Specific Heat Capacity and Energy

AI Thread Summary
The discussion revolves around a homework question related to specific heat capacity and energy calculations. A participant expresses confusion regarding the formula for energy needed, questioning how power divided by the rate of reduction leads to the correct units. They initially misinterpret the units, thinking it results in J/kg, which would imply specific heat capacity rather than energy. Ultimately, they clarify that since the mass is 1 kg, the units simplify correctly to joules. This highlights the importance of unit analysis in physics problems involving energy and specific heat capacity.
Mukilab
Messages
73
Reaction score
0

Homework Statement



http://www.physics.ox.ac.uk/olympiad/Downloads/PastPapers/BPhO_PC_2006_QP.pdf

Q15b

Answers:
http://www.physics.ox.ac.uk/olympiad/Downloads/PastPapers/BPhO_PC_2006_MS.pdf

I am confused on how the answer is reached, specifically how the formula energy needed=power/rate of reduction is laid out

Homework Equations



energy needed = power/rate of reduction

The Attempt at a Solution



What I am confused about is that since power is in J/s and rate of reduction is in kg/s that would make Energy needed into J/kg... or specific heat capacity and not energy itself.

How does this work?
 
Physics news on Phys.org
Nevermind I realized that since the kg is 1, j/kg gives joules anyway
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »

Similar threads

Calculating Specific Heat Capacity
Replies
6
Views
2K
I try to solve a thermodynamics problem on heat transfer
Replies
3
Views
2K
Specific heat capacity of a solid material
Replies
9
Views
2K
Calorimetry - finding the final temperature of a system of ice and water
Replies
7
Views
2K
Specific heat capacity, Q = mcθ
Replies
3
Views
3K
How much ice to cool down this water?
Replies
17
Views
5K
Determining the specific heat capacity of water
Replies
7
Views
2K
Find the mass of a metal block with heat capacity 60JK
Replies
5
Views
2K
Why Is My Calculation of Heat Energy Incorrect?
Replies
3
Views
2K
How Do You Calculate the Specific Latent Heat of Fusion of Nitrogen?
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top