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We have these two equations: dx/dt = -k1 (y) dy/dt = k2 x k1= 10 k2= 10 These are the conditions: x(0)= 100 y(0) = 0 I am so confused...This is what I have done so far...but is not making any sense... x= (dy/dt) (1/k2) Substitute in: d2y/dt2 = -100 y So the solution is...

cos a -sin a sin a cos a How do I find the eigenvalue of this rotation matrix? I did the usual way, but didn't work! Could someone tell me how to start this problem?

Homework Statement Can entropy change be zero for a closed system in an irreversible process? If yes under what conditions? Thanks! Homework Equations The Attempt at a Solution

Can entropy change be zero for a closed system in an irreversible process? If yes under what conditions? Thanks!

Can entropy change be zero for a closed system in an irreversible process? If yes under what conditions? Thanks! Is it ture that it would be zero in an adiabatic, process carried in consant temperature?

Is it true that entropy change for the irreversible process would be zero for an adiabatic process carried out in constant temperature?

Can entropy change be zero for a closed system in an irreversible process? If yes under what conditions? Thanks!