,加速度 a A =0 , B 点的加速度大小 a B =40cm/s 2 , 与 AB 连线的夹角 φ =60° ,如图示,若 AB=5cm ,则该瞬时,平面图形的角速度大小为 ω = ( __ ) rad/s ,角加速度 α = ( __ ) rad/s 2 ,转向为( __ )时针方向。
【简答题】听下面一段材料,回答第1-4题。 1. What do we know about Clifford’s last picnic ? A. He was wet all over because of the rain . B. He had a good time with his friends . C. He stayed home in case it would rain . 2. Wh...