- #1
dennislam
- 5
- 1
Thread moved from the technical forums, so no Homework Help Template is shown
Homework Statement
https://holland.pk/uptow/i4/ae8d3da6c3ce3cad10eb98dd3208a955.png
Homework Equations
τ=I⋅α
The Attempt at a Solution
I want to discuss in part (a) of the question
Tension in 5 kg block string=mg=5*9.8=49N
Taking moment at the pivot, a net torque acting on 15 kg post is 49*(1.75-0.5)=61.25Nm
Torque total=I*α
61.25=((15)(1.75)^2)/3*α
α=4 rad s^-2
But the answer is wrong, I found another solution from other forum
http://physicshelpforum.com/advanced-mechanics/1978-angular-rotation-question.html
I don't know why we need to consider the moment of inertia of the 5 kg block also.
Can anyone help me please! Including a graph for explanation is better if you can
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