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Tension problem :/

by mrrocketknigh
Tags: cosine, physics, sine, tan, tension
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mrrocketknigh
#1
Oct27-10, 06:32 PM
P: 7
Here's the problem: A sledge loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 20.0(degrees) above the horizontal. The sledge moves a distance of 20.0m on a horizontal suface. The coefficient of kinetic friction between the sledge and surface is 0.500. (a) What is the tension of the rope?


I don't know how to even start this problem, or how to find out what the tension is. Can anybody help me?
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution
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tiny-tim
#2
Oct27-10, 06:40 PM
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hi mrrocketknigh! welcome to pf!

if the speed is constant, then the acceleration is zero, so Ftotal = ma tells us that Ftotal = 0

so draw all the forces on the sledge, and get them to add to zero
what do you get?
mrrocketknigh
#3
Oct27-10, 06:52 PM
P: 7
What do you mean by "draw all the forces on the sledge and get them to add to zero"? I'm lost.

mrrocketknigh
#4
Oct27-10, 07:06 PM
P: 7
Tension problem :/

Wait... is it 0??? I tried doing it myself this whole time, but to no avial...
tiny-tim
#5
Oct27-10, 07:14 PM
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Quote Quote by mrrocketknigh View Post
What do you mean by "draw all the forces on the sledge and get them to add to zero"? I'm lost.
draw a diagram of the sledge, then draw all the forces on it
what are they?


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