## Test question [ENDORSED]

$\Delta U=q+w$

mayapartha_1D
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Test question

On the test where we were supposed to state the First Law of Thermodynamics, how specific were we supposed to get with the definition?

Thanks!

Julian Krzysiak 2K
Posts: 49
Joined: Fri Sep 29, 2017 7:07 am

### Re: Test question

I put that the First Law of Thermodynamics states that the internal energy of an isolated system will not change. I also put $\left ( \Delta U=q+w \right )$ just in case. Hopefully that's specific enough.

Belle Calforda3f
Posts: 67
Joined: Fri Sep 29, 2017 7:07 am

### Re: Test question

The first law of thermodynamics is essentially the law of conservation of mass: matter is neither created nor destroyed. However it is super important to know that as stated by the first law of thermodynamics, the total energy of an isolated system is constant

Ilan Shavolian 1K
Posts: 58
Joined: Fri Sep 29, 2017 7:03 am

### Re: Test question

I said that energy cannot be created or destroyed, so i think if you said something along those lines you'll be fine. I also put the equation deltaU = q + w

Chris Pleman 3E
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Joined: Thu Jul 27, 2017 3:01 am
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### Re: Test question

I also put the equation (delta)E(univ)= (delta)E(sys) + (delta)E(surroundings), but I'm not sure if that was redundant in lieu of stating that matter and energy are neither created nor destroyed.

604807557
Posts: 51
Joined: Wed Nov 16, 2016 3:02 am

### Re: Test question

The question was pretty vague so I was also wondering how specific we were supposed to be because all I answered was that "Energy can't be created or destroyed, conservation of energy."

Ramya Lakkaraju 1B
Posts: 67
Joined: Fri Sep 29, 2017 7:03 am

### Re: Test question

I just wrote the equation, delta U = q + w.

Tim Nguyen 2J
Posts: 31
Joined: Sat Jul 22, 2017 3:00 am

### Re: Test question

Along with the equation, I also just stated that energy can neither be created nor destroyed, just transferred in various forms.

Jennie Fox 1D
Posts: 66
Joined: Sat Jul 22, 2017 3:01 am

### Re: Test question

I stated that energy cannot be created nor destroyed, only transferred. I'm pretty sure that is all they would be looking for, because the First Law of Conservation is primarily concerned with the conservation of energy.

Tatiana Hage 2E
Posts: 51
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Been upvoted: 2 times

### Re: Test question

The textbook says the first law of thermodynamics is that the internal energy of an isolated system is constant, so I think that would be sufficient.

Michelle Steinberg2J
Posts: 73
Joined: Fri Sep 29, 2017 7:04 am

### Re: Test question

Ramya Lakkaraju 1B wrote:I just wrote the equation, delta U = q + w.

I also just wrote this equation. I honestly didn't even think to do any explaining. Hopefully that was sufficient!

Sarah Wax 1G
Posts: 29
Joined: Sat Jul 22, 2017 3:00 am

### Re: Test question

Yeah, I basically just put "energy can be neither created nor destroyed, only conserved." My TA told me that as long as you understood the concept, they didn't dock you for not being 100% accurate.

904940852
Posts: 53
Joined: Fri Sep 29, 2017 7:07 am

### Re: Test question

Energy can not be created nor destroyed

Diane Bui 2J
Posts: 61
Joined: Sat Jul 22, 2017 3:00 am

### Re: Test question

I also wrote that the internal energy of an isolated system remains constant.

Kyung_Jin_Kim_1H
Posts: 53
Joined: Thu Jul 27, 2017 3:00 am

### Re: Test question

Conservation of energy in the universe.

(I didn't even think of elaborating...)

Wenjie Dong 2E
Posts: 53
Joined: Fri Jun 23, 2017 11:40 am

### Re: Test question  [ENDORSED]

Kyung_Jin_Kim_1H wrote:Conservation of energy in the universe.

(I didn't even think of elaborating...)

Same.

Patricia Macalalag 2E
Posts: 53
Joined: Sat Jul 22, 2017 3:00 am

### Re: Test question

They accepted multiple answers. Mine was "energy cannot be created or destroyed; it must be exchanged."

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