【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 ...