在使用弹簧测力计测量力的过程中,有如下操作: 1轻轻来回拉动两次挂钩; 2把待测在挂钩上; 3观察弹簧测力计的量程,弄清刻度上每一小格表示多少牛; 4调整弹簧测力计指针的位置; 5待指针稳定后读数. 上述操作,正确的顺序是 [ ] A. 12345 B. 23415 C. 41235 D. 34125
【简答题】An ideal gas is flowing in steady state
through a horizontal tube which has nonconducting walls. No heat is
added nor is any shaft work done. The cross-sectional area of the tube
changes with lengt...
【单选题】A string is wound tightly around a fixed pulley having a radius of 5.0 cm. As the string is pulled, the pulley rotates without any slipping of the string. What is the angular speed of the pulley when ...