What's the Correct Temperature of the Bolt Before Placing in Water?

  • Thread starter Thread starter Mr.Helms
  • Start date Start date
Mr.Helms
Messages
3
Reaction score
0
An aluminum bolt has a mass of 21.3 g. It is heated then placed into 839 g of water in a copper calorimeter cup with a mass of 137 g. The initial temperature of the water and the copper cup is 16 oC. The bolt, water and cup arive at an equilibrium temperature of 18.4 oC. What was the temperature in degrees celcius of the bolt before it was placed in the water?

I used this formula and got wrong answer, need help.

Tf = (m1C1T1 + m2C2T2) / (m1C1 + m2C2)

And got 541.3 Degrees C. What is wrong.?
 
Physics news on Phys.org
The first thing that pops out to me is that you have three masses exchanging heat, but your equation only accounts for two of them...
 
Where does this formula come from? and what do the variables mean?
Can you show more work? What did you plugged in for the various variables?
 
Why is this in the advanced forum?
 

Thread 'Initial conditions for orbits around a wormhole'

Hi, I had an exam and I completely messed up a problem. Especially one part which was necessary for the rest of the problem. Basically, I have a wormhole metric: $$(ds)^2 = -(dt)^2 + (dr)^2 + (r^2 + b^2)( (d\theta)^2 + sin^2 \theta (d\phi)^2 )$$ Where ##b=1## with an orbit only in the equatorial plane. We also know from the question that the orbit must satisfy this relationship: $$\varepsilon = \frac{1}{2} (\frac{dr}{d\tau})^2 + V_{eff}(r)$$ Ultimately, I was tasked to find the initial...
View full post »

Thread 'Help to convert units of a simple formula'

The value of H equals ## 10^{3}## in natural units, According to : https://en.wikipedia.org/wiki/Natural_units, ## t \sim 10^{-21} sec = 10^{21} Hz ##, and since ## \text{GeV} \sim 10^{24} \text{Hz } ##, ## GeV \sim 10^{24} \times 10^{-21} = 10^3 ## in natural units. So is this conversion correct? Also in the above formula, can I convert H to that natural units , since it’s a constant, while keeping k in Hz ?
View full post »

Similar threads

What is the initial temperature of the heated aluminum bolt?
Replies
4
Views
2K
What Is the Final Temperature When Ice and Water Mix?
Replies
8
Views
5K
Equilibrium Temperature with three substances
Replies
3
Views
2K
What is the change in entropy when mixing water and alcohol?
Replies
2
Views
3K
Specific heat capacity of calorimeter
Replies
6
Views
3K
Final Temperature of Copper and Water in Insulated Vessel
Replies
3
Views
2K
Specific Heat Question: Calculating Temperature Change with Copper and Water
Replies
2
Views
1K
Experimenting whether the diameter of a pot affects boiling time for water
Replies
15
Views
2K
Calculating final temperature in insulated container
Replies
1
Views
2K
Grade 11 physic problem; calculating heat transfers?
Replies
2
Views
6K

Hot Threads

Recent Insights

Back
Top