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negative Delta U

Posted: Fri Feb 07, 2020 6:06 am
by BAlvarado_1L
if you burn fuel what does it mean conceptually for the Delta U to be negative? can the system then not do work?

Re: negative Delta U

Posted: Fri Feb 07, 2020 9:55 am
by Connie Chen 1E
Internal energy is the total store of energy in a system. When you burn fuel, that energy is released, so the final internal energy of the system will be less than the initial, resulting in a negative delta U.

Re: negative Delta U

Posted: Fri Feb 07, 2020 10:28 am
by Fatemah Yacoub 1F
If you burn fuel you have a lot of heat lost, meaning the internal energy decrease, but since the energy is lost as heat it does not increase the capacity to do work.

Re: negative Delta U

Posted: Fri Feb 07, 2020 10:46 am
by 805307623
If the temp of the gas decreases, the gas molecules slow down, and the internal energy of the gas decreases. This means that ΔU is negative.

Re: negative Delta U

Posted: Fri Feb 07, 2020 5:52 pm
by Leslie Almaraz 4G
are there any other cases where the change in internal energy will be negative?

Re: negative Delta U

Posted: Fri Feb 07, 2020 7:17 pm
by Rebekah Alfred 1J
A negative delta U occurs when the final internal energy is lower than the initial internal energy.