- #1
Anthonyphy2013
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Homework Statement
The 20cm long wrench swings on its hook with a period of 0.90s. When the wrench hangs from a spring of spring constant 360 N/m , it stretches the spring 3.0 cm. What is the wrench 's moment of inertia about the hook ?
Homework Equations
torque =I alpha , Fsp =kx
The Attempt at a Solution
I put R to be (14+.03)
Homework Statement
The Attempt at a Solution
We need to find I and I = 1/2mg
Consider Fsp = mg when the wrench is at the lowest point .
-kx=mg and m=`kx/g but I dun know how to find the I as the pivot is not on the rotation and should I consider the wrench as a rod for the moment of inertia ?
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