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  1. ...5*14-(1/2)*( 5/14)*142 =35(rev) So, the tub turns 30+35=65(rev) during the 26s interval . 2. ω=75 rev/min=1.25 rev/s ω=ω0+αt 1.25=0+α*5 &alpha...

  2. ...其到達時間,假設為t2,那麼閃電距離我們的路程S=331*(t2-t1). A: The speed of light is 300000000m/s which is extremely fast, so that we can ignore...