TPR PHYSICS HELP

[pizza1994]

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Two pulleys--one mounted in the ceiling, another anchored to a mass M suspended above the ground below--have a rope looped over them three complete times, so that there are six strands of rope running between the two pulleys. One end of the rope is tied to the center of the top pulley, the other is being held by a man standing next to the mass. The man pulls down with a tension T on that strand of rope causing the mass to rise at a constant speed. What is the net force pulling up on the bottom pulley?

A) Mg
b)Mg/3
c) Mg/6
d) Mg-T

answer is A)

I would think answer is B because there are three loops of rope....im not even sure now

Can someone help me on this?

 

[JMMTB]

So the ropes and looping are just there is mess you up. Super confusing how they worded it. But that's okay because right at the end it says that the mass moves with constant speed. This means that acceleration=0

The forces acting on the mass are equal. Downward=gravity=mg. Upward (Tension)=mg as well.

 

[pizza1994]

So the ropes and looping are just there is mess you up. Super confusing how they worded it. But that's okay because right at the end it says that the mass moves with constant speed. This means that acceleration=0

The forces acting on the mass are equal. Downward=gravity=mg. Upward (Tension)=mg as well.

right but isnt F(net)= F(T)- mg

and so you are saying that 0= F(T)-mg

tension= mg
???

 

[JMMTB]

Exactly, and the tension is the same throughout the rope.