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I have an example which I am not certain about: enter image description here

So It consists of a friction wheel, whose power $P_{fw}$ we know. The power is used to power the driven machine $Dm$ on a shaft that lies on 2 bearings, $A$ and $B$. That shaft is connected to a spindle via the clutch $Cl$. The spindle lies on 2 bearings $C$ and $D$ and is used to move $m$

the bearings, the clutch and the spindle all have their coefficients of efficiency: $\eta_{A}, \eta_{B}, \eta_{Cl}, \eta_{C}, \eta_{D}, \eta_{sp}$

I want to know the power on the driven machine DM. My question is which of these coefficients do I take into account? I'm pretty sure I need $\eta_{A}$ and $\eta_{B}$, but I don't know abut the others.

So my solution would be $P_{dm}=P_{fw}*\eta_{A}*\eta_{A}$ but I am not certain about it. Please explain if this is correct and why/why not.

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