Please explain this entropy change formula for me?

AI Thread Summary
The discussion revolves around calculating the entropy change of a lake when a 2.00 kg aluminum bar at 300°C is submerged in it, with the lake's temperature at 15.0°C. The specific heat capacity of aluminum is given as 900 J/(kg*K). The problem assumes that the lake's temperature remains constant due to its large size. The user initially seeks clarification on the entropy change formula but later indicates they have resolved the issue independently. The focus is on understanding the entropy change in thermal equilibrium scenarios.
jaded18
Messages
149
Reaction score
0
[SOLVED] please explain this entropy change formula for me??

An aluminum bar of mass 2.00 kg at 300 Celsius is thrown into a lake. The temperature of the water in the lake is 15.0Celsius; the specific heat capacity of aluminum is 900 J/(kg*K).
The bar eventually reaches thermal equilibrium with the lake. What is the entropy change DeltaS_lake of the lake? Assume that the lake is so large that its temperature remains virtually constant.
 
Physics news on Phys.org
nvm i got it
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Trying to understand the logic behind adding vectors with an angle between them'

Thread 'Trying to understand the logic behind adding vectors with an angle between them'

My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h. So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...
View full post »

Similar threads

Calculating Entropy Change in a Lead-Lake System
Replies
4
Views
3K
Calculating Entropy Change of Lake from Thrown Aluminum Bar
Replies
1
Views
10K
Calculate change in entropy per minute.
Replies
4
Views
1K
Change in temperature for a system with entropy change
Replies
4
Views
2K
Change in Entropy When Mixing Water at Different Temperatures
Replies
5
Views
1K
Proving Entropy statement is equivalent to Clausius statement
Replies
2
Views
1K
Entropy and Carnot refrigerators
Replies
20
Views
3K
Change in entropy of the universe due to some block being lifted
Replies
2
Views
3K
Entropy and the Laws of Thermodynamics
Replies
3
Views
2K
Finding Initial Temperature Entropy and Heat Exchange
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top