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【简答题】
You should spend no more than 20 minutes on this task. You travelled by plane last week and your suitcase was lost. You have still heard nothing from the airline company. Write to the airline and explain what happened. Describe your suitcase and tell them what was in it. Find out what they are going to do about it. You should write at least 150 words. You do NOT need to write your own address. Begin your letter as follows: Dear______,
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【单选题】一飞轮对轴的转动惯量为 J ,以角速度 w 0 绕轴旋转,另一静止飞轮突然被啮合到同一轴上,该飞轮对轴的转动惯量为前者的 3 倍.则啮合后整个系统的角速度为
A.
w 0 /4
B.
w 0 /3
C.
w 0 /2
D.
w 0
【简答题】疏松木材、纺织品等易燃物与高温管道接触后，会因为温度升高其燃点而导致燃烧。()
【单选题】一飞轮以角速度 w 0 绕光滑固定轴旋转,飞轮对轴的转动惯量为J 1 ;另一静止飞轮突然和上述转动的飞轮啮合,绕同一转轴转动,该飞轮对轴的转动惯量为前者的二倍.啮合后整个系统的角速度 w
A.
w 0 /3
B.
3 w 0
C.
w 0 /2
D.
2 w 0