42. Tension is maintained in a string as in the figure. The observed wave speedis v = 24 m/s when the suspended mass is m = 3 kg. What is the wave speedwhen the suspended mass is m = 1 kg? (Gravitational acceleration g = 10m/s2)
【用戶】面試倒楣鬼-22幸運上後西
【年級】大一下
【評論內容】v = √(T/u) , 此題u不變化, T = mg,v1 = 24 =√(3g/u) , v2 = √(1g/u) = v1/√3 = (E) 13.9 m/s
【用戶】面試倒楣鬼-22幸運上後西
【年級】大一下
【評論內容】v = √(T/u) , 此題u不變化, T = mg,v1 = 24 =√(3g/u) , v2 = √(1g/u) = v1/√3 = (E) 13.9 m/s