Finding temperature after something falls

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Homework Help Overview

The discussion revolves around calculating the final temperature of a 1.0 kg lead object after it falls a distance of 200 m. The specific heat of lead is provided, and the initial temperature is stated as 300 K. Participants are exploring the implications of energy transfer during the fall.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to apply the equation mc(Tf - Ti) = mgy to find the final temperature. There is a discussion about the use of initial temperature in calculations, with one participant questioning the choice of values.

Discussion Status

Some participants have provided calculations leading to different temperature results, indicating a divergence in approaches. There is no explicit consensus on the correct final temperature, and the discussion includes clarifications and questions about the methodology used.

Contextual Notes

Participants are working within the constraints of a homework assignment, and there is mention of a potential issue with marking the thread as solved, suggesting a focus on collaborative problem-solving rather than finalizing answers.

crazyog
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Homework Statement


What is the temperature in K of 1.0 kg of lead initially at 300 K after it falls 200 m? The specific heat of lead is 128 J/kg C.
a) 307 b) 311 c) 315 d)275 e) 279
the answer my teacher said was c but i keep getting a.


Homework Equations


I thought I would use mc (Tf-Ti) = mgy

The Attempt at a Solution


The masses cross out. so
(300)(delta T) = (9.8)(200)
I get delta T = 6.53
300 +6.53 = 306.53
 
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crazyog said:
I thought I would use mc (Tf-Ti) = mgy

The Attempt at a Solution


The masses cross out. so
(300)(delta T) = (9.8)(200)

Hi crazyog! :smile:

erm … why are you using 300 for c? :wink:
 
(1kg)(128) (Tf - 300) = (1 kg) (9.8) (200 m)
128Tf - 38400 = 1960
Tf = 315.31
thank you! :)ehh, how do I mark this solved?
 
Last edited:
crazyog said:
ehh, how do I mark this solved?

Hi crazyog! :smile:

I think the "SOLVED" facility got lost in the recent upgrade.

Maybe it'll come back! :rolleyes:
 

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