What is the final temperature of a lead ball dropped from a height of 4.57 m?

  • Thread starter Thread starter Silverbolt
  • Start date Start date
  • Tags Tags
    Energy Thermal
Click For Summary
To find the final temperature of a 97.6-g lead ball dropped from 4.57 m, the potential energy (P.E.) is calculated using the formula P.E. = mgh, resulting in 4.371 J. This energy is assumed to convert entirely into heat, which is expressed using the equation Q = mcΔT. The user sets up the equation 4.371 J = (0.0976 kg)(128 J/kg°C)(Tf - 20°C) to solve for the final temperature (Tf). The discussion emphasizes the importance of following forum rules and providing initial attempts for assistance. The method outlined is correct and should yield the desired final temperature.
Silverbolt
Messages
24
Reaction score
0
A 97.6-g lead ball with an initial temperature of 20°C, is dropped from rest from a height of 4.57 m. The collision between the ball and ground is totally inelastic. Assuming all the ball's kinetic energy goes into heating the ball, find its final temperature.

PLEASE HELP ME UNDERSTAND THIS PROBLEM STEP-BY-STEP
 
Physics news on Phys.org
Silverbolt said:
A 97.6-g lead ball with an initial temperature of 20°C, is dropped from rest from a height of 4.57 m. The collision between the ball and ground is totally inelastic. Assuming all the ball's kinetic energy goes into heating the ball, find its final temperature.

PLEASE HELP ME UNDERSTAND THIS PROBLEM STEP-BY-STEP

You'll have to re-read the forum rules. You need to follow the posting template and provide an attempt so that we can know how to help you; we cannot provide answers or do your homework for you.
 
This is what I think I would do:
So I would us the potential energy equation: P.E.=mgh
so --> P.E.= (.0976 kg)(9.8m/s^2)( 4.57m)
P.E. = 4.371J

With this I'll use the equation: Q=mcT

4.371J =(.0976kg)(128 J/Kg(°C) )( Tf-20°C)

Ans so I'll solve for TfSO IS THIS RIGHT?? PLEASE HELP
 
Silverbolt said:
This is what I think I would do:
So I would us the potential energy equation: P.E.=mgh
so --> P.E.= (.0976 kg)(9.8m/s^2)( 4.57m)
P.E. = 4.371J

With this I'll use the equation: Q=mcT

4.371J =(.0976kg)(128 J/Kg(°C) )( Tf-20°C)

Ans so I'll solve for Tf


SO IS THIS RIGHT?? PLEASE HELP
That should work.
 
Thanx!
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

Similar threads

Replies
7
Views
3K
Replies
34
Views
2K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 4 ·
Replies
4
Views
6K
  • · Replies 13 ·
Replies
13
Views
8K