机械波的计算题 A pulse of width 32.6 cm bouncing back and forth on a stretched string oflength 25.7m and mass per unit length μ = 1.65 × 10−3 kg/m is observed totake 12.8 s to make 13 round trips.What is the tension on the string?
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![机械波的计算题 A pulse of width 32.6 cm bouncing back and forth on a stretched string oflength 25.7m and mass per unit length μ = 1.65 × 10−3 kg/m is observed totake 12.8 s to make 13 round trips.What is the tension on the string?](/uploads/image/z/9993166-70-6.jpg?t=%E6%9C%BA%E6%A2%B0%E6%B3%A2%E7%9A%84%E8%AE%A1%E7%AE%97%E9%A2%98+A+pulse+of+width+32.6+cm+bouncing+back+and+forth+on+a+stretched+string+oflength+25.7m+and+mass+per+unit+length+%CE%BC+%3D+1.65+%C3%97+10%26%238722%3B3+kg%2Fm+is+observed+totake+12.8+s+to+make+13+round+trips.What+is+the+tension+on+the+string%3F)
机械波的计算题 A pulse of width 32.6 cm bouncing back and forth on a stretched string oflength 25.7m and mass per unit length μ = 1.65 × 10−3 kg/m is observed totake 12.8 s to make 13 round trips.What is the tension on the string?
机械波的计算题
A pulse of width 32.6 cm bouncing back and forth on a stretched string of
length 25.7m and mass per unit length μ = 1.65 × 10−3 kg/m is observed to
take 12.8 s to make 13 round trips.What is the tension on the string?
机械波的计算题 A pulse of width 32.6 cm bouncing back and forth on a stretched string oflength 25.7m and mass per unit length μ = 1.65 × 10−3 kg/m is observed totake 12.8 s to make 13 round trips.What is the tension on the string?
并不是很确定脉冲的宽度的影响,但是弦线的两端是固定的,脉冲的宽度并不会增加波走过的距离.
走过的距离为13*2*25.7=668.2(m),时间为12.8(s)由此得到波速v=52.2 m/s.
再由弦线上的波速公式v=√(T/μ),此处μ为弦线的线质量密度.
T=v^2 *μ=(52.2)^2 *1.65×10-3=4.5(N)