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is mechanical energy conserved?
no, because chemical energy conversion is not symmetric nor is efficiency close to perfect

efficiency
calories/effort?

3 levers
Class 1  (W)(f)(F), Class 2  (f)(W)(F), Class 3  (f)(F)(W)

Summing moments
always only use the component of the force that effects a rotation

Main electrolytes in body fluid
Na+, Cl, Mg++, Ca++, K+

Coloumb's law
F=kq1q2/d^2


superposition
sum of force vectors

ohm's law
not universal, especially not in living systems

Resistance
(resistivity)(length)/(area)

circuit analysis basic tenants
conservation of charge (currents), conservation of energy (voltages)

Op amp assumptions
input impedance = infinity, output impedance = 0, VpVn = 0

electromechanical analogs
v=iR is equivalent to P=QR

