Calculating Temperature Change of Steel Strut in Submarine

Click For Summary

Homework Help Overview

The discussion revolves around calculating the temperature change of a steel strut in a submarine after absorbing a specific amount of energy. The problem involves concepts from thermodynamics and material properties, specifically focusing on the relationship between energy, mass, and temperature change.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the formula for temperature change and the need to determine the mass of the steel strut. Questions arise regarding how to calculate mass using the given density and dimensions of the strut.

Discussion Status

Some participants have provided guidance on calculating the mass using the cross-sectional area and length of the strut. There is an ongoing exploration of the correct formulas and relationships between the variables involved. Multiple interpretations of the problem are being discussed, with some participants clarifying the necessary calculations.

Contextual Notes

The problem is constrained by the specific dimensions and properties of the steel strut, as well as the energy absorbed. Participants are working within the framework of the provided information and equations without reaching a final consensus on the solution.

BunDa4Th
Messages
188
Reaction score
0

Homework Statement



Suppose a steel strut with cross-sectional area 7.00x10^-4 m2 and length 2.50 m is bolted between two rigid bulkheads in the engine room of a submarine.
(a) Calculate the change in temperature of the strut if it absorbs an energy of 3.00x10^5 J. °C

Homework Equations



Q = mcDeltaT
DeltaT = Q/mc

The Attempt at a Solution



I tried using the formula DeltaT = Q/mc

Delta T = 3.00 x 10^5/ m(448 J/kg *C)

the problem I am having is how do i find the mass?
 
Physics news on Phys.org
Density of steel \rho _{steel} = 7.8 \times 10^3\ kg/m^3
 
I still don't understand how to solve this problem knowing the density of steel.
 
Use it to find the mass of the steel.
 
m = psteelV

how do i find v?
 
Last edited:
No. You are given the cross sectional area and the length. Do you know how to calculate the volume from this information?
 
okay i figure out how to solve this.

it was P_steel x cross sec. area / length = m
 
Not quite: V=A*l (where A is the cross sec. area, l is the length). Above you had the correct formula: m= ρ*V and so m= ρ*A*l
 
oops, my mistake. yes i did mean m = p x A x l that was how i got the correct answer.

Thanks for the correction and help.
 

Similar threads

  • · Replies 16 ·
Replies
16
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 5 ·
Replies
5
Views
6K
  • · Replies 2 ·
Replies
2
Views
1K
Replies
1
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
1
Views
2K