heyyalliee
Oct 4, 2010, 09:42 AM
Mechanical Advantage-
The pulley system shown in the figure is used to lift a 52- crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume the masses of the chains, pulleys, and ropes are negligible.
Q1: Determine the force required to lift the crate with constant speed.
Q2:Determine the tension in the upper chain.
Q3: Determine the tension in lower chain.
Okay so to find Force I did:
Fnet=F+F-mg
F=Mg/2
52(9.81)/2 =255.06 or 260( they want it in 2 sig figs)
When I checked answer it said this was not right?!
What am I doing wrong.
I know top and bottom tension should equal. I'm just having a hard time finding F.
Thanks for help
The pulley system shown in the figure is used to lift a 52- crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume the masses of the chains, pulleys, and ropes are negligible.
Q1: Determine the force required to lift the crate with constant speed.
Q2:Determine the tension in the upper chain.
Q3: Determine the tension in lower chain.
Okay so to find Force I did:
Fnet=F+F-mg
F=Mg/2
52(9.81)/2 =255.06 or 260( they want it in 2 sig figs)
When I checked answer it said this was not right?!
What am I doing wrong.
I know top and bottom tension should equal. I'm just having a hard time finding F.
Thanks for help