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A change in a system occurs such that 87.5 of heat flows out of the system and 73.8 J of work is done by the system: What is the change in internal energy of the sy...

Question

A change in a system occurs such that 87.5 of heat flows out of the system and 73.8 J of work is done by the system: What is the change in internal energy of the system?a, -73.8 Jb. -161.3 J-87.5 J13.7 J-13.7 J

A change in a system occurs such that 87.5 of heat flows out of the system and 73.8 J of work is done by the system: What is the change in internal energy of the system? a, -73.8 J b. -161.3 J -87.5 J 13.7 J -13.7 J



Answers

What is the change in internal energy of a system if the surroundings (a) transfer $235 \mathrm{J}$ of heat and $128 \mathrm{J}$ of work to the system; (b) absorb $145 \mathrm{J}$ of heat from the system while doing $98 \mathrm{J}$ of work on the system; (c) exchange no heat, but receive $1.07 \mathrm{k}$ ] of work from the system?

He was probably gonna determine you changing internal energy, giving different amounts of heat and work. And we're gonna use this a presion that says that you the change of internal energy is a fortune meat plus sport. And for the first case, we have that 58 jewels of heat is absorbed, so that's gonna be positive. And then we also have that 50 jewels of work is done, and that's gonna be negative. Well, these two were gonna cancel out doing Austin's year old jewels for the change in internal energy report be we have that 125 jewels of heat is absorbed, so that's gonna be positive, increasing the internal energy. Then we have 687 jewels, jewels of work being done, and that's again, it's gonna be negative. So if we should track those, we get negative by 62 jewels for our internal energy. In her part C. We're not to do some converting here because the heat and work is given are given in different units. So we have our heat. Being a role is in calories, Mia. That's gonna be negative. 280 calories. Now we can convert that to Jules to make this easier. So a multiplier lot by 4.18 for Jules, which is equals with one calorie. So we're gonna happen Mega Dio 11. 71.5 to your jewels, and then the work is being done Work on the system, so that's gonna make it positive, But it's given in college rules, so we can just convert that Jules yet? Well, 50 jewels. And then if we add those two together, our change and internal energy is going to be a 78.48 jewels.

Okay, So for this problem, we're going to find what the change of internal energy is in a system. And this is done by using one simple formula, which is don't, uh, tell to you equals Q plus W where w is the work done on the system and que is the heat taken by this system. And for this problem, we are given what Q equals and what w equals. And we're told that q equals 550 Jules and that w equals negative 800 40 Jules. Therefore, if we just plugged this all in to the formula we get dealt to you equals Q plus W so tell to you equals 550 plus negative 8 40 This is where we would distribute the plus into the minus. Therefore, we get 550 in minus 8 40 all in jewels. And then when we do the subtraction, we get that the change in the energy that change in internal energy of the system equals negative 290 jewels, which is the answer for this problem

So it is no longer given the heat absorbed by the system is equal to 550 john and wooden by the system is equal to 840 Joel. And we have to find the change in internal energy of the system. For that purpose it will use is from the first law of thermodynamics we know that heat absorb must be equal to changing internal energy less. Who wouldn? So when we were in this equation we get genuine energies got to heat absorbed minus w. So we will subside. The given values sq is 550, Joel -Werder is accurate. 40. So when we saw this, we get change. The internally of the system is equal to -290 John which is the answer to this question. And here the minus sign shows that the internally of the system has decreased.

Hello students in this question. In a process, the heat absorbed. That is cute. It is equal to 7.701 jewel. And it is absorbed. So it will be taken as positive. And the work is done by the system. So w It is equal to minus 3 94 jewels as the system is doing work. So it is negative. So we have to determine the changing internal energy for this system. So from the thermodynamics, first law we can write that changing internal energy delta. Q. Delta. You, it is equal to Q plus W. Okay, so Q. Which is equals two plus +701 jewel. And W. Which is equal to -394 June. So from here the change in internal energy delta you. It is equal to 307 June. Okay, so this is the changing internal energy for this process. So this becomes the answer for this problem. Okay, so using first law of thermodynamics, we can determine any think from these three quantities. Okay, so you have to just simply remember these signed conventions. Okay, thank you.


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