Andy (mass 80 kg) uses a 3.0-m-long rope to pull Bob (mass 60 kg) across the floor ( mue=0.20 ) 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 150 ms later. What is the mass of the rope?
2007-11-11 06:16:44 · 2 answers · asked by rochesmk 2 in Science & Mathematics ➔ Physics
Taut line theory (see ref.):
v = sqrt(T/(m/L))
v^2 = T/(m/L) = LT/m
m = LT/v^2
where v = 3/0.15, L = 3, T = mu*mg, m=60
Note Andy's mass and speed of pulling are irrelevant.
2007-11-11 10:12:23 · answer #1 · answered by kirchwey 7 · 0⤊ 0⤋
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What is the mass of the rope?
Andy (mass 80 kg) uses a 3.0-m-long rope to pull Bob (mass 60 kg) across the floor ( mue=0.20 ) 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 150 ms later. What is the mass of the...
2015-08-13 02:01:51 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Andy Mass
2016-11-01 08:40:36 · answer #3 · answered by tieman 4 · 0⤊ 0⤋
you might want to get that checked out by a doctor
2016-03-16 23:55:46 · answer #4 · answered by Anonymous · 0⤊ 0⤋