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Statics problem

by Jstew
Tags: statics
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Jstew
#1
Nov14-08, 12:10 AM
P: 19
1. The problem statement, all variables and given/known data
Using a uniform strut, a rigid brace hinged at the floor, a
person holds a 30-kg engine in equilibrium while it is being
repaired. The strut has a mass of 12.5 kg. A smooth rope passes
over a pulley at the end of the strut. (a) What is
the force exerted on the rope by the person? (Specify the direction
of this force by calculating the angle theta that the rope
makes with the horizontal.) (b)What forces are exerted by the
strut?




2. Relevant equations
Fx=0
Fy=0
T=rF=0
3. The attempt at a solution
Looking at the engine, Fy=0 so Tension=mg. I don't know where to go from here.
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tiny-tim
#2
Nov14-08, 03:01 PM
Sci Advisor
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tiny-tim's Avatar
P: 26,148
Hi Jstew!
Quote Quote by Jstew View Post
Looking at the engine, Fy=0 so Tension=mg.
Well, that's the answer to (a), isn't it?

For (b), start by taking moments about the hinge.


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