Week 14 HW - thermal properties
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MSE 23000 Homework Assignment – Week 13 (10 pts)
Thermal Properties Over the next week, think about the following problems and provide your responses as prompted below using this
document as a template
. Responses can be typed and/or inserted as scans or images (
e.g.
, of hand-written calculations or sketches). These questions are reflective of typical exam questions – hence, the students who complete their homework assignments are the best prepared for their upcoming exams. Additionally, you are encouraged to attempt all homework problems before attending your weekly recitation
so that you are prepared to ask questions and seek guidance & hints from your recitation instructor. This assignment is worth 10 points and will be graded for completion only. Submit your assignment as a single PDF document
by using the appropriate link on Brightspace.
(2 pts) 1. Callister 19.1: Estimate the energy required to raise the temperature of 6 kg of the following materials from 40 to 200°C: aluminum, steel, soda-lime glass, and high-density polyethylene. (1 pt) 2. Callister 19.7: An aluminum wire 20 m long is cooled from 30 to -6°C. How much change in length will it experience?
(1 pt) 3. Callister 19.9: Briefly explain thermal expansion using the potential-energy-versus-interatomic-spacing
curve.
(4 pts) 4. Callister 19.14: Multi-step problem about Thermal Conductivity
a)
Calculate the heat flux through a sheet of steel 10 mm thick if the temperatures of the two faces of the sheet are 400 and 200°C; assume steady-state heat flow.
b)
What is the heat loss per hour if the area of the sheet is 0.55 m
2
?
c)
What will be the heat loss per hour if soda-lime glass is used instead of steel?
d)
Calculate the heat loss per hour if steel is used and the thickness is increased to 60 mm.
(2 pts) 5. Callister 19.D1: Railroad tracks made of 1025 steel are to be laid during the time of year when the temperature averages 10°C (50°F). If a joint space of 8.7 mm is allowed between the standard 13.5-m long steel
rails, what is the hottest possible temperature than can be tolerated without the introduction of thermal stresses?
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