1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Thermal expansion in heat engine

  1. Nov 11, 2008 #1
    A brass piston of diameter 25 cm at 20 degrees C must be able to function at 150 degrees C.
    In order to do so it must fit inside a steel cylidrical chamber. What must the minimum initial diameter of the cylinder be so that the piston never rubs against it.
    alpha=2x10^-5 for brass
    alpha=1.2x10^-5 for steel
    dT=130 degrees C


    I don't know whether this is Volume or linear thermal expansion. I think it is volume but there is no given value for length of the piston or cylinder so initial volume and delta V are unknown.
  2. jcsd
  3. Nov 12, 2008 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Hint: diameter is a linear dimension quantity.

    p.s. welcome to PF.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook