Travelling waves

2006-11-23 5:32 pm

Andy (mass 80kg) uses a 3.0 m long rope to pull Bob (60kg) across the floor(coefficient of friction=0.2) at a constant speed of 1.0m/s.Bob signals to andy to stop by plucking the rope, sending a wave pulse forward along the rope. The pulse reaches Andy 150ms later. What is the mass of rope?

回答 (1)

manuel

2006-11-24 6:40 am

✔ 最佳答案

because uniform speed

T=μR
=(0.2)(600)
= 120N

v=√(T/μ) μ= mass per unit length
3/(150*10^-3)=√(120*3/m)
m=0.9 kg

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