Test 1 Question

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604807557
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Test 1 Question

Postby 604807557 » Sun Feb 04, 2018 11:17 pm

Why is "The contents of an ideal cooler at 3 degrees C" an isolated system and not closed?

Nicole Nikolov 1K
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Re: Test 1 Question

Postby Nicole Nikolov 1K » Sun Feb 04, 2018 11:20 pm

This is an isolated system because the whole point of a cooler is to keep the contents inside cold. Therefore, no heat/energy is being exchanged between the inside and the outside. An "ideal" cooler would 100% prevent the flow of heat between the system and the surroundings.

Shane Simon 2K
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Re: Test 1 Question

Postby Shane Simon 2K » Sun Feb 04, 2018 11:21 pm

An ideal cooler is not a closed system because coolers keep drinks cold. This means that heat is not exchanged with its surroundings. Isolated systems do not exchange heat with their surroundings while closed systems do. If you thought it was closed because coolers are not always 100% effective and heat is always still exchanged a little, it is still isolated because the question states an "ideal" cooler which means it will not allow its contents to get cold (and transfer heat with the surroundings).

Mitch Mologne 1A
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Re: Test 1 Question

Postby Mitch Mologne 1A » Sun Feb 04, 2018 11:22 pm

An isolated system just means that energy can not be released/gained in the system. That does not mean that there can't be energy already in the system, and in this case, that energy is in the form of heat.

Abigail Yap 2K
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Re: Test 1 Question

Postby Abigail Yap 2K » Sun Feb 04, 2018 11:24 pm

Hi,

The system is isolated because the question states that the cooler is "ideal." An IDEAL cooler would be perfectly insulated and would not exchange any matter or energy with its surroundings (we would not find such a cooler in the real world).


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