negative Delta U


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BAlvarado_1L
Posts: 49
Joined: Thu Jul 25, 2019 12:16 am

negative Delta U

Postby BAlvarado_1L » Fri Feb 07, 2020 6:06 am

if you burn fuel what does it mean conceptually for the Delta U to be negative? can the system then not do work?

Connie Chen 1E
Posts: 51
Joined: Mon Jun 17, 2019 7:24 am

Re: negative Delta U

Postby Connie Chen 1E » Fri Feb 07, 2020 9:55 am

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.

Fatemah Yacoub 1F
Posts: 114
Joined: Thu Jul 11, 2019 12:16 am

Re: negative Delta U

Postby Fatemah Yacoub 1F » Fri Feb 07, 2020 10:28 am

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.

805307623
Posts: 99
Joined: Fri Aug 09, 2019 12:17 am

Re: negative Delta U

Postby 805307623 » Fri Feb 07, 2020 10:46 am

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.

Leslie Almaraz 4G
Posts: 99
Joined: Fri Aug 02, 2019 12:16 am

Re: negative Delta U

Postby Leslie Almaraz 4G » Fri Feb 07, 2020 5:52 pm

are there any other cases where the change in internal energy will be negative?

Rebekah Alfred 1J
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am
Been upvoted: 1 time

Re: negative Delta U

Postby Rebekah Alfred 1J » Fri Feb 07, 2020 7:17 pm

A negative delta U occurs when the final internal energy is lower than the initial internal energy.


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